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Article

The Influence of the Type of Cement on the Properties of Surface Cement Concrete

by
Tomasz Rudnicki
Faculty of Civil Engineering and Geodesy, Military University of Technology, 2 Kaliskiego St., 00-908 Warsaw, Poland
Materials 2022, 15(14), 4998; https://doi.org/10.3390/ma15144998
Submission received: 22 May 2022 / Revised: 27 June 2022 / Accepted: 15 July 2022 / Published: 18 July 2022
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Abstract

:
The aim of this work was to reduce the carbon footprint of cement concrete by using multi-component cement with a high content of blast furnace slag. The analysis consisted of comparing the properties of the concrete mix and the hardened concrete made of the CEM I 42.5 R-NA cement commonly used in Poland and the CEM III cement with a large amount of blast furnace slag. The tests used cement in a constant amount of 380 kg/m3, granite aggregate of 2/8, 8/16, 16/22 mm and sand of 0/2 mm. As part of this project, detailed tests of the concrete mix and hardened concrete were carried out in terms of compressive, bending, fracture and frost resistance after 150 cycles of freezing and thawing, and the pore structure in hardened concrete was assessed according to PN-EN 480-11. The endurance tests were performed after 7, 28 and 90 days. On the basis of the obtained results, it was found that the highest compressive strengths above 70.2 MPa were obtained for concrete with CEM III, 64.5 MPa for concrete with CEM I. Additionally, for concrete with multi-component cement, smaller drops in compressive strength were obtained and a more favorable pore distribution in hardened concrete was obtained. Concrete intended for road surfaces can be made of both CEM I and CEM III cement, as they meet the requirements of the technical specifications for roads with heavy traffic of heavy vehicles.

1. Introduction

The economic development of any country depends largely on a well-developed road network. The construction of such infrastructure consumes a very large part of the expenditure of each country; therefore, it is extremely important to increase the durability of the roads built in order to reduce maintenance costs in the future and maximize the life cycle of the pavement. A reduction in maintenance costs and an extension of the life cycle of road pavements is possible thanks to the use of cement concrete pavements. In Poland, the most frequently used cement for infrastructure is Portland cement CEM I 42.5, but its production requires a lot of energy, as it contains over 90% of clinker. The activities of many researchers in the field of the properties of cement concrete mainly concerned the modification of the concrete composition through the use of various types of aggregate, the amount and type of chemical admixtures and mineral additives [1,2,3,4,5,6,7,8,9]. A reduction in CO2 emissions in cement concrete is most effective by using cements with the lowest possible amount of clinker [10,11,12,13,14,15,16,17]. Such a cement is CEM III, which contains 40% of clinker and 50% of blast furnace slag which is industrial waste and can significantly reduce the carbon footprint of concrete. An additional argument that strengthens the use of multi-component binders in the infrastructure of cements is a significant reduction in the possibility of an alkaline reaction in concrete. By analyzing the literature, one can see the works on the use of processed mineral waste or industrial waste [18,19,20,21,22,23,24,25,26]. A very important element of increasing the durability of concrete is to obtain the proper aeration structure through the use of air-entraining admixtures [27,28,29,30]. The tests of the concrete pavement of the A6 motorway after 80 years of operation confirmed that the tested concrete pavement is very durable, and its compressive strength parameters exceed 60 MPa [31], and the strength tests, such as frost resistance after 150 cycles and the analysis of the strength of the aeration structure meet today’s very high requirements [32,33,34,35,36]. Thanks to the optimization of the concrete mix composition in terms of the aggregates used and new solutions of chemical admixtures, we can obtain concrete surfaces with very high properties [37]. The use of admixtures reducing the amount of water and increasing the plasticity of the mix, allows for the extension of the technological process of transport and incorporation of the concrete mix by up to 2 h while maintaining the required parameters of the concrete mix during assembly [38,39,40]. The conducted tests of concrete in the field of frost resistance confirm that a well-selected air-entraining admixture is able to create an appropriate structure of air pore distribution, guaranteeing durability that exceeds the requirements for concrete surfaces [41,42,43,44]. When analyzing the life cycle of a concrete pavement, it should be emphasized that after exceeding the full service life, pavement concrete can be 100% recycled and rebuilt in the whitetopping technology [45].

2. Materials and Methods

2.1. Materials

The tests were carried out with the use of two types of cements according to PN-EN 197-1 [46], cement CEM I 42.5 R-NA and CEM III/A 42.5 HSR-NA, granite aggregate 2/8, 8/16 and 16/22, density 2.65 g/cm3 and water absorption 0.80% and natural sand with a fraction of 0/2 with a density of 2.64 g/cm3. Two types of chemical admixtures were used in the form of a high-performance/strong admixture reducing water SP of the 3rd generation, in accordance with the PN-EN 934-1 [47] and PN-EN 934-2 [48] standards, a modified high-performance polycarboxylic admixture reducing liquid water with a density of 1.02 g/cm3 and an aerator with a density of 1.01 g/cm3 and water in accordance with the requirements of PN-EN 1008 [49]. The properties and design of the cements supplied by the manufacturer are shown in Table 1 and Figure 1.
CEM I 42.5 R-NA contains more than 90% of Portland clinker (K), which is produced by sintering a precisely defined mixture of raw materials (raw meal, paste or slurry) containing elements, usually expressed as oxides, CaO, SiO2, Al2O3, Fe2O3 and small amounts of other materials. The raw meal, paste or slurry are finely ground, thoroughly mixed and therefore homogeneous. Portland cement clinker is a hydraulic material, at least two-thirds of its mass is composed of calcium silicates (3CaO SiO2 and 2CaO SiO2) and the remainder of aluminum and iron containing clinker phases and other compounds. The mass ratio (CaO)/(SiO2) must not be less than 2.0 [49]. The content of magnesium oxide (MgO) shall not exceed 5.0% (m/m). CEM III/A 42.5 HSR-NA contains more than 50% of granular blast furnace slag (S). Granular blast furnace slag is produced by rapidly cooling molten slag which has a suitable composition obtained by smelting iron ore in a blast furnace, and at least two-thirds of the mass of which is vitreous slag, and which has hydraulic properties when suitably activated. Granular blast furnace slag consists of at least two-thirds, in terms of mass, of the sum of calcium oxide (CaO), magnesium oxide (MgO) and silicon dioxide (SiO2). The remainder contains aluminum oxide (Al2O3) along with a small amount of other compounds. The mass ratio (CaO + MgO)/(SiO2) should exceed 1.0 [49].

2.2. Methods

The tests of the concrete mix, including the determination of air content, density, the temperature of the mix and consistency, were carried out 5 and 60 min after the completion of mixing the components in order to check the rheological behavior of the concrete mix. The vebe consistency tests were carried out in accordance with EN 12350-2 [50], the air content was determined by the pressure method in accordance with EN 12350-7 [51], and the density of the concrete mixture was determined in accordance with the EN 12350-6 [52] standard. The requirements for the concrete pavement used for the design and determination of concrete properties contained in the detailed technical specification are presented in Table 2 below:
C35/45 class concrete with a w/c coefficient of 0.40 was designed with the use of a plasticizing admixture and an air-entraining admixture. All tested concretes were made with a constant amount of cement of 380 kg/m3. Granite aggregate with a fraction of 2/8, 8/16 and 16/22 mm and natural sand with a fraction of 0/2 mm of the grain size are shown in Table 3.
The grading of the mineral mix along with the recommended grading curves resulting from the requirements of the technical specification are presented in Figure 2 below:
The assumptions of the research project were to determine the properties of concrete mix and hardened concrete after 7, 28 and 90 days of curing in accordance with the guidelines for using two different cements intended for use in road concrete surfaces with high traffic. The list of the compositions of the tested concrete mixtures is presented in Table 4:
The forming and storage of samples during maturation were performed in accordance with the requirements of EN 12390-2 [53]. Tests of hardened concrete in terms of determining the compressive strength, flexural strength and tensile strength were carried out in accordance with PN-EN 12390-3 [54], PN-EN 12390-6 [55], PN-EN 12390-5 [56] after 7, 28 and 90 days of maturation.
The main research element of this project was to verify the frost resistance after 150 cycles analyzed with the use of the standard method in accordance with PN-B-06250: 1988 [57] and for each series the pore distribution in hardened concrete was determined in accordance with EN 480-11 [58]. In total, more than 160 samples were prepared and tested.

3. Results

3.1. Assessment of Concrete Mix Properties

The influence of the type of cement on the properties of the concrete mix was determined 5 and 60 min after mixing the components under standard conditions. The consistency was determined in accordance with PN-EN 12350-3, the air content in the concrete mix in accordance with PN-EN 12350-7 and the density of the mix in accordance with PN-EN 12350-6. The results obtained during this study are summarized in Table 5:
Analyzing the obtained results of the consistency determination after 5 and 60 min, it can be seen that the highest parameters were obtained for the C_III concrete mix based on the CEM III cement. The concrete mix for CEM III tested after 60 min maintained the assumed consistency and air content. For the C_I mix based on CEM I, the consistency ranged from 14 s to 10 s after 60 min, and the air content from 5.8% to 5.1% after 60 min. All results were within the parameters’ range required by the specification.

3.2. Determination of the Compressive Strength of Concrete

The effect of the type of cement on the compressive strength was determined according to PN-EN 12390-3 after 7, 28 and 90 days of maturation. The production and storage of 36 samples during the maturation period was carried out in accordance with the requirements of EN 12390-2. The average results of the obtained tests are summarized in Table 6 and Figure 3:
When analyzing the obtained results of the compressive strength test, it should be noted that the highest values were obtained for C_III concrete based on CEM III after 28 and 90 days of maturation. Concrete C_I obtained higher strength after 7 days because it is made of CEM I 42.5 R-NA cement, i.e., with early compressive strength. Regardless of the type of cement, all concretes reached the minimum of 49 MPa required by the specifications. Concrete based on CEM III cement reached 44.5, 60.3 and 70.2 MPa, respectively, after 7, 28 and 90 days of maturation. For CEM I cement, the obtained results were lower by 4.8% and 8.1% after 28 and 90 days compared to CEM III. Greater strength and greater increases in strength of concrete based on CEM III cement result from the greater amount of mineral addition in the form of blast furnace slag, which exhibits long-term binding properties. The increase in the compressive strength of the concrete with the formula C_III in the period between 28 and 90 days was 16.4%.

3.3. Flexural Strength of Concrete

The influence of the type of cement on the bending strength was determined according to PN-EN 12390-5 after 28 and 90 days of maturation. The production and storage of 12 samples during maturation was performed in accordance with the requirements of EN 12390-2. The average results of the obtained tests are summarized in Table 7:
The highest flexural strength results were obtained for concrete with CEM III after both 28 and 90 days of maturation. Regardless of the type of cement, all concretes reached the minimum of 5.5 MPa required by the specifications. Concrete based on CEM III cement reached 7.0 and 7.8 MPa, respectively, after 28 and 90 days of maturation. For CEM I cement, the obtained results were lower by 2.9% and 10.3% compared to CEM III. The increase in the strength of concrete with formula C_III in the period from 28 to 90 days was 11.4%.

3.4. Determination of Concrete Tensile Splitting Strength of the Test Specimens

The determination of the impact of the type of cement on the tensile splitting strength of the test specimens was performed in accordance with PN-EN 12390-6 after 28 and 90 days of maturation. The production and storage of 12 samples during maturation was compliant with the requirements of EN 12390-2. The average results of the obtained tests are summarized in Table 8:
The highest tensile splitting strength of the test specimens was achieved for C_I concrete after both 28 and 90 days. Regardless of the type of cement, all concretes reached the minimum of 3.5 MPa required by the specifications.

3.5. Determination of Frost Resistance after 150 Cycles

Concrete frost resistance was tested in accordance with PN-B-06250:1988 using the standard method, the procedure for F150 freezing and thawing cycles. From each of the tested mixtures, 12 cubes with the side length of 100 mm were formed. The produced specimens were then immersed in water for 28 days. Six samples of each blend were then weighed and subjected to 150 freeze–thaw cycles. The remaining six samples were left immersed in water as reference samples. After 150 freeze–thaw cycles, the samples were weighed and visually inspected. The compressive strength of all samples was determined as the last step in the test procedure. According to the frost resistance criteria, PN-B-06250: 1988, the weight variation cannot exceed 5%, and the loss of compressive strength cannot exceed 20% in reference to samples made of the same mixture that have not been subjected to cyclic freezing and thawing. Moreover, the samples after testing must not show any cracks. The test results are summarized in Table 9 below:
When analyzing the obtained results of strength tests in the form of frost resistance after 150 cycles, it should be noted that the smallest decrease in compressive strength after 150 cycles of freezing and thawing, amounting to 4.1%, was obtained for concrete C3_III. The tested pavement concretes based on CEM I and CEM III met the condition required in the technical specification because the decrease in compressive strength was less than 20% and the weight loss of the samples was less than 5%.

3.6. Air Void Analysis

The characteristics of air voids in hardened concrete were determined in accordance with EN 480-11: 2008. Test specimens with dimensions of 150 × 100 × 20 mm were cut from cubes with a side length of 150 mm formed in the laboratory. The void characteristics were measured by the microscopic method using a computer system for automatic image analysis, Nikon SMZ1270 Navitar. Two samples of each tested concrete were selected for testing the properties of air voids. The image of the hardened concrete structure is shown in Figure 4.
To determine the spacing of air voids, a calculation model was adopted, which assumes the presence of air voids of a specific diameter. It is a transitional model between the real state and the Powers model. The results of the air voids distribution in the hardened concrete are presented in Table 10.
The obtained average values of the analyzed parameters, determined in accordance with the EN 480-11: 2008 [58] standard in individual tests, are presented in Table 10 Each result is the average of 4 tested samples. By analyzing the obtained results of determining the characteristics of the spacing of air voids, it can be concluded that they meet the requirements for pavement concrete used in XF conditions.
The total air content is similar to the results obtained in the concrete mix air content method, determined by the pressure method (from 5.1% to 5.8%). The total air content in the hardened concrete ranges from 4.71% to 5.77%. The highest value of the air gap coefficient (L) and the lowest micro air-void content (A300) were demonstrated by the concrete marked C_III based on the CEM III cement.

4. Discussion

When analyzing the obtained test results, it should be stated that the pavement concrete with the use of CEM III/A 42.5 HSR-NA cement meets very high requirements for a modern concrete pavement intended for heavy traffic on motorways. The aim of the research work was to check the properties of concrete for two different cements, CEM I 42.5 R-NA, commonly used and required in Poland, and CEM III/A 42.5 HSR-NA, which is a very interesting alternative, especially in terms of reducing the carbon footprint and environmental protection. The composition of CEM III cement contains over 45% of blast furnace slag which is a waste material, and thanks to this we can reduce the carbon footprint and CO2 emissions by over 30%. By analyzing the individual properties of the concrete mix, it can be stated that the C_III concrete mix has better rheological properties after both 5 and 60 min from mixing the components. Analyzing the results of strength tests, it can be concluded that the concrete with CEM III has a compressive strength higher by 9% after 90 days of maturation. The use of CEM III cement for the construction of cement concrete road pavements is a beneficial alternative for the future, as it results in the reduction in the carbon footprint and lower CO2 emissions [10], at the same time allowing for the use of waste material such as blast furnace slag without losing the properties of concrete. The durability of pavement concrete verified during F150 frost resistance tests and the analysis of the air-entrainment structure clearly indicate the possibility of using CEM III/A 42.5 HSR-NA cement for the construction of concrete pavements.

5. Conclusions

Based on the tests carried out for the C35/45 class pavement concrete tested on two different cements, CEM I 42.5 R-NA and CEM III/A 42.5 HSR-NA, the following conclusions can be drawn:
  • For both cements, the specification requirements were met, both in terms of strength tests and durability tests.
  • The use of CEM III multi-component cement in concrete allowed to achieve 71 MPa of compressive strength after 90 days of maturation, i.e., 9% more than for CEM I.
  • The use of CEM III cement improved frost resistance, as the decrease in compressive strength was 4.1%, and 10.5% for concrete with CEM I.
  • Concrete with CEM III multi-component cement achieved a better pore structure in the form of A300—3.15% and L—0.07.
  • Multi-component cement increases the filling of the cement paste structure, and thus increases the durability of cement concrete by reducing the loss of strength by up to 60%.

Author Contributions

Conceptualization, T.R.; methodology, T.R.; software, T.R.; validation, T.R.; formal analysis, T.R.; investigation, T.R.; resources, T.R.; data curation, T.R.; writing—original draft preparation, T.R.; writing—review and editing, T.R.; visualization, T.R.; supervision, T.R.; project administration, T.R.; funding acquisition, T.R. All authors have read and agreed to the published version of the manuscript.

Funding

Faculty of Civil Engineering and Geodesy, Military University of Technology, 2 Kaliskiego St., 00-908 Warsaw, Poland.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

Not applicable.

Conflicts of Interest

The authors declare no conflict of interest.

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  46. PN-EN 197-1:2012; Cement—Część 1: Skład, Wymagania i Kryteria Zgodności Dotyczące Cementów Powszechnego Użytku. Polski komitet normalizacyjny: Warszawa, Poland.
  47. PN-EN 934-1; Domieszki do Betonu, Zaprawy i Zaczynu—Część 1: Wymagania Podstawowe. Polski komitet normalizacyjny: Warszawa, Poland.
  48. PN-EN 934-2; Domieszki do Betonu, Zaprawy i Zaczynu—Część 2: Domieszki do Betonu. Definicje, Wymagania, Zgodność, Znakowanie i Etykietowanie. Polski komitet normalizacyjny: Warszawa, Poland.
  49. PN-EN 1008; Woda Zarobowa do Betonu. Polski komitet normalizacyjny: Warszawa, Poland.
  50. EN 12350-2:2019; Testing Fresh Concrete—Part 2: VeBe consistency testing. Comite Europeen de Normalisation: Brussels, Belgium, 2019.
  51. EN 12350-7:2019; Testing Fresh Concrete. Air content. Pressure Methods. Comite Europeen de Normalization: Brussels: Belgium, 2019.
  52. EN 12350-6:2019; Testing Fresh Concrete. Density. Comite Europeen de Normalisation: Brussels, Belgium, 2019.
  53. EN 12390-2:2019; Testing Hardened Concrete—Part 2: Making and Curing Specimens for Strength Tests. Comite Europeen de Normalisation: Brussels, Belgium, 2019.
  54. EN 12390-3:2019; Testing Hardened Concrete—Part 3: Compressive Strength of Test Specimens. Comite Europeen de Normalisation: Brussels, Belgium, 2019.
  55. EN 12390-6:2019; Testing Hardened Concrete—Part 6: Bending Strength of Test Specimens. Comite Europeen de Normalisation: Brussels, Belgium, 2019.
  56. EN 12390-5:2019; Testing Hardened Concrete—Part 5: Tensile Strength when Splitting Test Specimens. Comite Europeen de Normalisation: Brussels, Belgium, 2019.
  57. PN-B-06250:1988; Polish Standard Normal Concrete (in Polish). PKN: Warsaw, Poland, 1988.
  58. EN 480-11:2008; Admixtures for Concrete, Mortar and Grout-Test Methods—Part 11: Determination of Air Void Characteristics in Hardened Concrete. Comite Europeen de Normalisation: Brussels, Belgium, 2008.
Materials 15 04998 g001 550
Figure 1. Pictures of cement samples: (a) CEM I 42.5 R-NA; (b) CEM III/A 42.5 HSR-NA.
Figure 1. Pictures of cement samples: (a) CEM I 42.5 R-NA; (b) CEM III/A 42.5 HSR-NA.
Materials 15 04998 g001
Materials 15 04998 g002 550
Figure 2. Mineral mixture grading curve.
Figure 2. Mineral mixture grading curve.
Materials 15 04998 g002
Materials 15 04998 g003 550
Figure 3. Influence of the type of cement on the determination of the compressive strength of concrete.
Figure 3. Influence of the type of cement on the determination of the compressive strength of concrete.
Materials 15 04998 g003
Materials 15 04998 g004a 550Materials 15 04998 g004b 550
Figure 4. The image of the tested concrete samples after cutting: (a) and (b) C_I; (c) and (d) C_III.
Figure 4. The image of the tested concrete samples after cutting: (a) and (b) C_I; (c) and (d) C_III.
Materials 15 04998 g004aMaterials 15 04998 g004b
Table
Table 1. Properties of cements provided by the manufacturer.
Table 1. Properties of cements provided by the manufacturer.
PropertyUnitType of Cement
CEM I 42.5 R-NACEM III/A 42.5 HSR-NA
Water Lust%25.829.8
Seting time initialmin205238
Seting time finalmin274317
Consistency in volumemm0.80.8
Specific surfacecm2/g32754466
Compressive strength F2MPa26.814.2
Compressive strength F28MPa54.751.5
LOI%3.372.61
IR%0.660.82
SiO2%18.9529.18
Al2O3%4.996.17
Fe2O3%2.811.55
CaO%62.8250.54
MgO%1.374.04
SO3%3.142.48
Na2O%0.210.33
K2O%0.880.69
eqNa2O%0.590.78
Cl−%0.080.07
Table
Table 2. Requirements for the concrete pavement for traffic categories KR5—KR7.
Table 2. Requirements for the concrete pavement for traffic categories KR5—KR7.
Properties of Concrete PavementRequirementsTest Method
Density, tolerance in reference to the formula±3.0%PN-EN 12390-7
Compressive strength class for traffic category KR5—KR7, not lower than:C35/45PN-EN 12390-3
Flexural strength of concrete for traffic category KR5—KR7, not lower than:5.5 MPaPN-EN 12390-5
Tensile strength of concrete when splitting for traffic category KR5—KR7, not lower than:3.5 MPaPN-EN 12390-6
Characteristics of air pores in concrete:
PN-EN 480-11
−
the content of micropores with a diameter below 0.3 mm (A300), %
−
index of the distribution of pores in concrete, L mm
≥1.5%
≤0.200 mm
Concrete frost resistance test F150:PN-B-06250
−
weight loss of the sample, not more than, %
−
decrease in compressive strength, no more than, %
5 %
20%
Table
Table 3. Graining of materials.
Table 3. Graining of materials.
SieveScreening [%]
[mm]Granite 16/22Granite 8/16Granite 2/8Sand 0/2
22.0001.00.00.00.0
16.00095.51.70.000.0
8.0003.596.31.20.0
4.0000.02.059.700.0
2.0000.00.039.102.5
1.0000.00.00.015.9
0.5000.00.00.025.5
0.2500.00.00.0043.4
0.1250.00.00.011.9
0.0000.00.00.00.8
sum:100.0100.0100.0100.0
Table
Table 4. Composition of concrete mixtures.
Table 4. Composition of concrete mixtures.
MaterialsConcrete Mix Compositions [kg/m3]
C_IC_III
CEM I 42.5 R380-
CEM III A 42.5 HSR-NA-380
Water152152
Sand 0/2573573
Granite 2/8401401
Granite 8/16363363
Granite 16/22573573
SP PC 3.043.04
LPA0.760.76
Density2446.12446.1
Table
Table 5. Properties of the concrete mix.
Table 5. Properties of the concrete mix.
MaterialsComposition of Concrete Mixtures [kg/m3]
C_IC_III
Consistency after 5 min, s1415
Consistency after 60 min, s1014
Air content after 5 min, %5.85.6
Air content after 60 min, %5.15.4
Density, g/cm32.4402.442
Table
Table 6. Influence of the type of cement on the compressive strength after 7, 28 and 90 days of maturation.
Table 6. Influence of the type of cement on the compressive strength after 7, 28 and 90 days of maturation.
MaterialsCompressive Strength [MPa]
C_IC_III
Compressive strength after 7 days49.644.5
Compressive strength after 28 days57.460.3
Compressive strength after 90 days64.570.2
Density, g/cm32.4422.447
Table
Table 7. Influence of the cement type on flexural strength after 7, 28 and 90 days of maturation.
Table 7. Influence of the cement type on flexural strength after 7, 28 and 90 days of maturation.
MaterialsFlexural Strength [MPa]
C_IC_III
Flexural strength after 28 days6.87.0
Flexural strength after 90 days7.07.8
Table
Table 8. Influence of the type of cement on the tensile splitting strength of the test specimens after 28 and 90 days.
Table 8. Influence of the type of cement on the tensile splitting strength of the test specimens after 28 and 90 days.
MaterialsTensile Splitting Strength of the Test Specimens [MPa]
C_IC_III
Concrete tensile splitting strength of the test specimens after 28 days4.54.4
Concrete tensile splitting strength of the test specimens after 90 days5.45.2
Table
Table 9. Influence of the cement type on frost resistance after 28 days of maturation.
Table 9. Influence of the cement type on frost resistance after 28 days of maturation.
Frost Resistance Test F150Type of Mixture
C_IC_III
Mean decrease in the strength of specimens ΔR, %10.54.1
Mass change of specimens subjected to cyclical freezing and thawing ΔG, %0.030.02
Table
Table 10. The average values of the parameters characterizing air voids and their spacing.
Table 10. The average values of the parameters characterizing air voids and their spacing.
ParameterUnitC_IC_III
Total air content, A%4.715.77
Spacing factor, Lmm0.160.07
Micro air-void content, A300%2.493.15
Specific surface of the airmm−148.656.8
Total traverse lengthmm26462646
Total number of chords measured 32143214
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Rudnicki, T. The Influence of the Type of Cement on the Properties of Surface Cement Concrete. Materials 2022, 15, 4998. https://doi.org/10.3390/ma15144998

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Rudnicki T. The Influence of the Type of Cement on the Properties of Surface Cement Concrete. Materials. 2022; 15(14):4998. https://doi.org/10.3390/ma15144998

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Rudnicki, Tomasz. 2022. "The Influence of the Type of Cement on the Properties of Surface Cement Concrete" Materials 15, no. 14: 4998. https://doi.org/10.3390/ma15144998

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