*2.1. Experimental Program*

The experimental program was designed to produce SCC with a high replacement level of OPC content by incorporating accurate amounts of several combinations of FA with MS and GGBS with MS. Table 5 shows the mixture proportions used in this experimental work. Seven SCC mixtures were prepared with a constant water-to-binder ratio (w/b) of 0.33. Different characteristics of SCC were investigated according to the ASTM [59] and European guidelines [60].


**Table 5.** SCC mixture proportions.

#### *2.2. Testing Procedures*

Fresh properties of SCC were determined by using the slump-flow test to determine the concrete flowability [59,61] (Figure 1) and V-funnel [62], L-box [63], and J-ring [64] tests, as shown in Figures 2–4, respectively. SCC viscosity was assessed by measuring the flow rate using the V-funnel test. The L-box test was used to measure the passing ability of SCC [2], and the flow spread with passing ability was measured by using the J-ring test. The durability of SCC was measured by applying different tests that have been used regularly for standard concrete [20–22]. Water absorption (Figure 5) was determined according to BS 1881: 122 [65]. Water permeability (Figure 6) was determined according to BS EN 12390 [66]. The rapid chloride penetration test (RCPT) (Figure 7) was conducted for all concrete mixtures to measure the electrical conductance and ability to resist chloride ion penetration. The RCP test was conducted according to ASTM C 1202 [67]. Figure 8 shows sample preparation.

**Figure 1.** Slump-flow test.

**Figure 2.** V-funnel test.

**Figure 3.** L-box test.

**Figure 4.** J-ring flow test.

**Figure 5.** Water absorption test device.

**Figure 6.** Water permeability test device.

**Figure 7.** RCPT device.

**Figure 8.** Sample preparation.
