*Proceeding Paper* **Sulfate Resistance in Carbonated Low-Calcium Silicate Cement Pastes †**

**Raikhan Tokpatayeva 1,\* , Jan Olek <sup>1</sup> and Sadananda Sahu <sup>2</sup>**


**Abstract:** This paper focuses on the evaluation of sulfate resistance in carbonated pastes prepared from low-lime calcium silicates (CCS). The chemical interaction between the sulfate solution and paste powders was assessed by monitoring the leaching of the Ca and Si species, reduction in the content of carbonates and formation of gypsum. The analytical techniques used in the study included TGA, ICP-OES and IC. The results of the study revealed that the level of the resistance to the chemical effect of the sulfates depends on the type of the calcium silicate, degree of crystallinity of calcium carbonate, and the type of cation present in the sulfate solution.

**Keywords:** carbonation; calcium silicates; sulfate resistance
