OPERATIONAL PROPERTIES OF ORGANIC COMPOSITIONS (LIGNIN SULFONATE) IN PORTLAND CEMENT - A COMP......

The purpose of this research is to look at the manufacturing process of gypsum-free Portland cements, which are made from normal white cement clinker with a low proportion of Fe2O3 content. Gypsum-free Portland cement is a binding agent based on Portland cement clinker in which the regulating effect of gypsum is replaced by a composition of sodium lignin sulfonate and alkali metals such as carbonates. The notable quality of GF cement-based binders is the ability to generate well-workable mixes at very low water-to-cement ratios. Gypsum-free cement has a fast setting time and a high initial strength. The lowest water-to-cement ratios are found in a sample containing 1.2 wt.% sodium lignosulfonate acid and 1 wt.% sodium carbonate. The addition of 1% sodium carbonate to gypsum-free Portland cement can improve its plasticity. Furthermore, 1% sodium carbonate has been shown to shorten the initial setting time of gypsum-free Portland cement (for instance, the initial time will decrease to 70 minutes). More sodium carbonate (up to 3 percent) reduces the qualities of initial setting time and final setting time, which reach 15 and 20 minutes, respectively. The X-ray diffraction pattern for hydrated pastes of gypsum-free cement and standard white cement clinker demonstrates that amorphous Ca(OH)2 has been reduced.

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