Effects of sugar in calcium carbonate (CaCO3) sludge on properties of concrete

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Orawan Jantasuto
Narongchai Wiwattanachang


The sugar refining process typically produces waste, including calcium carbonate (CaCO3 ) sludge and wastewater. In this research, Portland cement in concrete work was replaced by CaCO3 sludge in three different levels:  17 , 50 and 83 %, respectively. The experiments were conducted by determining concrete slump, concrete setting time and compressive strength of concrete using original CaCO3  sludge (CO) with 2,000 ppm sugar and CaCO3  sludge (CW) with no sugar.

The experimental results indicated that original CaCO3  sludge (CO) could slow down the setting time of concrete and this could be solved by the replacement by CaCO3  sludge (CW). The CaC   sludge was able to extend setting time as well as reduce workability of concrete. For this reason, the water cement ratio (w/c) at equal slump was higher than usual, resulting in lower compressive strength. However, CaCO3   sludge has its benefits in terms of lower concrete cost, reducing CaCO3 sludge which was hard to be eliminated and reducing cost of additional retardant to slow down concrete setting time working under hot conditions.

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