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Effect of Activated Water Treatment Sludge on Carbonation of Mortar

机译：活性水处理污泥对砂浆碳化的影响

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Activated water treatment sludge (AWTS) is a newly developed environmentally friendly blending material that contains 12CaO•7Al_2O_3 and C_2S as cementitious minerals. In order to evaluation service performance of AWTS blended cement, carbonation characteristic and microstructure of mortar incorporating 20 wt. % AWTS was studied in present paper. Increasing with carbonated time prolonging under standard test condition, carbonation performance of mortar specimens achieved quality index of class T-IV of Chinese construction code JGJ/T 193-2009. Compressive strength of carbonated mortar had a little rise compared to controlled mortar cured at standard condition for 28 days. Portlandite reacts with carbon dioxide to form calcite and, calcite reacts with aluminate minerals to form monocarboaluminate. This was confirmed by SEM observation. AWTS has no disadvantageous effect on carbonation of Portland cement. More aluminate in the blended cement resulted in monocarboaluminate type AFm formation. ATWS can be employed as blending material for modern cement industry.
机译：活性水处理污泥（AWTS）是一种新开发的环保掺合材料，其中包含12CaO•7Al_2O_3和C_2S作为胶结矿物。为了评估AWTS掺和水泥的使用性能，掺入20 wt。本文研究了％AWTS。在标准试验条件下，随着碳化时间的延长，砂浆试样的碳化性能达到了中国建筑规范JGJ / T 193-2009的T-IV级质量指标。与标准条件下固化28天的受控砂浆相比，碳酸砂浆的抗压强度略有提高。硅酸盐与二氧化碳反应形成方解石，方解石与铝酸盐矿物反应形成单碳铝酸盐。 SEM观察证实了这一点。 AWTS对波特兰水泥的碳化没有不利影响。混合水泥中更多的铝酸盐导致形成单碳铝酸盐类型的AFm。 ATWS可用作现代水泥工业的混合材料。

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