摘要
本文将搅拌站废浆固液分离,研究了滤液和滤渣不同掺量下对水泥净浆3d和28d龄期抗压强度的影响,并对比了不同龄期浆体孔溶液的pH值,同时采用XRD和TG分析了其水化产物的变化。结果表明:滤液和滤渣都可以提高早期强度,但不利于抗压强度的继续增长;3d龄期时试件孔溶液pH值基本上随滤液替代量增大而增大,但随滤渣掺量增加呈现减小趋势。XRD图谱表明随滤液替代自来水量的增加,C2S衍射峰强度有所减弱,说明滤液替代量增大加快了水化速率。热重分析结果显示滤液促进水泥水化并增快了C-S-H凝胶、钙矾石的形成,而滤渣主要是活性SiO2,消耗Ca(OH)2,反应生成C-S-H凝胶。
The infl uence of waste water and waste residue that were separated from the slurry of concrete mixing plant on concrete strength was investigated. Furthermore, the paste hole solution pH values at diff erent ages were systematically compared.XRD and TG were also used to analyze the hydration products. The results showed that the 3-day compressive strength of the material is generally increased after adding waste water and waste residue, but the long-age hydration of Portland cement has been suppressed. Pore solution pH value presents a decreasing trend with increasing dosage of waste residue. Instead, the use of waste water increases pore solution pH value. XRD analysis showed that C2S crystal diffraction peak is weakened with increasing dosage of waste water. The formation of C-S-H gel and ettringite is increasing with waste water at the same age, indicating that waste water is conducive to promoting the hydration of cement, while C-S-H gel forms in the pozzolanic reaction of waste residue.
作者
胡立志
代飞
李伟青
戴银刚
Hu Lizhi;Dai Fei;Li Weiqing;Dai Yinguang(Wuhan University of Technology, Wuhan , Hubei , China;China Construction Commercial Concrete Co., Ltd., Wuhan , Hubei , China)
出处
《矿产综合利用》
CAS
北大核心
2019年第5期102-106,共5页
Multipurpose Utilization of Mineral Resources
关键词
滤液
滤渣
抗压强度
孔溶液pH值
水化产物
Waste water
Waste residue
Compressive strength
Pore solution pH value
Hydration products
作者简介
胡立志(1973-),男,硕士研究生,主要从事生态建筑材料研发与应用研究。
