聚羧酸减水剂在劣质砂石混凝土中的失效分析.pdfVIP

学兔兔 2012年第 6期(总第 272期 ) 混 凝 土 原材料及辅助物料 Number 6 in 2012(Toml No．272) Concrete MATERIAL AND ADMINICLE doi：10．39698．issn．1002-3550．2012．06．027 聚羧酸减水剂在劣质砂石混凝土中的失效分析 吴 昊，王子明 (北京工业大学 材料科学与工程学院，北京 100124) 摘 要：劣质砂石料中的泥土成分对聚羧酸减水剂具有强烈的抑制效应。试验中发现几个不同地区的砂石料都在不同程度上对聚羧酸 减水剂产生影响，表现为坍落度损失快，工作性能变差。经过XRD测试发现，砂石中泥成分主要为SiO2、长石类，云母类以及黏土类矿物 等。通过对PCE一1的TOC测试得知，长石，高岭石和绢云母等对聚羧酸减水剂均具有很强的吸附作用。在胶砂流动度试验中，外掺泥土的 拌合物的5、30、60min的扩展度值均小于blank样，长石和绢云母具有较强的吸附作用，蒙脱石的吸附能力最强。 关键词：泥土；聚羧酸系减水剂；吸附量 中图分类号：TU528．042 文献标志码：A 文章编号： 1002—3550(2012)06—0086—03 Analysis of polycarboxylate superplasticizer failure in concrete with poor-quality sand WUHao，WANGZi-ming (College ofMatefials Science and Engineering，Beijing University ofTechnology，Beijing 100124，China) Abstract： Mud in the poovquality sand has intense restrained effect to polycarboxylate superplasticizer． It’S has been found that several sand from different regions has effect to polycarboxylate superplasticizer in var~ng degree through experiment，which performance is quick loss of slump，workability worsen．Through XRD it Can be seen that the main compositions of the mud in sand are SiO2，feldspar，mica and clay．etc． Feldspar，kaolinite and sericite have intense adsorption effect to polycarboxylate superplasticizer through the TOC test with PCE一1 we known．In test offluidityofcementmortar，the all results ofmortarwithmud at 5min，3Ominand 60min arcmorethan blank sample，feldsparand sericite have intense adsorption to polycarboxylate superplasticizer，turface has the greatest adsorpti