萘系减水剂与缓凝剂复合效应研究

利用五种缓凝剂（包括三聚磷酸钠、酒石酸钾钠、葡萄糖、柠檬酸钠、葡萄糖酸钠等）与萘系高效减水剂进行复配,结合流动度、胶砂强度、缓凝作用等指标评判各复合外加剂的性能。研究结果表明：掺入萘系高强减水剂与缓凝剂复配溶液,水泥净浆的初凝时间和终凝时间均不同程度延长;糖类缓凝剂的保坍性能较好,当复合高效减水剂中缓凝成分控制在0.05%,水泥浆体流动度经时损失率较小;随着酒石酸钾钠和柠檬酸钠掺量增加,胶砂抗压强度呈上升趋势。

Study on Composition Effects of Naphthalene Plasticizer and Retarders

Based on composite testing of naphthalene superplasticizer and different retarders,which included sodium tripolyphosphate,sodium potassium tartrate tetrahydrate,dextrose,sodium citrate,sodium gluconate etc.),the influence of these multicomponent admixtures on flowability of cement paste、retarding action and development of strength ofcement mortar were analyzed.It was found that with these multicomponent admixtures added,initial and final setting time of cement paste were extended to varying degrees.The multicomponent admixtures mixed with saccharides showed high flowability retentivity.With 0.05% content of retarders,cement mortar showed lower the flowability loss rate.With the content of sodium potassium tartrate tetrahydrate and sodium citrate increased,the compressive strength of cement mortar went up.