水泥-膨胀剂-粉煤灰复合胶凝材料膨胀与强度发展的协调性研究  

Coordination between expansion and strength development of cement-expansive agent-fly ash ternary cementitious materials

作　　者：王栋民[1] 张守祺[1] 王振华[1] 欧阳世翕[2] 

机构地区：[1]中国矿业大学(北京)混凝土与环境材料研究所,北京100083 [2]中国建筑材料科学研究总院,北京100024

出　　处：《混凝土》2010年第1期1-3,6,共4页Concrete

基　　金：清华大学水沙科学与水利水电工程国家重点实验室开放研究基金项目"高性能大坝膨胀混凝土组成;结构与性能研究"(sklhse-2008-D-04)

摘　　要：研究了水泥-膨胀剂二元复合胶凝材料和水泥-膨胀剂-粉煤灰三元复合胶凝材料，这两种胶凝材料可以用于制备具有良好体积稳定性的高性能膨胀混凝土。研究表明：存在一个最优辅助胶凝材料掺量组合，在此条件下胶凝材料具有良好的膨胀与强度的协调性，在水泥-膨胀剂体系中，膨胀剂掺量范围在6％-12％，其中掺6％～8％适用于配制补偿收缩混凝土，掺8％-12％适用于填充性混凝土。在水泥-膨胀剂-低钙粉煤灰体系中，CSA合理掺量范围为8％～12％；在水泥-膨胀剂-高钙粉煤灰体系中，合理掺量范围是6％-8％。粉煤灰的掺入可以削减由于膨胀剂过量而导致过高的限制膨胀率，从而避免由此造成的膨胀破坏现象，低钙粉煤灰的作用优于高钙粉煤灰。The expansion and strength of both C-CSA binary eementitious material and C-CSA-FA temary cementitious material,which were applied in HPEC with better volume stability investigated.It is indicated that there is an ideal composition by which cementitious materials will have excellent coordination between expansive and strength,In the C-CSA system, the CSA dosage range in 6%-12%.6%-8% CSA dosage is suited to shrinkage compensation concrete while 8%M2% CSA dosage is suited to filler concrete.In the C-CSA-Iow calcium fly ash system ,the CSA better dosage range in 8%M2% while 6%-8% in the C-CSA-high calcium fly ash system.The excess expansion ratio under restraint led by the ex- ceed expansion agent can be cut by FA and the expansive wreck caused by high expansion ratio can also be reduced.For which,the role of low calcium fly ash is better than high calcium fly ash.

关 键 词：胶凝材料 膨胀剂 低钙粉煤灰 高钙粉煤灰 高性能膨胀混凝土 

分 类 号：TU528.01[建筑科学—建筑技术科学]