SAP内养护剂改善膨胀混凝土性能及其机理研究  

Research on Performance Improvement of Expansive Concrete with Internal Curing Agent SAP and Its Action Mechanism

作　　者：秦鸿根[1,2] 高美蓉[1,2] 庞超明[1,2] 孙伟[1,2] 

机构地区：[1]东南大学材料科学与工程学院,江苏南京211189 [2]东南大学江苏省土木工程材料重点实验室,江苏南京211189

出　　处：《建筑材料学报》2011年第3期394-399,共6页Journal of Building Materials

基　　金：国家重点基础研究发展计划(973计划)项目(2009CB623200)

摘　　要：研究了SAP(超强吸水树脂)内养护剂对膨胀混凝土力学性能、变形开裂性能和耐久性能的影响,然后通过MIP,SEM,XRD等手段对其养护机理进行了微观分析.结果表明:掺加SAP可显著提高膨胀混凝土的早期膨胀值和限制膨胀率,降低膨胀与收缩变形的差值,且对强度、渗透性无不利影响.由于SAP具有吸水-释水功能,因此掺加SAP将有利于钙矾石的生成和水泥水化程度的提高,并能有效改善膨胀混凝土的孔结构分布.The effect of SAP（super absorbent polymer） on macro-properties of expansive concrete including mechanical properties,deformation properties,shrinkage cracking resistance and durability was investigated. MIP,SEM and XRD tests were conducted in order to study curing mechanism of SAP.The results show that SAP can significantly improve the early expansion,restrict expansion and reduce autogenous shrinkage,and it also has no adverse effect on the strength and permeability,it can be concluded that SAP can accelerate ettringite formation,improve the cement hydration and change the pore structure of concrete due to water absorption and release of SAP.

关 键 词：膨胀混凝土 内养护剂 超强吸水树脂 变形性能 微观分析 

分 类 号：TU528.55[建筑科学—建筑技术科学]