碱液处理SAP在大掺量粉煤灰体系中的性能研究  

Study on the performance of SAP prepared by alkaline solution in high volume fly ash system

作　　者：钱雄 刘云鹏[1] 张文芹[1] 杨进 QIAN Xiong;LIU Yunpeng;ZHANG Wenqin;YANG Jin(State Key Laboratory of Silicate Materials for Architecture,Wuhan University of Technology,Wuhan 430070,China;College of Civil and Environmental Engineering,Hubei University of Technology,Wuhan 430068,China)

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,湖北武汉430070 [2]湖北工业大学土木建筑与环境学院,湖北武汉430068

出　　处：《混凝土》2018年第9期85-88,92,共5页Concrete

基　　金："十二五"国家科技支撑计划(2014BAB15B01);国家自然科学基金(51502223);湖北省科研条件与资源研究开发项目(2015BCE078)

摘　　要：将高吸水性树脂(SAP)内养护与碱激发技术结合应用于大掺量粉煤灰(HVFA)体系中。研究了SAP在不同碱激发剂溶液中的吸水倍率,在相同SAP掺量下,保证引入水量相同,研究了不同激发剂、不同掺入方式对HVFA体系的力学性能、水化程度、显微硬度的影响规律。结果表明:碱激发剂效果Na_2SO_4>NaOH>Na_2CO_3,SAP预吸激发剂可促进水泥及粉煤灰早期水化,提高早期抗压强度20%以上,水化程度提升1.5%～5.0%。微观性能的研究表明,粒径4～5 mm的球形SAP的释水行为促进了浆体周围的水化程度,提升结构密实性及微观力学性能,并在其周围形成1 000～1 500μm的养护区域。Combining the superabsorbent polymer(SAP)internal curing with alkali-activation technics in high volume fly ash(HVFA)system.The water absorption rate of SAP in different base activator solutions was studied,the effects of different activators and different incorporation modes on the mechanical properties,hydration degree and microhardness of HVFA system were studied under the same SAP dosage.The results indicated that the effectiveness of activators are Na2SO4>NaOH>Na2CO3.Pre-stimulated by SAP can promote the early hydration of cement and fly ash,improve the early compressive strength of more than 20%,the degree of hydration increased by 1.5%~5.0%.Microscopic study revealed that the water release behavior of spherical SAP with particle size of 4~5 mm promotes the degree of hydration around the paste,improves the structural compactness and micro-mechanical properties,and forms a curing area of 1 000~1 500μm around it.

关 键 词：大掺量粉煤灰 碱激发 高吸水性树脂 水化程度 

分 类 号：TU528.041[建筑科学—建筑技术科学]