高吸水性树脂对高延性水泥基材料性能的影响  

Effect of Superabsorbent Polymer on Properties of Engineered Cementitious Composites

作　　者：刘家宝 水中和[1] 亓习博 李世祥 肖勋光 LIU Jiabao;SHUI Zhonghe;QI Xibo;LI Shixiang;XIAO Xunguang(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;Wuhan University of Technology Advanced Engineering Technology Research Institute of Zhongshan City,Zhongshan 528437,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,武汉430070 [2]中山市武汉理工大学先进工程技术研究院,中山528437

出　　处：《硅酸盐通报》2023年第12期4224-4232,共9页Bulletin of the Chinese Ceramic Society

基　　金：2022年广东省中山市科技创新领军人才资助(LJ2021002);2019年度中山市第三批科技发展专项资金(高端科研机构创新转向)(2019AG030)。

摘　　要：分别采用干拌与预吸水拌合两种方式将高吸水性树脂(SAP)加入高延性水泥基材料(ECC)浆体,分析不同掺量及拌合方式下SAP对ECC的极限拉伸应变、抗拉强度、约束收缩和韧性等性能的影响。结果表明:以干拌方式加入SAP可以显著提升ECC浆体的塑性黏度,降低浆体流动性,以预吸水拌合方式加入SAP会降低ECC浆体的塑性黏度,增加浆体流动性,更易于成型;以干拌方式加入SAP的ECC试件初裂强度和抗拉强度更高,韧性更优异,以预吸水拌合方式加入SAP的ECC试件极限拉伸应变更高,对约束收缩性能的改善效果更好;加入SAP可以明显提高ECC试件的拉伸应变能力和韧性,所有掺入SAP的ECC试件均具有良好的延性,极限拉伸应变均在3%以上,加入SAP的ECC试件极限拉伸应变相比对照组提高了62.0%~99.0%。Superabsorbent polymer(SAP)was added into engineered cementitious composites(ECC)slurry through two methods of non-soaked mixing and pre-soaked mixing,and the effects of SAP on the ultimate tensile strain,tensile strength,restrained shrinkage and toughness of ECC under different dosages and mixing methods were analyzed.The results show that non-soaked mixing significantly enhances the plastic viscosity and reduces the flowability of ECC slurry upon SAP addition.Conversely,the pre-soaked mixing method decreases plastic viscosity and improves flowability,facilitating the molding process of ECC slurry.The addition of SAP to ECC through the non-soaked mixing method exhibits higher initial cracking strength and tensile strength,along with better toughness.The addition of SAP to ECC through the pre-soaked mixing method results in increased ultimate tensile strain in ECC and a more effective improvement in the performance of shrinkage restraint.SAP significantly enhances the tensile strain capacity and toughness of ECC specimens.All ECC specimens with SAP exhibit favorable ductility,with ultimate tensile strain exceeding 3%.Compared to the control group,the ultimate tensile strain of ECC with SAP has increased by 62.0%to 99.0%.

关 键 词：高延性水泥基材料 高吸水性树脂 拌合方式 极限拉伸应变 弯曲挠度 约束收缩 塑性黏度 

分 类 号：TU525.9[建筑科学—建筑技术科学]