Mechanical property of strain-hardening cementitious composites modified with superabsorbent polymers  

高吸水性树脂改进应变硬化水泥基复合材料的力学性能（英文）

作　　者：Deng Hanwen 

机构地区：[1]School of Transportation, Southeast University, Nanjing 210096, China

出　　处：《Journal of Southeast University(English Edition)》2017年第3期309-315,共7页东南大学学报（英文版）

基　　金：The National Natural Science Foundation of China(No.51278097);Start-up Grant provided by Nanyang Technological University(No.M4081208)

摘　　要：In order to improve the tensile property, flexuralproperty and drying shrinkage of strain-hardening cementitiouscomposites （SHCC）, mixtures quantitatively modified withsuperabsorbent polymer （SAP） were investigated. Theuniaxial tensile test, the four-point bending test, thecompressive test, the drying shrinkage test and theenvironmental scanning electron microscope （ESEM） wereemployed to investigate the tensile strain capacity, flexuraldeformation capacity, compressive strength, drying shrinkage,crack width and self-healing of SHCC. The experimentalresults show that SHCC modified with SAP particles exhibitsexcellent ductility and deformability, and the tensile strain isup to about 4.5% and the average crack width is controlledaround 40 μm. Meanwhile, the drying shrinkage of SHCCmodified with SAP particles can reduce by about 60%.Furthermore, the self-healing behavior is observed in thecracks of specimen after three cycles of high-low relativehumidity curing, and the self-healing products can completelyfill the cracks of SHCC specimens modified with SAPparticles. It is, therefore, feasible to produce SHCC materialmodified with SAP particles, while simultaneously retaininghigher material ductility.In order to improve the tensile property, flexural property and drying shrinkage of strain-hardening cementitious composites( SHCC), mixtures quantitatively modified with superabsorbent polymer( SAP) were investigated. The uniaxial tensile test, the four-point bending test, the compressive test, the drying shrinkage test and the environmental scanning electron microscope( ESEM) were employed to investigate the tensile strain capacity, flexural deformation capacity, compressive strength, drying shrinkage,crack width and self-healing of SHCC. The experimental results showthat SHCC modified with SAP particles exhibits excellent ductility and deformability, and the tensile strain is up to about 4. 5% and the average crack width is controlled around 40 μm. Meanwhile, the drying shrinkage of SHCC modified with SAP particles can reduce by about 60%.Furthermore, the self-healing behavior is observed in the cracks of specimen after three cycles of high-lowrelative humidity curing, and the self-healing products can completely fill the cracks of SHCC specimens modified with SAP particles. It is, therefore, feasible to produce SHCC material modified with SAP particles, while simultaneously retaining higher material ductility.

关 键 词：STRAIN-HARDENING cementitious composites (SHCC) SUPERABSORBENT polymer (SAP) mechanical property SELF-HEALING 

分 类 号：N0[自然科学总论—科学技术哲学]