含SAP水泥基材料动态力学性能演变规律研究

摘要/Abstract

摘要： 关于高应变速率下含高吸水树脂(SAP)水泥基材料力学行为的研究较少,本文通过压汞法和图像法研究了含SAP水泥基材料的总孔隙率和宏观孔(>100 μm)孔隙率;分析了SAP粒径和补偿水对改性材料准静态(10^-5 s^-1)和动态(60~110 s^-1)力学性能的影响;基于裂缝扩展行为的研究,解析了高应变速率下水泥基材料的破坏行为。结果表明:添加补偿水和增大SAP粒径均会提升材料的宏观孔孔隙率和总孔隙率,从而降低准静态和动态压缩作用下试样的抗压强度和弹性模量;添加补偿水和增大SAP粒径还会提高水泥基材料的抗压强度动态增加因子和弹性模量动态增加因子,这是由于总孔隙率和宏观孔孔隙率的增加会引起裂缝扩展路径的改变、破碎程度的增加以及应变响应的延迟。

关键词: 水泥基材料, 高吸水树脂(SAP), 孔结构, 动态力学试验, 断裂行为, 动态增加因子(DIF)

Abstract: There is less research on the mechanical behavior ofcement-based materials containing superabsorbent polymers (SAP) under high strain rate. In this paper, the total porosity and macroscopic pore (>100 μm) porosity of cement-based materials containing SAP were investigated by the use of mercury intrusion and graphical techniques. The effects of SAP particle size and extra water on the quasi-static (10^-5 s^-1) and dynamic (60~110 s^-1) mechanical properties of the modified materials were analysed. Based on the study of the crack propagation behavior, the damage behavior of the cement-based materials was analyzed under high strain rates. The results show that the addition of extra water and the increase of SAP particle size improve the total porosity and macroscopic pore porosity of the materials, which reduce the compressive strength and elastic modulus of the specimens under quasi-static and dynamic compression. The addition of extra water and the increase of SAP particle size also enlarge the compressive strength dynamic increase factor and elastic modulus dynamic increase factor of the cement-based materials, which is due to the fact that an increase in total porosity and macroscopic pore porosity induces a change in the crack extension path, an increase in fragmentation, and a delay in the strain response.

Key words: cement-based material, superabsorbent polymers (SAP), pore structure, dynamic mechanical experiment, fracture behavior, dynamic increase factor (DIF)

中图分类号:

TQ172

李剑峰. 含SAP水泥基材料动态力学性能演变规律研究[J]. 硅酸盐通报, 2024, 43(6): 2022-2030.

LI Jianfeng. Evolution Rule of Dynamic Mechanical Properties of Cement-Based Materials Containing SAP[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(6): 2022-2030.

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