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高吸水性树脂多孔混凝土静态力学特性与损伤本构模型
作者：张金1，肖定军1，2，林谋金1，2，邓小康1，蒲传金1，2，金翰呈3
（1.西南科技大学 环境与资源学院，四川 绵阳 621010；
2.西南科技大学 工程材料与结构冲击振动四川省重点实验室，四川 绵阳 621010；
3.绵阳市海川爆破工程有限公司，四川 绵阳 621010）
摘要：利用大小可控的球形高吸水性树脂（SAP）与水泥基制成SAP多孔混凝土，对其进行一维应变加载，探究了孔隙率为38%、48%、53%的SAP多孔混凝土静态力学性能及耗能特性。结果表明：SAP多孔混凝土应力-应变曲线具有多孔材料典型的三阶段特征；且孔隙率、平台应力、压实应变对材料能量吸收有显著影响；在密度为997~1321 kg/m3内，SAP多孔混凝土的吸能能力会随孔隙率减小而增加。根据实验结果结合损伤因子和Weibull分布理论，建立了基于SAP多孔混凝土密度的损伤本构模型，得到预测不同密度的SAP多孔混凝土损伤演化行为的本构模型，且模型预测结果与试验结果吻合较好。
关键词：多孔混凝土；高吸水性树脂；能量吸收；本构模型；收缩开裂
中图分类号：TU528.2 文献标识码：A 文章编号：1001-702X（2023）04-0050-06
Static properties and damage constitutive model of SAP porous concrete
ZHANG Jin1，XIAO Dingjun1，2，LIN Moujin1，2，DENG Xiaokang1，PU Chuanjin1，2，JIN Hancheng3
（1.College of Environment and Resources，Southwest University of Science and Technology，Mianyang 621010，China；2.Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province，Southwesst University of Science and Technology，Mianyang 621010，China；3.Mianyang Haichuan Blasting Engineering Co. Ltd.，Mianyang 621010，China）
Abstract：SAP porous concrete was made by using controllable spherical Super Absorbent Polymers（SAP） and cement-based materials，and subjected to one-dimensional strain loading. The static mechanical properties and energy consumption characteristics of SAP porous concrete with porosity of 38%，48%，and 53% were investigated. The results indicate that the stress-strain curve of SAP porous concrete exhibits typical three-stage characteristics of porous materials; And porosity，platform stress，and compaction strain have a significant impact on material energy absorption. Within the density range of 997~1321 kg/m3，the energy absorption capacity of SAP porous concrete will increase with a decrease in porosity. Based on the experimental results，combined with damage factors and Weibull fraction theory，a damage constitutive model based on SAP porous concrete density was established to predict the damage evolution behavior of SAP porous concrete at different densities. The predicted results of the model were in good agreement with the experimental results.
Key words：porous concrete，SAP，energy absorption，constitutive model，contraction and fatigue