橡胶集料对水泥基复合材料性能的影响

doi:10.16552/j.cnki.issn1001-1625.2025.0741

摘要/Abstract

摘要： 本研究采用普通和改性的橡胶集料制备不同掺量与粒径的普通/改性橡胶集料水泥砂浆(CRM/MRM),探究橡胶对砂浆流动度、流变性及力学性能的影响。结果表明:在流动性方面,CRM流动度较低,仅有90~95 mm,而MRM流动度达220~225 mm,且均一性良好;在流变性方面,CRM表现为胀塑性流体(剪切稠化),MRM呈假塑性流体(剪切稀化),且两者触变性和流变性均随橡胶掺量增加而增大;在力学性能方面,橡胶的掺入显著降低了砂浆抗压与抗折强度,且抗折强度的降幅小于抗压强度的降幅。改性橡胶体系28 d抗压与抗折强度较未改性体系分别提升70.5%和32.6%;大粒径橡胶更有利于维持抗折强度。微观分析表明:改性处理使橡胶-水泥界面过渡区厚度从160 μm降低至80 μm,消除了界面空穴,形成梯度硬度结构,促使材料破坏模式由脆性向延性转变。

关键词: 水泥砂浆, 橡胶集料, 改性, 流动度, 流变性, 力学性能, 微观机理

Abstract: In this study, common and modified rubber aggregates were used to prepare common/modified rubber aggregate cement mortar (CRM/MRM) with different content and particle sizes, and the effects of rubber on the fluidity, rheology and mechanical properties of mortar were investigated. The results show that: in terms of fluidity, CRM has a low fluidity of only 90~95 mm, while MRM has a fluidity of 220~225 mm and good uniformity. In terms of rheology, CRM is characterized by dilatant fluid (shear thickening) and MRM is pseudoplastic fluid (shear thinning). And the thixotropy and rheology of both increase with the increase of rubber content. In terms of mechanical properties, the incorporation of rubber significantly reduced the compressive and flexural strength of mortar, and the decrease of flexural strength is less than that of compressive strength. The 28 d compressive and flexural strength of the modified rubber system increases by 70.5 % and 32.6 %, respectively, compared with the unmodified system. Large particle size rubber is more conducive to maintaining flexural strength. Microscopic analysis shows that the modification treatment reduces the thickness of the rubber-cement interface transition zone from 160 μm to 80 μm, eliminates the interface holes and forms a gradient hardness structure, which promotes the transformation of the material failure mode from brittleness to ductility.

Key words: cement mortar, rubber aggregate, modification, fluidity, rheology, mechanical property, micro mechanism

中图分类号:

TU528

曹宝栋, 康佳佳, 翟胜田. 橡胶集料对水泥基复合材料性能的影响[J]. 硅酸盐通报, 2025, 44(11): 4176-4187.

CAO Baodong, KANG Jiajia, ZHAI Shengtian. Effect of Rubber Aggregate on Properties of Cement-Based Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(11): 4176-4187.

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