再生砖混骨料混凝土基本力学性能与本构模型
Basic mechanical properties and constitutive model of recycled brick-concrete aggregate
朱超 1赵文韬 2余伟航 2刘超3
作者信息
- 1. 西安建筑科技大学 土木工程学院,西安 710055;西安建筑科技大学 结构工程与抗震教育部重点实验室,西安 710055
- 2. 西安建筑科技大学 理学院,西安 710055;西安建筑科技大学 结构工程与抗震教育部重点实验室,西安 710055
- 3. 西安建筑科技大学 土木工程学院,西安 710055;西安建筑科技大学 理学院,西安 710055;西安建筑科技大学 结构工程与抗震教育部重点实验室,西安 710055
- 折叠
摘要
再生混凝土骨料中往往会混有再生砖骨料难以分离,将再生砖与再生混凝土骨料混合利用更加符合实际情况.本文以不同水胶比(0.3和 0.4)、不同再生骨料取代率(体积法取代 0%、50%、100%)为控制参数,研究了 8组不同配合比的再生砖混骨料混凝土的抗压、劈裂抗拉、抗折和棱柱体抗压强度及单轴受压应力-应变关系.结果表明:与天然骨料混凝土相比,不同配合比再生混凝土力学性能有不同程度的下降,其中随着再生砖骨料含量的增加,其力学性能下降较显著,砖骨料替代率达到 100%时抗压强度下降高达 29.9%,但是仍能保证一定的力学性能储备.文中探究了水胶比与再生砖骨料掺量对混凝土力学性能的影响机制,并以试验数据为基础,建立了再生砖混骨料混凝土单轴受压本构模型和再生砖混骨料混凝土力学性能换算公式,研究结果可对此类再生混凝土结构的分析与设计提供参考.
Abstract
Recycled concrete aggregate is often mixed with recycled brick aggregate,which is difficult to separate.The mixed use of recycled brick and recycled concrete aggregate is more in line with the actual situation.Different water-binder ratios(0.3 and 0.4)and different recycled aggregate replacement rates(0%,50%,100%replaced by volume method)were used as control parameters to study the compressive strength,splitting tensile strength,flexural strength,prism compressive strength and uniaxial compressive stress-strain relationship of eight groups of recycled brick-concrete aggregate concrete with different mix ratios.The results show that compared with natural aggregate concrete,the mechanical properties of recycled concrete with different mix ratios decrease to varying degrees.With the increase of recycled brick aggregate content,the mechanical properties decrease significantly.When the replacement rate of brick aggregate reaches 100%,the compressive strength decreases by up to 29.9%,but it can still ensure a certain mechanical property reserve.In this paper,the influence mechanism of water-binder ratio and recycled brick aggregate content on the mechanical properties of concrete is explored.Based on the experimental data,the uniaxial compression constitutive model of recycled brick concrete and the conversion formula of mechanical properties of recycled brick concrete are established.The research results can provide reference for the analysis and design of such recycled concrete structures.
关键词
再生混凝土/再生砖骨料/力学性能/单轴受压/本构模型Key words
recycled concrete/recycled brick aggregate/mechanical properties/uniaxial compression/con-stitutive model引用本文复制引用
基金项目
国家自然科学基金(52178251)
陕西省杰出青年科学基金项目(2020JC-46)
中国博士后科学基金(2022MD713789)
陕西省自然科学基础研究计划(2022JQ-343)
出版年
2024
NETL
NSTL
万方数据