Effect of waste concrete with different strength on mechanical properties of recycled fine aggregate mortar  

不同强度废混凝土对再生细骨料砂浆力学性能的影响（英文）

作　　者：Ding Xiaomeng Chen Zhongfan Liu Qiong Chen Yang 丁小蒙;陈忠范;刘琼;陈阳(东南大学混凝土及预应力混凝土结构教育部重点实验室,南京210096;同济大学土木工程学院,上海200092)

机构地区：[1]Key Laboratory of Concrete and Pre-Stressed Concrete Structures of the Ministry of Education,Southeast University,Nanjing 210096,China [2]College of Civil Engineering,Tongji University,Shanghai 200092,China

出　　处：《Journal of Southeast University(English Edition)》2019年第3期374-380,共7页东南大学学报（英文版）

基　　金：The National Key Research and Development Programm of China(No.2018YFD1100402-05);the National Natural Science Foundation of China(No.6505000184)

摘　　要：The influence of source concrete (SC) with different compression strengths on the workability and mechanical properties of recycled mortar made with river sand substituted by 100% fine recycled concrete aggregates (FRCA) is experimentally investigated. The basic physical performance test shows that with the increase in SC strength, FRCA exhibit lower water absorption and crushing index, meanwhile keeping higher densities. Mechanical property tests, including compressive strength, flexural strength and uniaxial compressive stress-strain tests, show that compressive strength,flexural strength and elasticity modulus of recycled sand mortars increase roughly with the increase in SC strength. The proposed mixture design method demonstrates that all of the components can be kept as the same as those in natural mortar mixture design and FRCA must be pre-wetted before making mortar mixture. Meanwhile, the reuse of higher strength SC can ensure that recycled mortar mixtures are able to achieve similar mechanical performance when compared to natural mortar designs.试验研究了不同抗压强度的原废弃混凝土(SC)对以废弃混凝土制备的再生细骨料(FRCA)100%替代河砂而配置的再生砂浆工作性和力学性能的影响.基本物理性能试验表明,随着SC强度的增加,FRCA的吸水率和破碎指数降低,同时有较高的密度.力学性能试验包括抗压强度、抗弯强度、单轴抗压应力-应变试验,结果表明再生砂浆的抗压强度、抗折强度和弹性模量随着SC强度的增加而提升.所提出的配合比设计方法表明,再生砂浆配合比成分可与普通砂浆配合比设计相同,再生细骨料做预处理;同时,使用高强度SC制备再生细骨料取代河砂,可保证再生砂浆达到与普通砂浆相似的力学性能.

关 键 词：fine recycled concrete aggregates (FRCA) recycled mortar with FRCA source concrete (SC) strength compressive strength flexural strength uniaxial compressive stress-strain test 

分 类 号：TU528[建筑科学—建筑技术科学]