再生混凝土基本力学性能试验  

Basic Mechanical Properties of Recycled Concrete Experimental Study

作　　者：周静海[1] 何海进[2] 孟宪宏[2] 杨有志[2] 

机构地区：[1]沈阳建筑大学建筑节能研究院,辽宁沈阳110168 [2]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2010年第3期464-468,共5页Journal of Shenyang Jianzhu University：Natural Science

基　　金：住房和城乡建设部科技攻关项目(06-6-8);辽宁省自然科学基金项目(20082010)

摘　　要：目的研究再生骨料混凝土和普通混凝土在基本力学性能方面的差异.方法采用人工破碎的方式把废弃的混凝土破碎后,利用水泥浆浸泡再生骨料,参照普通混凝土配合比设计方法配置再生混凝土,对再生骨料取代率分别为0、30%、50%、80%的混凝土进行试验.结果再生混凝土的抗压强度、弹性模量、劈裂抗拉强度相对普通混凝土均有所降低,其中立方体试块破坏形态和普通混凝土相似,均为粗骨料和水泥凝胶体面之间的粘结破坏.应力-应变曲线与普通混凝土相似.结论再生骨料的取代率为50%时,可以获得较高的抗压强度,不宜采用《混凝土结构设计规范》的计算公式计算再生混凝土的抗拉强度和弹性模量,提出了再生混凝土抗拉强度和弹性模量的计算公式.This paper aimed at mainly studies the basic mechanical properties differences between recycled aggregate concrete and coarse aggregate,its way adopt soaking slurry and ordinary concrete,after selecting the artificial method to make the recycled aggregate,artificial crumb abandoned broken concrete,taking into account ordinary concrete mixing design method,applying the recycled aggregate replacement rates were 0,30%,50%,80% of the basic mechanical properties of concrete to tests.The results prove the tensile strength,elastic modulus,splitting tensile strength of the recycled aggregate concrete are relatively reduce,as common in the failure modes of cube test block and ordinary concrete,both the gel decent damage between coarse aggregate and cement bond,stress-strain curve similar to ordinary concrete.The conclusions show that when the recycled aggregate replacement rate at 50%,get higher compressive strength,then should not adopt the calculation formula of＂design of concrete structures＂to account tensile strength and elastic modu-lus of the recycled concrete,we present formula of recycled concrete tensile strength and elastic modulus.

关 键 词：再生混凝土 水泥浆 抗压强度 弹性模量 劈裂抗拉强度 

分 类 号：TU375[建筑科学—结构工程]