摘要
为了研究非连续级配再生粗骨料自密实混凝土的工作性能,采用控制变量法,研究了再生粗骨料取代率、砂率和经时损失对其工作性能的影响。试验结果表明:非连续级配的再生粗骨料可以配制出满足工作性能要求的自密实混凝土。当再生粗骨料取代率为50%时工作性能最好;当砂率为45%时,新拌混凝土的工作性能最好;随着时间的延长,新拌混凝土工作性能下降,添加适量的聚羧酸高性能减水剂可以恢复其坍落扩展度;给出的坍落扩展度经时损失公式计算简单,计算结果准确,可以作为新拌混凝土经时损失评价的参考。
In order to study the workability of self-compacting concrete with discontinuous gradation recycled coarse aggregate the influence of regeneration aggregate,sand rate and gradual loss are researched with the control variable method.The results indicate that self-compacting concrete with discontinuous gradation recycled coarse aggregate can be produced.When the coarse aggregate is replaced with 50% recycled concrete aggregates and sand rate is 45%,the workability of self-compacting concrete is best.The workability of self-compacting concrete declines with the extension of time.Added the right amount of polycarboxylate superplasticizer can restore the slump flow.The gradual loss of slump flow is expressed by a simple formula proposed,which can be a reference on the evaluation of gradual loss of slump flow.
出处
《混凝土》
CAS
CSCD
北大核心
2014年第10期109-113,共5页
Concrete
基金
江苏省研究生实践创新计划(SJLX_0496)
江苏省高校自然科学研究项目(14KJB560006)
江苏省本科生创新计划(201413991003Y)
江苏科技大学青年教师科研项目(112110142)
关键词
自密实混凝土
再生混凝土
工作性能
非连续级配骨料
self-compacting concrete
recycled concrete
workability
discontinuous coarse aggregate
