摘要
通过再生混凝土早龄期基本拉伸徐变试验,研究品质不同的再生粗骨料、取代率不同的再生粗、细骨料和再生细骨料水洗预处理法对混凝土早龄期基本拉伸徐变的影响。试验结果表明:随着再生粗骨料、细骨料的取代率的增加,再生混凝土早龄期基本拉伸徐变随之增大;再生混凝土的早龄期基本拉伸徐变随再生混凝土中实际天然骨料体积含量的增大而减小;再生细骨料水洗预处理法降低了再生混凝土的早龄期基本拉伸徐变,降低幅度为4.1%~7.9%。引入混凝土中实际天然骨料体积含量和再生细骨料取代率等参数,对现有的混凝土基本拉伸徐变预测模型M-Burgers进行修正,得到适用于再生混凝土早龄期拉伸徐变预测的模型。
Experimental tests on specimens of recycled concrete at early ages are conducted to examine how its basic tensile creep varies with recycled coarse aggregate of different quality, recycled coarse and fine aggregate of different replacement rates, and pre-cleaning of recycled fine aggregate. Test results show that this creep increases with the replacement rate but decreases with the volume fraction of natural aggregate, and that pre-cleaning of recycled fine aggregate is an effective way to reduce the creep by 4.1% ~ 7.9%. Our calculations and analysis demonstrate that by introducing parameters representing the volume of natural aggregate and replacement rate of recycled fine aggregate, a model for prediction of the basic tensile creep of recycled concrete at early ages can be constructed through certain modification on the MBurgers model that is limited to the basic tensile creep prediction of normal concrete.
作者
黄海生
郑建岚
罗素蓉
HUANG Haisheng;ZHENG Jianlan;LUO Surong(College of Civil Engineering, Fuzhou University, Fuzhou 350116;Fujian Jiangxia University, Fuzhou 350108;Fujian 2011 Collaborative Innovation Center of Environmental Protection in High Performance Concrete, Fuzhou 350108;College of Civil Engineering, Putian University, Putian, Fujian 351100)
出处
《水力发电学报》
EI
CSCD
北大核心
2018年第6期112-120,共9页
Journal of Hydroelectric Engineering
基金
国家自然科学基金海峡联合基金重点支持项目(U1605242)
国家自然科学基金(51578153)
关键词
再生混凝土
基本拉伸徐变
再生粗骨料
再生细骨料
预测模型
早龄期
recycled aggregate concrete
basic tensile creep
recycled coarse aggregate
recycled fineaggregate
prediction model
early age
