为研究再生骨料混凝土在单轴受压情况下的本构关系,以某道路废弃混凝土作为再生骨料,制作了45个尺寸为150 mm×150 mm×300 mm的棱柱体试件,研究再生骨料混凝土在不同取代率、不同水灰比下的单轴受压应力-应变关系,建立了再生骨料混凝土的本构关系。结果表明:随着再生骨料取代率的增加,再生骨料混凝土的峰值应力fc整体呈先减小、后小幅度增大再减小的变化趋势;峰值应变ε0整体呈先增大、后减小的变化趋势;随着水灰比的增加,峰值应力fc由于取代率的不同而呈现不同的变化趋势,但总体上呈下降趋势;峰值应变ε0基本均呈先增大、然后基本不变或略微减小的趋势。总体而言,再生骨料混凝土的峰值应力略小于天然混凝土,再生骨料混凝土的应变略大于天然混凝土。研究成果可为再生骨料混凝土的推广应用提供技术支持和参考。
Abstract
The constitutive relation of recycled aggregate concrete was constructed based upon the stress-strain relation under uniaxial compression with varying replacement ratio of recycled aggregate and water-cement ratio. With road waste concrete as recycled aggregate, 45 prismatic specimens with dimensions of 150 mm×150 mm×300 mm were prepared for test. Results unveiled that with the increase of the replacement ratio of recycled aggregate, the peak stress fc of recycled aggregate concrete declined at first, and then climbed slightly but decreased afterwards; peak strain ε0 augmented firstly and then decreased. With the increase of water-cement ratio, peak stress fc presented different variation trends—yet in general a decline trend—due to varied replacement ratio; peak strain ε0 increased firstly and then remained unchanged or decreased slightly. In general, the peak stress of recycled aggregate concrete is slightly smaller than that of natural concrete, and strain slightly greater than that of natural concrete. The research results offer technical support and reference for the popularization and application of recycled aggregate concrete.
关键词
再生骨料混凝土 /
取代率 /
水灰比 /
单轴受压 /
本构关系
Key words
recycled aggregate concrete /
replacement rate /
water-cement ratio /
uniaxial compression /
constitutive relation
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 李文贵,龙 初,罗智予,等.再生骨料混凝土破坏机理与改性研究综述[J].建筑科学与工程学报,2016,33(6):60-72.
[2] HUANG Yi-jie, HE Xu-jia, WANG Qing, et al. Mechanical Properties of Sea Sand Recycled Aggregate Concrete under Axial Compression[J]. Construction and Building Materials, 2018, 175: 55-63.
[3] 肖建庄.再生混凝土[M].北京:中国建筑工业出版社,2008.
[4] 姚宇峰,金宝宏,章海刚,等.再生粗骨料替代率对再生混凝土力学性能影响[J].广西大学学报(自然科学版), 2016,41(4):1187-1193.
[5] ABDEL-HAY A S. Properties of Recycled Concrete Aggregate under Different Curing Conditions[J]. HBRC Journal, 2017, 13(3): 271-276.
[6] 周静海,何海进,孟宪宏,等.再生混凝土基本力学性能试验[J].沈阳建筑大学学报(自然科学版),2010, 26(3):464-468.
[7] 张波志,王社良,张 博,等.再生混凝土基本力学性能试验研究[J].混凝土,2011(7):4-6.
[8] OLORUNSOGO F T, PADAYACHEE N. Performance of Recycled Aggregate Concrete Monitored by Durability Indexes[J]. Cement and Concrete Research, 2002, 32(2): 179-185.
[9] KHATIB J M. Properties of Conctete Incorporating Fine Recycled Aggregate[J].Cement and Concrete Research, 2005,35(4):763-769.
[10]肖建庄,李佳彬,孙振平,等.再生混凝土的抗压强度研究[J].同济大学学报(自然科学版),2004,32(12):1558-1561.
[11]XIAO Jian-zhuang,LI Long,SHEN Lu-ming,et al. Effects of Strain Rate on Mechanical Behavior of Modeled Recycled Aggregate Concrete under Uniaxial Compression[J].Construction and Building Materials,2015,93:214-222.
[12]肖建庄.再生混凝土单轴受压应力-应变全曲线试验研究[J]. 同济大学学报(自然科学版),2004,35(11):1445-1449.
[13]陈宗平,徐金俊,郑华海,等.再生混凝土基本力学性能试验及应力应变本构关系[J].建筑材料学报,2013,16(1):24-32.
[14]TOPCU I B, GUNCAN N F. Using Waste Concrete as Aggregate[J]. Cement and Concrete Research, 1995, 25(7): 1385-1390.
[15]FOLINO P, XARGY H. Recycled Aggregate Concrete—Mechanical Behavior under Uniaxial and Triaxial Compression[J]. Construction and Building Materials, 2014, 56(3): 21-31.
[16]过镇海.混凝土的强度和变形:试验基础和本构关系[M].北京:清华大学出版社,1996.
PDF(6390 KB)
