地聚物再生混凝土抗压强度的离散性分析  

Investigation on Compressive Strength Dispersion of Geopolymeric Recycled Aggregate Concrete

作　　者：周宏元 母崇元 王小娟 李润琳 曹万林[1] ZHOU Hongyuan;MU Chongyuan;WANG Xiaojuan;LI Runlin;CAO Wanlin(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China;State Key Laboratory of Explosion Science and Safety Protection,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京工业大学城市与安全减灾教育部重点实验室,北京100124 [2]北京理工大学爆炸科学与安全防护国家重点实验室,北京100081

出　　处：《材料导报》2025年第1期210-217,共8页Materials Reports

基　　金：国家自然科学基金(52278477;52178096);国家重点研发计划(2019YFD1101005)。

摘　　要：为研究地聚物再生混凝土(Geopolymeric recycled aggregate concrete, GRAC)试件尺寸及再生粗骨料(Recycled coarse aggregate, RCA)替代率对其抗压强度离散性的影响,制备了五种RCA替代率(0%、30%、50%、70%和100%)、四种宽度(70 mm、100 mm、150 mm和200 mm)长宽比均为3的试件。基于经典尺寸效应律,提出了考虑RCA替代率的GRAC平均抗压强度尺寸效应预测公式,试验数据表明GRAC抗压强度的离散性随试件尺寸增大而减小,随RCA替代率的增加而先增大后减小。此外,基于Weibull分布模型,提出了任意保证率下具有不同RCA替代率的GRAC抗压强度尺寸效应预测公式。Prismatic geopolymeric recycled aggregate concrete(GRAC)specimens with a height-to-width ratio of 3 were prepared for the quasi-static compressive test.The specimens were designed with four different widths(70 mm,100 mm,150 mm,and 200 mm)and five distinct RCA replacement rates(0%,30%,50%,70%,and 100%)to explore the influence of specimen size and recycled coarse aggregate(RCA)substitute rate on the compressive strength dispersion of GRAC.A predictive formula for the average compressive strength of different sizes of GRAC,con-sidering the RCA substitute rate,was proposed based on the classical size effect law.The results showed that the compressive strength disper-sion of GRAC decreased with an increase of specimen width.Furthermore,it was observed that the compressive strength dispersion of GRAC ini-tially increased and then decreased as the RCA substitute rate increased.Additionally,a predictive formula for the compressive strength of GRAC with varying sizes and differentRCA substitute rates,considering arbitrary reliability levels,was proposed based on the Weibull distribution model.

关 键 词：地聚物再生混凝土 抗压强度离散性 再生粗骨料替代率 尺寸效应 WEIBULL分布 

分 类 号：TU528[建筑科学—建筑技术科学]