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基于等效龄期的再生细粉混凝土成熟度研究 认领

Study on maturity of recycled-fine-powder concrete based on equivalent age
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摘要 为了研究温度-时间对再生细粉混凝土力学性能的影响,对各类成熟度计算方法进行了比较。利用标准养护条件下龄期与抗压强度的关系曲线,建立了混凝土成熟度-抗压强度模型。试验结果表明,标准养护条件下,C30再生细粉混凝土的抗压强度早期增长较快,中后期(≥7 d)强度发挥率稍低于普通混凝土,早期成熟度对抗压强度的影响作用与普通混凝土相同;再生细粉可促进C40混凝土早中期(≤7 d)强度发展,其早期成熟度对抗压强度的影响作用高于普通混凝土。以自然养护状态下的等效龄期作为成熟度推算的C30和C40再生细粉混凝土早期强度值与实际测定值偏差分别小于8%和4%,因此等效龄期法作为成熟度来估算再生细粉混凝土早期强度不失为一种方便而有效的方法。 In order to study the effect of temperature-time on the mechanical properties of the recycled fine powder concrete,the calculation methods of the maturity were compared.The model of the concrete maturity-compressive strength was established by the age-strength relation in the standard curing condition.The experimental results showed that the compressive strength increasing of recycled fine powder concrete C30 in the early stage was more rapidly,the strength in the medium and later periods(≥7d)was slightly lower than that of ordinary concrete,and the effect of the early maturity on the compressive strength was the same as that of ordinary concrete.The strength development of the concrete C40 was promoted by the recycled fine powder in the early and medium period(≤7d),and the effect of early maturity on the compressive strength was higher than that of ordinary concrete.The early strength value of the recycled-fine-powder concrete C30 and C40 were less 8%and 4%respectively than the actual measured value.The equivalent age method is a convenient and effective method as maturity to estimate the early strength of recycled-fine-powder concrete.
作者 彭春元 张小鹏 余斌 彭景元 焦楚杰 ENG Chunyuan;ZHANG Xiaopeng;YU Bin;PENG Jingyuan;JIAO Chujie(School of Civil Engineering,Guangzhou University,Guangzhou 510006,China;Green Building Materials Engineering Technology Research Center,Guangzhou University,Guangzhou 510006,China;Guangzhou Yinyu Environmental Protection Building Materials Co.,Ltd.,Guangzhou 511450,China)
出处 《混凝土》 CAS 北大核心 2020年第1期22-26,共5页 Concrete
基金 国家自然科学基金项目(51778158) 广东省水利科技创新重点项目(2017-32)。
关键词 等效龄期 成熟度 再生细粉混凝土 抗压强度 equivalent age maturity recycled-fine-powder concrete compressive strength
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