Early-age mesoscale deformation in lightweight aggregate concrete under different water-to-cement ratios and pretreated methods

IF 4.4 3区工程技术 Q1 ENGINEERING, CIVIL

Archives of Civil and Mechanical Engineering Pub Date : 2024-11-29 DOI:10.1007/s43452-024-01099-x

Miao Hong, Dong Lei, Zhaohang Wan, Feipeng Zhu, Pengxiang Bai, Feng Hu

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Abstract

This paper primarily investigates the deformation behavior of lightweight aggregate concrete (LWAC) with lightweight expanded clay aggregate (LECA) at early ages. Comparative experiments were conducted on specimens prepared with pre-wetted and dry aggregates and with different water-to-cement ratios. The digital image correlation (DIC) technique was used to measure deformation and calculate the principal strains on the surface of specimens. The variation of global strains and local strains in mortar and aggregates at early ages were analyzed. The results showed that pre-wetted lightweight aggregates can enhance the effect of internal curing, thereby reducing the early-age shrinkage of concrete, and weakening the discreteness of strain distribution in concrete, thus theoretically reducing the risk of cracking. The minimum principal strains of mortar and aggregates did not exhibit a simultaneous increase and decrease trend, but rather interacted with each other, and reached a dynamic equilibrium with moisture transfer between them. The maximum principal strains of aggregate were significantly greater than those of mortar. The effectiveness of internal curing does not increase linearly with an increase in the water-to-cement ratio, but first increases and then decreases, with the optimal internal curing effect achieved around a water-to-cement ratio of 0.40 at early ages.

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不同水灰比和预处理方法下轻骨料混凝土早期中尺度变形

本文主要研究了掺有轻质膨胀粘土骨料的轻骨料混凝土（LWAC）早期变形行为。对预湿骨料和干骨料以及不同水灰比制备的试件进行了对比试验。采用数字图像相关（DIC）技术测量试件表面的变形并计算其主应变。分析了砂浆和骨料早期整体应变和局部应变的变化规律。结果表明：预湿轻集料可增强混凝土内部养护效果，从而减少混凝土早期收缩，减弱混凝土内部应变分布的离散性，理论上降低混凝土开裂风险。砂浆和集料的最小主应变并没有同时增减的趋势，而是相互作用，达到动态平衡，二者之间存在水分传递。骨料的最大主应变显著大于砂浆的主应变。内养护效果不随水灰比的增加而线性增加，而是先增加后降低，早期龄期水灰比为0.40左右时内养护效果最佳。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Archives of Civil and Mechanical Engineering 工程技术-材料科学：综合

CiteScore

6.80

自引率

9.10%

发文量

201

审稿时长

4 months

期刊介绍： Archives of Civil and Mechanical Engineering (ACME) publishes both theoretical and experimental original research articles which explore or exploit new ideas and techniques in three main areas: structural engineering, mechanics of materials and materials science. The aim of the journal is to advance science related to structural engineering focusing on structures, machines and mechanical systems. The journal also promotes advancement in the area of mechanics of materials, by publishing most recent findings in elasticity, plasticity, rheology, fatigue and fracture mechanics. The third area the journal is concentrating on is materials science, with emphasis on metals, composites, etc., their structures and properties as well as methods of evaluation. In addition to research papers, the Editorial Board welcomes state-of-the-art reviews on specialized topics. All such articles have to be sent to the Editor-in-Chief before submission for pre-submission review process. Only articles approved by the Editor-in-Chief in pre-submission process can be submitted to the journal for further processing. Approval in pre-submission stage doesn''t guarantee acceptance for publication as all papers are subject to a regular referee procedure.