Microscopic assessment of recycled concrete aggregate (RCA) mixtures affected by alkali-silica reaction (ASR)

被引：19
作者：
Trottier, Cassandra [1 ]
Zahedi, Andisheh [1 ]
Ziapour, Rouzbeh [1 ]
Sanchez, Leandro [1 ]
Locati, Francisco [2 ]
机构：
[1] Univ Ottawa, Dept Civil Engn, 161 Louis Pasteur Private, Ottawa, ON K1N 6N5, Canada
[2] CICTERRA CONICET UNC, Av Velez Sarsfield 1611,X5016GCA, Cordoba, Argentina
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2021年 / 269卷
基金：
加拿大自然科学与工程研究理事会;
关键词：
Alkali-silica reaction (ASR); Recycled concrete aggregates (RCA); Damage; Microscopic assessment; Damage Rating Index (DRI); DAMAGE; AAR; STRENGTH;
D O I：
10.1016/j.conbuildmat.2020.121250
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Recycled concrete aggregates (RCA) are deemed an efficient approach to reduce waste yet, the presence of previous alkali-silica reaction (ASR) causes reservations towards its use in new construction. In this work, RCA specimens are manufactured in the laboratory incorporating RCA displaying distinct ASR past deteriorations (i.e. slight and severe). The samples are stored in conditions enabling further ASR development and monitored over time. Three levels of "secondary" expansion are selected for analysis, and upon being reached, microscopic evaluations are conducted through the Damage Rating Index (DRI). Results revealed that lower distress is observed in the RCA mixtures when compared to a companion conventional concrete at the same expansion level. Moreover, the damage mechanism of ASR-affected RCA concrete seems dependent on the RCA past deterioration since cracks tend to propagate into the residual cement paste or new cement paste for mixtures made of slightly or severely damaged RCA, respectively. (C) 2020 Elsevier Ltd. All rights reserved.
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页数：15
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