Effects of re-curing on residual mechanical properties of concrete after high temperature exposure

被引：54

作者：

Akca, Abdullah Huzeyfe ^{[1
,2
]}

Ozyurt, Nilufer ^{[1
]}

机构：

[1] Bogazici Univ, Dept Civil Engn, TR-34342 Bebek, Turkey

[2] Yildiz Tech Univ, Dept Civil Engn, TR-34220 Esenler, Turkey

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2018年 / 159卷

关键词：

High temperature; Fiber reinforced concrete; Recovery; Deterioration; Air entrainment; HIGH-STRENGTH CONCRETE; HIGH-PERFORMANCE CONCRETE; FIRE-DAMAGED CONCRETE; CEMENT PASTE; COMPRESSIVE STRENGTH; THERMAL-CONDUCTIVITY; ELEVATED-TEMPERATURE; BEHAVIOR; MICROSTRUCTURE; CARBONATION;

D O I：

10.1016/j.conbuildmat.2017.11.005

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Physical and mechanical changes in concrete continue in subsequent days of heating since some chemically active products in concrete give reactions with water and carbon dioxide in air and new formations determine the fate of concrete. Therefore, this study was conducted to understand the effects of mineral admixtures, fiber reinforcement, air entrainment and different re-curing regimes (after heating) on residual properties of concrete. Concrete specimens were heated to 1000 C then water and air re-curing processes were applied on heated specimens and further deterioration and recovery of concrete were evaluated. New cracks occurred on the heated surfaces during air re-curing period and reduction in mechanical properties was observed while water re-cured specimens kept their stabilities and regain in their mechanical properties was obtained. Moreover, micro level investigations were conducted on heated surfaces of air re-cured and water re-cured concrete specimens for understanding the reasons of changes observed in mechanical properties. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：540 / 552

页数：13

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