Study on Constrained Shrinkage and Crack Resistance of High Workability and High Strength Lightweight Aggregate Concrete

被引：0

作者：

Zhang D. ^{[1
]}

Jiang X. ^{[1
]}

机构：

[1] School of Hydraulic Engineering, Changsha University of Science and Technology, Changsha

来源：

Tiedao Xuebao/Journal of the China Railway Society | 2021年 / 43卷 / 05期

关键词：

Constraint shrinkage; Crack resistance; High workability; HSLC; Ring test;

D O I：

10.3969/j.issn.1001-8360.2021.05.023

中图分类号：

学科分类号：

摘要：

In order to explore the constrained shrinkage and crack resistance of high workability and high strength lightweight aggregate concrete (HSLC), high strength shale ceramsite, fly ash and silica fume were used to prepare HSLC with good performance, to test its basic mechanical properties and to study the restrained shrinkage cracking behavior of HSLC through the ring-constrained shrinkage test under the dry condition of the outer surface. The experimental results show that: Compared with normal concrete (NC), the shrinkage strain and strain growth rate of HSLC during the first 7 days are obviously higher than those of NC. After 7 days, the shrinkage strain growth of HSLC slows down, and the total shrinkage strain of HSLC during cracking is obviously smaller than that of normal concrete. Fly ash can obviously improve the performance of fresh HSLC paste and reduce the shrinkage strain of HSLC, but its content should be controlled within 25%. Silica fume composite, beneficial to the improvement of the strength of HSLC, can significantly increase the shrinkage deformation of concrete.Compared with NC of the same strength grade, HSLC has smaller risk factor of early cracking, but its cracking resistance is better than HSLC from the point of bearing capacity of concrete. Fly ash alone can reduce the cracking risk factor of confined shrinkage of concrete. The risk factor of early cracking of concrete mixed with fly ash and silica fume is obviously greater than that of concrete with fly ash alone. The pre-wetting of soil and lightweight aggregate can greatly improve the crack resistance of concrete. © 2021, Department of Journal of the China Railway Society. All right reserved.

引用

页码：190 / 196

页数：6

共 20 条

[1] LI J J, CHEN Y H, WAN C J., A Mix-design Method for Lightweight Aggregate Self-compacting Concrete Based on Packing and Mortar Film Thickness Theories, Construction and Building Materials, 157, pp. 621-634, (2017)
[2] RADLINSKA A, KASZYNSKA M, ZIELINSKI A, Et al., Early-age Cracking of Self-consolidating Concrete with Lightweight and Normal Aggregates, Journal of Materials in Civil Engineering, 30, 10, (2018)
[3] GAO Yingli, LONG Jie, LIU He, Et al., Study on Early Autogenous Shrinkage and Crack Resistance of Fly Ash High-strength Lightweight Aggregate Concrete, Bulletin of the Chinese Ceramic Society, 32, 6, pp. 1151-1156, (2013)
[4] AKGUNGOR A P, SEVIM O, KALKAN I, Et al., Restrained Shrinkage Cracking of Self-consolidating Concrete Roads, Science and Engineering of Composite Materials, 25, 5, pp. 1021-1030, (2018)
[5] AKHNOUKH A K., Internal Curing of Concrete Using Lightweight Aggregates, Particulate Science and Technology, 36, 3, pp. 362-367, (2018)
[6] CORTAS R, ROZIERE E, STAQUET S, Et al., Effect of the Water Saturation of Aggregates on the Shrinkage Induced Cracking Risk of Concrete at Early Age, Cement and Concrete Composites, 50, pp. 1-9, (2014)
[7] XIE T, FANG C, MOHAMAD ALI M S, Et al., Characterizations of Autogenous and Drying Shrinkage of Ultra-high Performance Concrete (UHPC): an Experimental Study, Cement and Concrete Composites, 91, pp. 156-173, (2018)
[8] DEMIRI, SEVIM O, TEKIN E., The Effects of Shrinkage-reducing Admixtures Used in Self-compacting Concrete on Its Strength and Durability, Construction and Building Materials, 172, pp. 153-165, (2018)
[9] ZHANG Dengxiang, YANG Weijun, Theoretical and Experimental Study on Early Restrained Shrinkage Cracking of Concrete, Journal of the China Railway Society, 33, 2, pp. 101-106, (2011)
[10] NIKNEZHAD D, KAMALI-BERNARD S, MESBAH H A., Self-compacting Concretes with Supplementary Cementitious Materials: Shrinkage and Cracking Tendency, Journal of Materials in Civil Engineering, 29, 7, (2017)

← 1 2 →