Early-age and long-term strength development of high-performance concrete with SAP

被引：33

作者：

Olawuyi, Babatunde J. ^{[1
]}

Babafemi, Adewumi J. ^{[2
]}

Boshoff, William P. ^{[3
]}

机构：

[1] Fed Univ Technol, Sch Environm Technol, Dept Bldg, PMB 64, Minna, Niger, Nigeria

[2] Stellenbosch Univ, Dept Civil Engn, Stellenbosch, South Africa

[3] Univ Pretoria, Dept Civil Engn, Pretoria, South Africa

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2021年 / 267卷

关键词：

Superabsorbent polymers (SAP); High-performance concrete; Compressive strength; Binder type; Curing age; AUTOGENOUS SHRINKAGE;

D O I：

10.1016/j.conbuildmat.2020.121798

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Internal curing of high-performance concrete (HPC) by the addition of Superabsorbent Polymers (SAP) has been proven to be effective in mitigating autogenous shrinkage. The issues of concern in research, however, is the extent to which strength development is impacted by the voids created by SAP as cement hydrates with age. In this study, the influence of SAP content, size, binder type, water/binder ratio (W/B) and curing age on the early-age and long-term strength development of a low W/B HPC was examined. HPC mixtures designed for a minimum 28-day target cube strength of 70 MPa (i.e. C55/67 - C100/115) were studied with 25 g/g extra water provided for SAP absorption. Mortar (50 mm) and concrete (100 mm) cubes were cast and cured in water for different hydration periods. The results reveal that the compressive strength of the HPC mixtures decreased slightly (both for the early-age and long-term) as SAP content increased. Statistical examination of the results further revealed that W/B and SAP contents significantly influenced the strength development while a simulation of the SAP's water absorption into Powers' Model show compatibility for prediction of strength development trends in HPC with SAP. (C) 2020 Elsevier Ltd. All rights reserved.

引用

页数：13

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