Effect of water absorption of SAP on the rheological properties of cement-based materials with ultra-low w/b ratio

被引：78
作者：
Ma, Xianwei [1 ]
Yuan, Qiang [2 ]
Liu, Jianhui [3 ]
Shi, Caijun [3 ]
机构：
[1] Henan Univ Urban Construct, Sch Civil & Transport Engn, Pingdingshan 467036, Peoples R China
[2] Cent S Univ, Sch Civil Engn, Natl Engn Lab High Speed Rail Construct, Changsha 410075, Hunan, Peoples R China
[3] Hunan Univ, Key Lab Green & Adv Civil Engn Mat & Applicat Tec, Changsha 410082, Hunan, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2019年 / 195卷
关键词：
SAP; Cement mortar; Particle size; Rheology; Water absorption; Concrete; SUPERABSORBENT POLYMERS SAPS; PORE STRUCTURE; YIELD-STRESS; MORTARS; THIXOTROPY; SHRINKAGE; MICROSTRUCTURE; HYDRATION; CONCRETE; STRENGTH;
D O I：
10.1016/j.conbuildmat.2018.11.050
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Superabsorbent polymer (SAP) is an important internal curing agent for concrete with low or ultra-low water-to-binder ratio (w/b). When SAP is added, it will absorb water from fresh concrete fast. Thus, water absorption of SAP will affect the rheological properties of cement-based materials, especially at low w/b. Moreover, SAP with different particle size has a different absorption rate which will also affect the rheological properties. In this paper, two SAPs with different particle size are used to investigate its effects on the maximum shear stress, yield stress, plastic viscosity and thixotropy of cement-based materials within 80 min. Basic w/b of 0.18 was specified as reference values. Rheological results show that the absorption of SAP changed the evolution of yield stress, plastic viscosity and thixotropy of fresh mortar with time. Large SAP's particles led to a high absorption rate and a long absorption time which increased the yield stress and plastic viscosity. The above effects of SAP are closely related to the availability of water near SAP in cement mortar which causes to be a nonlinear relationship between the amounts of SAP and extra water required. In addition, the amount of extra water should be adjusted according to particle size of SAP and the addition level of SAP. (C) 2018 Elsevier Ltd. All rights reserved.
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收藏
页码：66 / 74
页数：9
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