The effect of calcium lignosulfonate on ettringite formation in cement paste

被引：60
作者：
Colombo, A. [1 ]
Geiker, M. [1 ]
Justnes, H. [2 ,3 ]
Lauten, R. A. [4 ]
De Weerdt, K. [1 ]
机构：
[1] Norwegian Univ Sci & Technol, NTNU, Dept Struct Engn, Trondheim, Norway
[2] SINTEF Bldg & Infrastruct, Trondheim, Norway
[3] Norwegian Univ Sci & Technol, NTNU, Dept Mat Sci & Engn, Trondheim, Norway
[4] Borregaard, Sarpsborg, Norway
来源：
CEMENT AND CONCRETE RESEARCH | 2018年 / 107卷
关键词：
Ettringite; Hydrated surface area; Adsorption; Fresh cement paste; Lignosulfonate; PORTLAND-CEMENT; SUPERPLASTICIZERS; HYDRATION; TIME; ADSORPTION; STABILITY; RHEOLOGY;
D O I：
10.1016/j.cemconres.2018.02.021
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The effect of a softwood calcium lignosulfonate, LSs, on the ettringite formed in cement paste was investigated. Two Portland cements, mainly differing in surface area and C(3)A content, were used. The effect of LSs addition time was studied, by adding either the LSs immediately with the mixing water or after 10 min of hydration. After 30 min of hydration of both cement pastes, the immediate addition of LSs caused the formation of numerous small ettringite crystals. The ettringite crystals had similar shape in pastes with and without LSs addition: cubic or cuboidal shape with length between 0.1 and 0.4 mu m. These small particles caused an increase in surface area, which in turn increased the LSs adsorption by the cement paste. This could potentially lead to incompatibility issues between cement and plasticizer.
引用
收藏
页码：188 / 205
页数：18
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