Retardation mechanism of anionic asphalt emulsion on the hydration of Portland cement

被引：39

作者：

Li, Wei ^{[1
,2
,3
,4
]}

Hong, Jinxiang ^{[3
]}

Zhu, Xiaobin ^{[3
]}

Yang, Dingyi ^{[2
]}

Bai, Yun ^{[4
]}

Liu, Jiaping ^{[1
,3
,4
]}

Miao, Changwen ^{[1
,3
]}

机构：

[1] Southeast Univ, Sch Mat Sci & Engn, Nanjing, Jiangsu, Peoples R China

[2] Yangzhou Univ, Coll Civil Sci & Engn, Green Bldg Mat Inst, Yangzhou, Jiangsu, Peoples R China

[3] State Key Lab High Performance Civil Engn Mat, Nanjing, Jiangsu, Peoples R China

[4] UCL, Adv & Innovat Mat AIM Grp, London, England

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2018年 / 163卷

基金：

中国国家自然科学基金;

关键词：

Anionic asphalt emulsion; Cement hydration; Retardation; Water reactivity; HYDROGEN-BONDS; SILICATE; WATER; MODULUS; MORTAR; SUPERPLASTICIZER; ELASTICITY; ADSORPTION; STRENGTH; DROPLETS;

D O I：

10.1016/j.conbuildmat.2017.12.150

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Cement-asphalt (CA) mortar, a grouting material consisting of Portland cement (PC), asphalt emulsion, sand, water and other related admixtures, has been widely used as a cushion layer material in the construction of High-Speed Railways (HSR) during the past decade in China due to its excellent damping property. The fresh and hardened properties of CA mortar are closely related to the PC hydration in the presence of asphalt emulsion. However, the retardation effect introduced by the anionic asphalt emulsion on the hydration process of PC has not been fully understood. In this paper, the effect of an anionic asphalt emulsion on the early hydration process of CA paste was first investigated by setting time test, isothermal conduction calorimeter and electrical resistivity. The MIP and SEM were then employed to characterize the microstructure evolution of the CA paste. Based on the data and observation obtained from the experimental study, three possible retardation mechanisms introduced by the anionic asphalt emulsion on the PC hydration were then assessed in this paper, including (i) selective adsorption by anionic emulsifier via electrostatic attraction, (ii) coating formed by the demulsification of anionic asphalt emulsion, and (iii) reduced reactivity of water molecules in anionic asphalt emulsion. Crown Copyright (C) 2017 Published by Elsevier Ltd. All rights reserved.

引用

页码：714 / 723

页数：10

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