BEIJING JIAOTONG UNIVERSITY I TSINGHUA UNIVERSITY BEIJING

Flowability and microstructure of fresh ­cement pastes in the presence of superplasticizer, latex and asphalt emulsion

1 Particle size distribution curve of the cement used in this study All authors
2 The variation of flowability of FCPs with the addition of different additives
3 Schematic illustration of the effects of additives of different sizes on the microstructure of fresh cement pastes at varied addition levels
4 ESEM images of the FCPs 5 min after mixing [16]
5 Optical images of the structure of cement grains in cement suspensions
6 Influence of three types of additives on the particle size distribution of cement ­suspensions
7 ESEM images of the FCPs with latex 5 min after mixing
8 Optical images of the organizational structure of cement grains in the cement suspensions with latex
9 ESEM images of the FCPs containing asphalt emulsion 5 min after mixing
10 Optical images of the organizational structure of cement grains and asphalt particles in cement suspensions containing 10 % asphalt
11 2-D images of blank fresh cement paste (a) and asphalt emulsion (b)
12 Laser scanning images of the blank FCP: a), b), c) and the pastes containing asphalt emulsion at an A/C of 0.35 d), e), f)
13 Laser scanning images of FCPs containing asphalt emulsion at an A/C of 0.6 a), b), c) and an A/C of 1.0 d), e), f)

This study investigated the effects of polycarboxylate superplasticizer, poly(styrene-acrylate) latex and asphalt emulsion, which range in molecular/particle size from nanometres to microns, on the microstructure and flowability of fresh cement pastes (FCPs).

1 Introduction

High performance concrete (HPC) is widely used in the construction industry at present due to its excellent properties [1]. The improved properties of HPC are closely related to the various additives that are incorporated in the concretes and mortars to achieve the desired properties. Superplasticizers are usually used to reduce the water/cement ratio (W/C) with the aim of enhancing the strength and durability of the concrete in order to satisfy the construction requirements [2–6]. Polymer latexes are often employed as cement mortar and concrete modifiers to improve the...

TEXT Zhang Yanrong and Cai Xiaopei, Beijing Jiaotong University, Department of Civil Engineering, ­Beijing/China; Kong Xiangming, Tsinghua University, Department of Civil Engineering, Beijing/China
Corresponding authors: Cai Xiaopei, Kong Xiangming
This article appeared in

ZKG 12/2017

This article appeared in

ZKG 12/2017

Ressort:  Application
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