Effect of agitation during the early-age hydration on thixotropy and morphology of cement paste

IF 3.4 3区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Materials and Structures Pub Date : 2024-11-12 DOI:10.1617/s11527-024-02504-w
Kun Zhang, Alexander Mezhov, Wolfram Schmidt
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Abstract

The effect of agitation during the early-age hydration on thixotropy and morphology of cement paste prepared with and without superplasticizers (SP) is investigated by applying penetration test, small amplitude oscillatory shear sweep test (SAOS), isothermal calorimetric test, scanning electron microscopy (SEM) and energy dispersive X-ray analyses (EDX). The results show that the agitation of cement paste during the induction period increases the heat flow rate and destroys existing structures of samples without changing the mineral composition of samples. Yet, if the agitation is applied during the acceleration period, the heat flow rate is significantly lowered and the morphology and mineral composition of samples undergo irreversible change, freshly formed syngenite is destroyed and no longer restored. The penetration force and the static yield stress grow linearly during the induction period and exponentially during the acceleration period. Agitation during the induction period destroys the structure, which causes the static yield stress and the penetration force values becoming nearly equal to zero. However, during the acceleration period, even after agitation the static yield stress and the penetration force exhibit high residual values, which indicates the impact of hydration to the structural build-up.

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早期水化过程中的搅拌对水泥浆触变性和形态的影响
通过应用渗透试验、小振幅振荡剪切扫描试验(SAOS)、等温线量热试验、扫描电子显微镜(SEM)和能量色散 X 射线分析(EDX),研究了早期水化过程中的搅拌对添加和不添加超塑化剂(SP)的水泥浆的触变性和形态的影响。结果表明,在诱导期间搅拌水泥浆会增加热流速率,破坏样品的现有结构,但不会改变样品的矿物成分。然而,如果在加速期进行搅拌,热流速率会明显降低,样品的形态和矿物成分会发生不可逆的变化,新形成的正长岩被破坏,不再恢复。穿透力和静屈服应力在诱导期呈线性增长,在加速期呈指数增长。诱导期的搅拌破坏了结构,导致静屈服应力和渗透力值几乎等于零。然而,在加速期间,即使经过搅拌,静屈服应力和穿透力也会显示出较高的残余值,这表明水合作用对结构形成的影响。
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来源期刊
Materials and Structures
Materials and Structures 工程技术-材料科学:综合
CiteScore
6.40
自引率
7.90%
发文量
222
审稿时长
5.9 months
期刊介绍: Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.
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