Effect of power ultrasound-assisted mixing on the hydration and microstructural development of cement paste

IF 4.7 3区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Sustainable Cement-Based Materials Pub Date : 2022-12-08 DOI:10.1080/21650373.2022.2153390

Guangqi Xiong, Chong Wang, Shuai Zhou, Ying Zhao, Yunxuan Li, Yang Liu, Jian Qiu

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引用次数: 3

Abstract

Power ultrasound (PUS) was first used to assist the mixing of cement paste. Five ultrasonic power levels (0 W, 240 W, 480 W, 720 W, and 912 W) were adopted. The compressive strength was tested. The hydration process and products of the cement paste were analyzed by inductively coupled plasma–optical emission spectrometry (ICP–OES), isothermal calorimetry, thermogravimetric analysis (TGA), quantitative X-ray diffraction (QXRD), mercury intrusion porosimetry (MIP), backscattered electron–energy dispersive spectroscopy (BSE–EDS), and environmental scanning electron microscopy (ESEM). The results indicated that the compressive strength was improved by using the PUS-assisted mixing. Moreover, PUS-assisted mixing significantly promoted the formation of calcium hydroxide (CH) and ettringite. The crystallization and densification process of the C-S-H phase was accelerated. The macroscopic voids and large capillary pores were substantially reduced. Therefore, PUS-assisted mixing is a promising technology for improving hydration behaviors and strength of cement paste, which could be used in fabricated production.

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功率超声辅助搅拌对水泥浆体水化及微观结构发展的影响

功率超声（PUS）首先被用于辅助水泥浆的混合。五个超声波功率电平（0 W、 240 W、 480 W、 720 W、和912 W）被采纳。测试了抗压强度。通过电感耦合等离子体发射光谱法（ICP–OES）、等温量热法、热重分析法（TGA）、定量X射线衍射法（QXRD）、压汞孔隙率测定法（MIP）、背散射电子能谱仪（BSE–EDS）分析了水泥浆的水化过程和产物，以及环境扫描电子显微镜（ESEM）。结果表明，PUS辅助混合提高了复合材料的抗压强度。此外，PUS辅助混合显著促进了氢氧化钙（CH）和钙矾石的形成。C-S-H相的结晶和致密化过程加快。宏观孔隙和大的毛细管孔隙显著减少。因此，PUS辅助搅拌是一种很有前途的改善水泥浆体水化性能和强度的技术，可用于装配式生产。

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来源期刊

Journal of Sustainable Cement-Based Materials Multiple-

CiteScore

6.60

自引率

15.90%

发文量

期刊介绍： The Journal of Sustainable Cement-Based Materials aims to publish theoretical and applied researches on materials, products and structures that incorporate cement. The journal is a forum for discussion of research on manufacture, hydration and performance of cement-based materials; novel experimental techniques; the latest analytical and modelling methods; the examination and the diagnosis of real cement and concrete structures; and the potential for improved cement-based materials. The journal welcomes original research papers, major reviews, rapid communications and selected conference papers. The Journal of Sustainable Cement-Based Materials covers a wide range of topics within its subject category, including but are not limited to: • raw materials and manufacture of cement • mixing, rheology and hydration • admixtures • structural characteristics and performance of cement-based materials • characterisation techniques and modeling • use of fibre in cement based-materials • degradation and repair of cement-based materials • novel testing techniques and applications • waste management