Role of the structure of synthetic Al(OH)3 on the properties of sulfoaluminate cement-based materials

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2023-09-14 DOI:10.1016/j.cemconres.2023.107330

Haiyan Li , Yang Liu , Jiang Lu , Wei Zhao , Muhammad Moeen , Xuemao Guan , Jianping Zhu

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Abstract

A promising approach to accelerate cement hydration has been discovered, wherein superfine particles are utilized to introduce additional nucleation sites for the growth of hydration products. This study investigated the effects of synthetic amorphous aluminum hydroxide (AH₃), bayerite, and boehmite on SCGM properties.

The results show that amorphous AH₃ acted as nucleation sites for the growth of bayerite and ettringite (AFt), bayerite provided nucleation sites for the growth of monosulfate (AFm) and AFt, and boehmite could offer nucleation sites for the growth of AFt. Additionally, synthetic AH₃ at pH 12.5 releases AlO₂⁻, and the amount of AlO₂⁻ released and the additional generated AFt were the largest for amorphous AH₃, followed by bayerite and boehmite. Owing to the synergistic effect of the crystal nuclei and AlO₂⁻ released from AH₃, synthetic AH₃ can promote cement hydration, alter the pore structure of the hardened paste, and improve compressive strength at all ages.

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合成Al(OH)3的结构对硫铝酸盐水泥基材料性能的影响

已经发现了一种有希望的加速水泥水化的方法，其中利用超细颗粒来引入水化产物生长的额外成核位点。研究了合成的无定形氢氧化铝(AH3)、巴拜尔石和薄水铝石对SCGM性能的影响。结果表明:无定形AH3为巴拜尔石和钙矾石(AFt)的生长提供了成核位点，巴拜尔石为单硫酸盐(AFm)和单硫酸盐(AFt)的生长提供了成核位点，而勃水铝石为单硫酸盐(AFt)的生长提供了成核位点。此外，在pH 12.5下合成的AH3释放了AlO2−，无定形AH3释放的AlO2−和生成的额外AFt量最大，其次是巴拜尔石和勃水铝石。由于AH3的晶核与释放的AlO2−的协同作用，合成的AH3能够促进水泥水化，改变硬化膏体的孔隙结构，提高各龄期的抗压强度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.