Drying shrinkage and carbonation of steel slag-metakaolin alkali-activated composites: Effect of vegetable oil addition and slag aggregates

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

Cement and Concrete Research Pub Date : 2024-12-06 DOI:10.1016/j.cemconres.2024.107764

O. Rudić, C. Grengg, Y. Seyrek, F. Steindl, B. Müller, I. Zögl, D. Wohlmuth, N. Ukrainczyk, F. Mittermayr

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引用次数: 0

Abstract

The influence of vegetable oil and steel slag aggregates on the drying shrinkage and carbonation performance of steel slag-based alkali activated materials was investigated. Decrease in carbonation rates by up to 19% attributed to the formation of metal soap phases which strongly reduced the gel and small capillary porosity as well as the specific surface area of the materials. When combined with steel slag aggregates, an additional reduction in carbonation rate of up to 50% could be achieved. Furthermore, the strain induced by shrinkage and rewetting was highly influenced by the type of aggregate used, with a reduction of 40 to 50% observed due to presence of soap phases resulting from the hydrolysis of oil in the metal-alkaline conditions. The observed improvement in durability properties may enable new application possibilities for alkali activated materials, overcoming well-known technical limitations such as high drying shrinkage and high carbonation rates.

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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.