The manufacture of natural hydraulic limes: Influence of raw materials' composition, calcination and slaking in the crystal-chemical properties of binders

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

Cement and Concrete Research Pub Date : 2024-08-06 DOI:10.1016/j.cemconres.2024.107631

C. Parra-Fernández , A. Arizzi , M. Secco , G. Cultrone

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Abstract

This study aims to achieve an in-depth understanding of the manufacturing process of natural hydraulic lime (NHL) by assessing the influence of raw materials' chemical- mineralogical composition and the effect of the slaking process. NHLs with variable hydraulicity were manufactured using 56 raw materials from carbonate outcrops in Andalusia (Spain). This study shows that siliceous limestones with microcrystalline quartz generate hydraulic phases after calcination. However, when the amount of this reactive silica exceeds 18% by weight, CaO is not formed, and only calcium silicates appear. It was also found that slaking of NHL leads to partial hydration of the most reactive calcium silicates, reducing the expected reactivity of the lime. Instead, exposure of NHL quicklimes to environmental relative humidity promotes the formation of disordered portlandite and reduces the partial hydration of hydraulic phases. Our findings demonstrate that standard slaking can be replaced by alternative methods for the studied binders.

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天然液压石灰的制造：原料成分、煅烧和焙烧对粘结剂晶体化学性质的影响

这项研究旨在通过评估原材料的化学矿物成分的影响以及烘干工艺的作用，深入了解天然水硬性石灰（NHL）的制造工艺。我们使用安达卢西亚（西班牙）出露碳酸盐岩的 56 种原材料制造了不同水力性质的天然水硬性石灰。研究表明，含有微晶石英的硅质灰岩在煅烧后会产生水相。然而，当这种活性二氧化硅的重量超过 18% 时，就不会形成氧化钙，而只会出现硅酸钙。研究还发现，焙烧石灰会导致活性最高的硅酸钙部分水化，从而降低石灰的预期活性。相反，将 NHL 生石灰暴露在环境相对湿度中会促进无序波长石的形成，并减少水相的部分水化。我们的研究结果表明，对于所研究的粘结剂，可以用其他方法代替标准的烘干法。

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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.