Impact of the slaking method on the mineralogy of natural hydraulic limes and its effects on mortar mechanical properties

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

Cement and Concrete Research Pub Date : 2025-05-19 DOI:10.1016/j.cemconres.2025.107941

Clara Parra-Fernández, Anna Arizzi

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Abstract

The influence of slaking on the properties of natural hydraulic limes (NHL) has been little studied so far. Laboratory-manufactured limes have been produced to investigate the mineralogical changes that occur during the slaking process. Two different hydration methods have been compared: conventional slaking, by adding water in a 1:1 water:CaO ratio, and passive slaking, by exposure of the quicklimes to a relative humidity of 60 ± 5 % and 80 ± 5 % RH. The mineralogical evolution of limes was monitored under different slaking conditions using the X-ray diffraction Quantitative Phase Analysis. The resulting NHLs have been used to produce mortars, to assess the influence of the slaking conditions on their mechanical strength. The results show that passive slaking at relative humidities higher than 60 % ensures complete transformation of CaO into Ca(OH)₂, and gives place to natural hydraulic limes with comparable, or even slightly improved properties to those conventionally slaked.

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熟化方法对天然水工石灰矿物学的影响及其对砂浆力学性能的影响

迄今为止，关于熟化对天然水工石灰（NHL）性能影响的研究很少。实验室制造的石灰已经被生产出来，以研究在熟化过程中发生的矿物学变化。比较了两种不同的水化方法：以1:1的水：CaO比例加水的常规熟化方法和将生石灰暴露于相对湿度为60±5%和80±5% RH的被动熟化方法。采用x射线衍射定量物相分析技术，对不同熟化条件下石灰的矿物学演化进行了监测。所得到的NHLs已用于生产砂浆，以评估熟化条件对其机械强度的影响。结果表明，在相对湿度大于60%的条件下，被动熟化可以保证CaO完全转化为Ca(OH)2，取而代之的是天然水力石灰，其性能与常规熟化的石灰相当，甚至略有改善。

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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.