Effects of nano- and micro-cellulose on Ca(OH)2 formation: Implications for lime-based binders

IF 13.1 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Cement and Concrete Research Pub Date : 2025-02-27 DOI:10.1016/j.cemconres.2025.107851

Paulina Guzmán García Lascurain , Carlos Rodriguez-Navarro , Lucia Toniolo , Sara Goidanich

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Abstract

Air lime-based mortars and plasters are preferred for the restoration of historic masonry due to their high compatibility, and for modern constructions given their lower environmental impact. However, their slow setting (via carbonation) and their limited strength hinder their widespread use. This study explores the influence of nano- and micro-cellulose additives dosed during lime slaking on the formation and textural/structural features of calcium hydroxide. The alkaline degradation of the additives, along with their interaction and adsorption/occlusion during heterogeneous and homogeneous precipitation of calcium hydroxide was studied. Both additives foster the non-classical crystallization of portlandite via amorphous phases, resulting in plate-like crystals in the case of nano-cellulose, whereas more reactive micro-cellulose promotes the stabilization of a dense liquid precursor, and upon its dehydration, the stabilization of amorphous calcium hydroxide. Ultimately both additives lead to the formation of potentially more reactive nano and mesostructured Ca(OH)₂ particles.

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纳米和微纤维素对Ca(OH)2形成的影响：对石灰基粘合剂的影响

空气石灰基砂浆和灰泥是修复历史建筑的首选，因为它们具有高相容性，对于现代建筑来说，它们对环境的影响较小。然而，它们的缓慢凝固（通过碳化）和有限的强度阻碍了它们的广泛使用。本研究探讨了石灰熟化过程中添加纳米和微纤维素添加剂对氢氧化钙形成和结构特征的影响。研究了添加剂在非均相和均相氢氧化钙沉淀过程中的碱性降解、相互作用和吸附/闭塞。这两种添加剂都通过无定形相促进波特兰石的非经典结晶，在纳米纤维素的情况下产生板状晶体，而更活跃的微纤维素促进致密液体前驱体的稳定，并在其脱水后稳定无定形氢氧化钙。最终，这两种添加剂都会导致潜在的更具反应性的纳米和介观结构Ca(OH)2颗粒的形成。

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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.