Enhanced early hydration and mechanical properties of cement-based materials with exfoliated layered double hydroxide

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2025-06-06 DOI:10.1016/j.materresbull.2025.113608

Amr Meawad , Omar Soliman , Ippei Maruyama , Saber Ibrahim

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Abstract

This study investigates the preparation and performance of ExLDH, synthesized from Ca-Al layered double hydroxide (Ca-Al LDH) and polymethylmethacrylate (PMMA), as a cement additive to accelerate early hydration and enhance early strength in cement-based materials. The synthesized Ca-Al/PMMA LDH was characterized using X-ray diffraction (XRD), ATR-FTIR, SEM, TEM, BET surface area analysis, and dynamic light scattering (DLS). The composite incorporated into Portland cement at 1, 2, and 3 wt. % concentrations. Isothermal calorimetry assessed hydration heat over 72 h, while microstructural evaluation employed QXRD, ATR-FTIR, TGA-DTA, SEM, and water vapor sorption tests. Mechanical properties were evaluated through compressive and flexural strength tests.

Results confirmed the successful fabrication of ExLDH micro/nano-composites, which serve a dual role in the cement matrix: acting as nucleation sites for hydrated phases and as void fillers to improve structural compaction. This dual effect accelerates hydration, increases hydrated phase content, and significantly enhances compressive strength and structural density.

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剥离层状双氢氧化物增强水泥基材料的早期水化和力学性能

本研究研究了由钙铝层状双氢氧化物（Ca-Al LDH）和聚甲基丙烯酸甲酯（PMMA）合成的ExLDH的制备和性能，ExLDH是一种加速水泥基材料早期水化和提高早期强度的水泥添加剂。采用x射线衍射（XRD）、ATR-FTIR、SEM、TEM、BET表面积分析和动态光散射（DLS）对合成的Ca-Al/PMMA LDH进行了表征。该复合材料以1、2和3 wt %的浓度掺入波特兰水泥中。等温量热法评估72 h的水化热，而微观结构评估采用QXRD， ATR-FTIR, TGA-DTA， SEM和水蒸气吸附测试。通过抗压和抗折强度测试来评估机械性能。结果证实了ExLDH微/纳米复合材料的成功制备，该复合材料在水泥基体中具有双重作用：作为水合相的成核位点，作为空隙填充剂来改善结构压实。这种双重作用加速了水化，增加了水化相含量，显著提高了抗压强度和结构密度。

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

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.