低碳氧化镁/氢菱镁矿粘结剂——水分状态对力学性能演变的影响

IF 13.1 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2025-06-16 DOI:10.1016/j.cemconres.2025.107966

Ye Zhu , Alexander German , Mateusz Wyrzykowski , Nikolajs Toropovs , Frank Winnefeld , Pietro Lura , Michele Griffa

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引用次数: 0

摘要

我们研究了MgO/氢菱镁砂浆在潮湿（98% RH）和干燥（57% RH）环境下在20°C下固化的力学性能。利用单模共振超声光谱（SIMORUS）测量了准静态加载和动态加载下的线性存储杨氏模量。我们测量了相应的损耗模量和存储模量的非线性对应。潮湿环境对弹性性能的演化产生不利影响，即导致线性存储杨氏模量的降低和非线性杨氏模量的增加，后者是微观结构非均质性和潜在损伤的代表。另一方面，在57% RH条件下，砂浆的线性储存杨氏模量单调增长，损耗模量下降。抗压强度也观察到类似的趋势。我们假设吸水后力学性能的降低是由于吸附的水对微观结构的内在影响。

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Low-carbon MgO/hydromagnesite binders – effect of moisture state on the evolution of mechanical properties

We studied the mechanical properties of MgO/hydromagnesite mortars cured at 20 °C both in humid (98 %RH) and dry (57 %RH) environments. The linear storage Young's modulus was determined with quasi-static loading and dynamically by SIngle MOde Resonance Ultrasound Spectroscopy (SIMORUS) measurements. We measured the corresponding loss modulus and the nonlinear counterpart of the storage modulus. Humid environment adversely affected the evolution of the elastic properties, i.e. it caused a reduction of the linear storage Young's modulus and an increase of its nonlinear counterpart, the latter being a proxy of microstructural heterogeneity and potential damage. On the other hand, mortars cured at 57 %RH experienced a monotonous growth of the linear storage Young's modulus and decrease of the loss modulus. Similar trends were observed for compressive strength. We postulate that the lowering of mechanical properties upon moisture uptake is due to the intrinsic effect of adsorbed water on the microstructure.

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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.