Tulio Honorio, Syrine Razki, Alexandra Bourdot, Farid Benboudjema
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引用次数: 0
Abstract
Thermal and themo-mechanical properties of alkali-silica reaction (ASR) products are poorly studied. The existent property data refers to theoretical considerations and do not account for the fact that ASR products can be crystalline, nanocrystalline and potentially amorphous. Here, the thermal conductivity, heat capacity, and coefficient of thermal expansion of crystalline structures (based on Na- and K-shlykovite), nanocrystalline structure (based on defective K-shlykovite structures), and amorphous ASR product are calculated using molecular simulations. Semi-classical estimates of the thermal conductivity, heat capacity, and standard molar entropy are provided. The anisotropy of thermal conductivity and thermal expansion is quantified. Nanoacoustics parameters (sound velocities, phonon free path and relaxation time) are calculated. These results contribute to completing property data for ASR products.
对碱硅反应（ASR）产物的热性能和力学性能的研究很少。现有的属性数据都是理论上的考虑，并没有考虑到碱硅反应产物可以是晶体、纳米晶体和潜在的非晶体这一事实。在此，利用分子模拟计算了晶体结构（基于 Na- 和 K-shlykovite）、纳米晶体结构（基于有缺陷的 K-shlykovite 结构）和无定形 ASR 产物的热导率、热容量和热膨胀系数。提供了热导率、热容量和标准摩尔熵的半经典估计值。对热导率和热膨胀的各向异性进行了量化。计算了纳米声学参数（声速、声子自由路径和弛豫时间）。这些结果有助于完善 ASR 产品的属性数据。
期刊介绍：
Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.
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