房建材料及制品_2023_《混凝土与水泥制品》杂志社

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发布时间：2020-01-06 00:00:00

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房建材料及制品

表观密度与孔结构对微孔混凝土性能的影响

曹万智，高潇，代佳，王洪镇，杨永恒

2023年第2期

摘要

引用本文

摘要：采用料浆容重法进行配合比设计，分别制备了表观密度为600、800、1 000、1 200 kg/m3的微孔混凝土，并研究了表观密度与孔结构对微孔混凝土性能的影响。结果表明，所制备的微孔混凝土抗压强度在1.68~10.57 MPa之间，导热系数在0.081~0.140 W/（m·K）之间，吸水率在29.76%~48.16 %之间，且微孔混凝土的表观密度对上述性能的影响具有明显的规律性。孔结构测试结果表明，孔隙率、孔分布均匀性、平均孔径大小等因素对微孔混凝土性能也有一定的规律性影响。 Abstract: The slurry bulk density method was used to design the mix proportion, and the microporous concrete with apparent density of 600, 800, 1 000 and 1 200 kg/m3 was prepared, and the influence of apparent density and pore structure on the properties of microporous concrete was studied. The results show that the prepared microporous concrete compressive strength is 1.68~10.57 MPa, thermal conductivity is 0.081~0.140 W/(m·K), and the water absorption rate is between 29.76% and 48.16%. The influence of the apparent density of microporous concrete on the above properties has obvious regularity. The pore structure tests show that the influence of porosity, pore distribution uniformity, average pore size and other factors on the performance of microporous concrete also has a certain regularity.

曹万智,高潇,代佳,等.表观密度与孔结构对微孔混凝土性能的影响[J].混凝土与水泥制品,2023(2):60-64,72. CAO W Z,GAO X,DAI J,et al.Influence of Apparent Density and Pore Structure on Properties of Microporous Concrete[J].China Concrete and Cement Products,2023(2):60-64,72.

蒸压加气混凝土制造过程碳减排量评估模型研究与应用

王铁柱，张佳阳，赵炜璇，杨飞华

2023年第2期

摘要

引用本文

摘要：通过建立蒸压加气混凝土生产碳减排技术评估模型，提出了固废回收利用、绿色能源、余热利用等减碳技术措施。结果表明：采用减碳措施可有效降低蒸压加气混凝土生产阶段的碳排放，为实现蒸压加气混凝土“双碳”目标选择合理技术方向提供依据。 Abstract: Through the establishment of carbon emission reduction technology evaluation model for autoclaved aerated concrete production, carbon reduction technical measures such as solid waste recycling, green energy and waste heat utilization are put forward. The results show that carbon reduction measures can effectively reduce the carbon emissions in the production stage of autoclaved aerated concrete, and provide a basis for selecting a reasonable technical direction to achieve the "double carbon" goal of autoclaved aerated concrete.

王铁柱,张佳阳,赵炜璇,等.蒸压加气混凝土制造过程碳减排量评估模型研究与应用[J].混凝土与水泥制品,2023(2):65-67,72. WANG T Z,ZHANG J Y,ZHAO W X,et al.Research and Application of CO2 Emission Reduction Evaluation Model in Autoclaved Aerated Concrete Manufacturing Process[J].China Concrete and Cement Products,2023(2):65-67,72.

基于近场动力学方法的泡沫混凝土单轴拉伸三维数值模拟

饶烽瑞

2023年第2期

摘要

引用本文

摘要：采用近场动力学方法模拟了泡沫混凝土三维模型的单轴拉伸，通过与文献数据对比验证了数值模拟的有效性。基于对孔隙率为30%~70%、单元孔隙球度为0.6~1.0的泡沫混凝土三维模型的模拟结果，探讨了泡沫混凝土的孔隙结构对抗拉性能的影响。结果表明：泡沫混凝土的抗拉性能（弹性模量、强度和断裂能）随着孔隙率的增加而降低，随着单元孔隙球度的增加而提升。泡沫混凝土三维模型的抗拉性能具有显著的非均质性，这是由于孔隙随机分布导致不同模型的水泥骨架壁厚级配不同所致，在壁厚较薄的局部区域容易造成应力集中，从而削弱泡沫混凝土的抗拉性能。 Abstract: The peridynamics was used to simulate the uniaxial tension of the three-dimensional foamed concrete model, and the validity of the numerical simulation was verified by comparing with experimental datas. Based on the simulation results of the three-dimensional foamed concrete model with porosity of 30%~70% and single pore sphericity of 0.6~1.0, the influence of the pore structure of foamed concrete on its tensile properties was discussed. The results show that the tensile properties(elastic modulus, strength and fracture energy) decrease with the increase of porosity, and increase with the increase of single pore sphericity. The tensile properties of the three-dimensional foamed concrete model have significant heterogeneity, which is due to the random distribution of pores leading to different cement skeleton wall thickness gradations of different models. It is easy to cause stress concentration in local areas with thinner wall thickness, thus weakening the tensile properties of foamed concrete.

饶烽瑞.基于近场动力学方法的泡沫混凝土单轴拉伸三维数值模拟[J].混凝土与水泥制品,2023(2):68-72. RAO F R.Three-dimensional Numerical Simulation of Foamed Concrete Under Uniaxial Tension Based on Peridynamics[J].China Concrete and Cement Products,2023(2):68-72.

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