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首页> 外文期刊>Journal of materials in civil engineering >Effects of Hydrophobic Expanded Silicate Aggregates on Properties of Structural Lightweight Aggregate Concrete
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Effects of Hydrophobic Expanded Silicate Aggregates on Properties of Structural Lightweight Aggregate Concrete

机译：憎水膨胀硅酸盐骨料对结构轻骨料混凝土性能的影响

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摘要

This article addresses the performance of structural lightweight aggregate concretes and the relation of their performance to density class. Natural expanded silicate materials treated with a hydrophobic agent were used and their effects were systematically investigated. Three lightweight concretes with densities of about 1,000, 1,150, and 1,400 kg/m~3 (classes D1.0, D1.2, and D1.4) were designed by applying an optimized particle packing theory. The microstructure, mechanical properties, and durability of the developed concretes were determined and the relations of these properties with density were evaluated. The lightweight concretes showed excellent structural efficiency, with 28-day compressive strengths of about 23, 28, and 42 MPa, respectively. Microstructural analyses showed that the developed concretes had a rather compact microstructure, contributing to enhanced strength. Existing codes for calculating concrete E-modulus were compared, and the best predicting formula is proposed. Mix D1 .4 showed relatively low drying shrinkage, which can be attributed to relatively low initial water use and the internal curing effect brought about by the applied lightweight aggregate. The developed mixes showed excellent durability, as indicated by very low water penetration after 72 h of exposure under a pressure of 0.5 MPa (5 bars) and very small mass loss after 56 cycles of a freeze-thaw test under both deionized water and NaCl conditions.
机译：本文讨论结构轻质骨料混凝土的性能及其性能与密度等级的关系。使用经过疏水剂处理的天然膨胀硅酸盐材料，并对其作用进行了系统的研究。通过应用优化的颗粒堆积理论，设计了三种密度分别为1,000、1,150和1,400 kg / m〜3的轻质混凝土（D1.0，D1.2和D1.4类）。确定了所开发混凝土的微观结构，力学性能和耐久性，并评估了这些性能与密度的关系。轻质混凝土表现出出色的结构效率，其28天抗压强度分别约为23、28和42 MPa。微观结构分析表明，开发的混凝土具有相当紧凑的微观结构，有助于提高强度。比较了现有的计算混凝土E模量的代码，并提出了最佳的预测公式。混合物D1.4显示出较低的干燥收缩率，这可以归因于较低的初始用水量和所施加的轻质骨料带来的内部固化效果。所开发的混合物显示出优异的耐久性，这表现为在0.5 MPa（5 bar）的压力下暴露72小时后极低的水渗透性以及在去离子水和NaCl条件下进行56次冻融试验后的质量损失极小。

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