改良超塑混凝土预制板

G. Ferrari, V. Riunno, D. Salvioni, P. Tassone
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引用次数: 0

摘要

混凝土瓦是根据一种新技术生产的,该技术基于真空处理结合振冲压实放置超塑化混合物。采用不同的水灰比(0.50或0.32),在没有或存在真空处理的情况下,制造了三种混凝土混合物(根据这种技术都是振冲压实的)。对混凝土瓦片中的无水水泥进行了抗折强度、尺寸稳定性、扫描电镜、图像分析和粒度分布等测试。在振冲压实放置过程中,真空处理除去新鲜混合物中的空气空隙,增加了弯曲强度,但没有改变尺寸稳定性。W/C从0.50降低到0.32显著提高了抗弯强度。它还提高了尺寸稳定性,因为混凝土瓷砖的两个相对面的不同湿度暴露造成的卷曲效果较低。真空处理与低W/C相结合,产生了无宏观缺陷、低微孔隙率的水泥基体,这是这些混凝土瓦高强度、低卷边效果的原因。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Improved Superplasticized Precast Concrete Tiles
Concrete tiles were produced according to a new technology based on a vacuum treatment combined with a vibro-compacting placement of superplasticized mixture. Three concrete mixtures (all vibro-compacted according to this technique) were manufactured with different water-cement ratio (0.50 or 0.32) and in the absence or in the presence of the vacuum treatment. Measurements of flexural strength, dimensional stability, SEM, image analysis and particle size distribution of anhydrous cement in concrete tiles were carried out. The vacuum treatment, which removed entrapped air voids from the fresh mixture during the vibro-compacting placement, increased flexural strength but did not change the dimensional stability. The reduction in the W/C from 0.50 to 0.32 significantly increased flexural strength. It is also improved the dimensional stability in terms of a lower curling effect caused by different humidity exposures of the two opposite faces of the concrete tile. The combination of vacuum treatment with low W/C produces a macro-defect free and low micro-porosity cement matrix which is responsible for the high strength and low curling effect of these concrete tiles.
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