应力梯度作用下轻骨料混凝土受压破坏

IF 0.7 Q4 CONSTRUCTION & BUILDING TECHNOLOGY Nordic Concrete Research Pub Date : 2019-06-01 DOI:10.2478/ncr-2019-0011
J. Živković, J. Øverli
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引用次数: 2

摘要

摘要本实验的目的是研究轻骨料混凝土(LWAC)在压缩和应力梯度下的行为。实验程序包含三套LWAC,用于生产21个棱镜。使用了来自北卡罗莱纳的轻质集料泥质板岩,称为Stalite。在使用干骨料(0.10%含水率)和饱和骨料(7.9%含水率)方面存在差异。第三组包括少量聚乙烯醇纤维(PVA)。棱镜的几何尺寸为100 × 140 × 480 mm(宽×长×高)。柱状样品在压缩中以中心和偏心方式加载。从已获得的实验结果可以看出,应力最大的纤维的侧向变形被应力较小的纤维抵消,从而限制压应力并增加应变。得到的应变水平比预期的要高得多,特别是对于含有PVA纤维的第三组混凝土样品。棱镜试验记录菌株在3.08‰~ 6.82‰范围内。总的来说,石晶石LWAC表现出延性,其次是非常高的应变。第三组样品包括少量聚乙烯醇纤维(体积分数的0.5%),其延展性和不脆性更强。
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Failure of Lightweight Aggregate Concrete in Compression under Stress Gradients
Abstract The objective of this experiment is to investigate the behaviour of lightweight aggregate concrete (LWAC) under compression and with stress gradients. Experimental program contained three sets of LWAC which were used for production of 21 prisms. Lightweight aggregate argillite slate, called Stalite, from North Carolina had been used. The sets differed in using dry (0.10% moisture content) or saturated (7.9% moisture content) aggregate. The third set included a small amount of polyvinyl alcohol fibres (PVA). The geometry of the prisms were 100 × 140 × 480 mm (width × length × height). Prismatic samples were loaded centrically and eccentrically in compression. From the achieved experimental results, it is visible that the lateral deformation of the most stressed fibre is counteracted by the less stressed fibres that confine compressive stress and increase strains. The obtained strain level was much higher than expected, especially for the third set of concrete samples with PVA fibres. Recorded strains in prisms test was in range from 3.08‰ to 6.82‰). In general, LWAC with Stalite showed ductile behaviour followed with very high strains. The third set of samples included a small amount of polyvinyl alcohol fibres (0.5% of volume fractions) was even more ductile and non-brittle.
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来源期刊
Nordic Concrete Research
Nordic Concrete Research CONSTRUCTION & BUILDING TECHNOLOGY-
自引率
20.00%
发文量
8
期刊最新文献
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