为了增强水泥砂浆材料的强度和变形性能,同时提高矿产资源利用率,将矿渣纤维掺入水泥砂浆进行改性。通过开展无侧限压缩试验,研究了矿渣纤维的掺量和长度效应对水泥砂浆强度与变形特性的影响规律。结果表明:随着矿渣纤维掺量的增加,水泥砂浆的无侧限抗压强度呈增长趋势,但增长幅度在掺量超过0.3%后明显降低;采用5 mm和10 mm两种长度的矿渣纤维进行水泥砂浆改性,在相同掺量条件下,长纤维对水泥砂浆强度的提升幅度约为短纤维的1.3~1.5倍;经过微观形态观察,一定掺量的矿渣纤维与水泥砂浆混合后,骨料颗粒间的黏结程度增强,形成了纤维的桥接效应,进而提高了水泥砂浆的强度和延性指标。
Abstract
Cement mortar was reinforced by mixing with blast furnace slag fiber to enhance the mechanical properties of cement mortar materials and improve the utilization rate of mineral resources. The effects of the content and length of furnace slag fibers on the strength characteristics of reinforced mortar specimens were studied via unconfined compression tests. The results manifest that with the increase of slag fiber content, the unconfined strength of cemental mortar improves; but such improvement attenuates notably when the slag fiber content exceeds 0.3%. Furthermore, slag fibers with lengths of 5 mm and 10 mm were mixed for comparison. Given the same fiber content, long fiber generates a strengthening effect 1.3-1.5 times that of short fiber. Microscopic morphology observation demonstrates that the addition of furnace slag fibers to cement mortar can improve the adhesion between particles, forming a “bridging effect”, thus finally enhancing the strength and toughness of cement mortar.
关键词
矿渣纤维 /
水泥砂浆 /
无侧限压缩试验 /
强度 /
微观形态
Key words
slag fiber /
cement mortar /
unconfined compression test /
strength /
microstructure
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基金
国网河北省电力有限公司科技项目(kj2017-026)
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