Influences of Length and Content of Slag Fiber on Strength Characteristics of Cement Mortar

CHAI Lin-jie; GAO Fan; WANG Yan

doi:10.11988/ckyyb.20211267

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Journal of Changjiang River Scientific Research Institute ›› 2023, Vol. 40 ›› Issue (5) : 178-182. DOI: 10.11988/ckyyb.20211267

Hydraulic Structure and Material

Influences of Length and Content of Slag Fiber on Strength Characteristics of Cement Mortar

CHAI Lin-jie¹, GAO Fan¹, WANG Yan²

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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.

Key words

slag fiber / cement mortar / unconfined compression test / strength / microstructure

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CHAI Lin-jie, GAO Fan, WANG Yan. Influences of Length and Content of Slag Fiber on Strength Characteristics of Cement Mortar[J]. Journal of Changjiang River Scientific Research Institute. 2023, 40(5): 178-182 https://doi.org/10.11988/ckyyb.20211267

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