Abstract
Fine coal gangue aggregate (CGA) has a high water absorption, which increases the cracking risk of mortar caused by dry shrinkage. The effects of polypropylene (PP) fiber on the fluidity, strength, dry shrinkage, and cracking of CGA mortar were studied in this paper. The results show that PP fiber reduces the fluidity of CGA mortar, but PP fiber improves compressive and flexural strengths, especially at the early stages. PP fiber also effectively decreases dry shrinkage and the risk of cracking. Overall, PP fiber can effectively improve the properties of CGA mortar.
Highlights
Coal gangue is a kind of solid waste discharged during coal mining
PP fiber decreases the fluidity of coal gangue aggregate (CGA) mortar, and a higher amount of PP fiber will enhance the effect
When the amount of PP fiber increases from 0.6 kg/m3 to 1.5 kg/m3, the fluidity decreases by 15%. ese results are similar to other studies [11, 12]
Summary
Coal gangue is a kind of solid waste discharged during coal mining. Explosion caused by spontaneous combustion during the stacking of coal gangue often happens. It often decreases the workability and strength of concrete [4], and high replacement will aggravate the effects [5]. E high water absorption of CGA seriously affects dry shrinkage, and the cracking frequently happens, especially for plastering mortar. E effect of PP fiber on the drying shrinkage of fine CGA mortar or concrete is rarely paid attention. Erefore, in this paper, PP fiber was Advances in Materials Science and Engineering introduced to a mortar in which fine CGA was used to replace all river sand. E effects of PP fiber on dry shrinkage and the cracking were studied here.
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