聚乙烯纤维对煤渣粉混凝土力学性能的影响
Effect of Polyethylene Fiber on Mechanical Properties of Coal Slag Powder Concrete
以煤渣粉(CSP)取代部分水泥制备混凝土,研究聚乙烯纤维(PEF)对混凝土力学性能的影响。随着CSP取代水泥量和PEF掺量的增加,混凝土坍落度不断降低。当CSP取代水泥量为25%且PEF配合比不超过1.2 kg/m3时,混凝土坍落度降低不显著。随着CSP取代水泥量的增加,混凝土孔隙率呈先降后升的趋势。当CSP取代水泥量为25%时加入PEF,随着PEF掺量的增加,混凝土孔隙率先降后升。随着CSP取代水泥量或PEF掺量的增加,混凝土抗压强度和抗折强度先增大后减小。这表明PEF提高了混凝土的塑性,有效抑制了混凝土在荷载下的裂纹发展和应力集中,尤其是对抗折性能改善效果显著。当CSP取代水泥量不超过20%且不加入PEF时,混凝土力学性能也能满足设计要求。而CSP取代水泥量增至25%时,需要加入适量的PEF方可使力学性能达标。当CSP取代水泥量为25%、PEF配合比为1.2 kg/m3时,可制备出性能优异的CSP混凝土,孔隙率降低11.4%,抗压强度和抗折强度分别比空白样品(PC)提高12.0%和42.2%,而坍落度仅降低13 mm。
Coal slag powder (CSP) was used to replace a portion of cement in concrete preparation, and the effect of polyethylene fiber (PEF) on the mechanical properties of concrete was investigated. As the replacement amount of CSP and the dosage of PEF increased, the slump of concrete decreased continuously. When the CSP replacement amount was 25% and the PEF mix proportion did not exceed 1.2 kg/m3, the reduction in concrete slump was not significant. With the increase of CSP replacement amount, the porosity of concrete first decreased and then increased. At a CSP replacement amount of 25%, the addition of PEF caused the concrete porosity to first decrease and then increase with the increasing PEF dosage. As the CSP replacement amount or PEF dosage increased, both the compressive strength and flexural strength of concrete first increased and then decreased. This indicated that PEF enhanced the ductility of concrete and effectively inhibited crack development and stress concentration under loading, with a particularly notable improvement in flexural property. When the CSP replacement amount did not exceed 20% and no PEF was added, the mechanical properties of concrete could still meet the design requirements. However, when the CSP replacement amount was increased to 25%, an appropriate amount of PEF was required to achieve the required mechanical property. At a CSP replacement amount of 25% and a PEF mix proportion of 1.2 kg/m3, CSP concrete with excellent property was prepared, showing an 11.4% reduction in porosity, an increase of 12.0% in compressive strength and an increase of 42.2% in flexural strength, respectively, compared with the blank sample (PC), while the slump decreased by only 13 mm.
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陕西省教育厅服务地方计划项目(23JC019)
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