混杂纤维和聚合物乳液对水泥基铺装材料性能影响
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摘要
采用钢纤维、PVA纤维和聚合物乳液对水泥基路面铺装材料进行改性,研究不同混杂纤维掺量和聚合物乳液掺量对水泥基材料的力学性能和抗疲劳性能的影响及其作用机理。研究结果表明:混杂纤维和聚合物乳液对水泥基材料有显著的增韧效果,当纤维掺量为0.5%PVA+1.0%钢纤维时,28d抗折强度可达16.4 MPa,弯曲韧性指数I20可达15.95;加入聚合物乳液后,28d抗折强度提升25%以上,弯曲韧性指数I20可达22.12,并且提升工作性能;混杂纤维和聚合物乳液的加入还会提升水泥基材料抗弯曲疲劳性能,当掺入1.0%钢纤维+0.5%PVA纤维以及10%聚合物乳液时,0.65应力水平下抗弯疲劳循环次数大于350万次,是空白对照的3.76倍。
The effects of hybrid fiber and polymer emulsion on the mechanical properties and fatigue resistance of cement-based paving materials are studied in the paper.The results show that,the hybrid fiber and polymer emulsion have significant toughening effect on cement-based materials.When the fiber content is 0.5% PVA+1.0% steel fiber,the 28 dflexural strength is 16.4 MPa,and bending ductility index I20 is 15.95;after adding the polymer emulsion,the flexural strength of the 28 dis increased by more than 25%,and I20 can be up to 22.12,and the workability is improved;hybrid fiber and the polymer emulsion also improve the bending fatigue resistance of the cement-based material.When 1.0%steel fiber+0.5% PVA fiber and 10% polymer emulsion are blended,bending fatigue cycles at 0.65 stress level is more than 3.5 million times,which is 3.76 times that of the control sample.
The effects of hybrid fiber and polymer emulsion on the mechanical properties and fatigue resistance of cement-based paving materials are studied in the paper.The results show that,the hybrid fiber and polymer emulsion have significant toughening effect on cement-based materials.When the fiber content is 0.5% PVA+1.0% steel fiber,the 28 dflexural strength is 16.4 MPa,and bending ductility index I20 is 15.95;after adding the polymer emulsion,the flexural strength of the 28 dis increased by more than 25%,and I20 can be up to 22.12,and the workability is improved;hybrid fiber and the polymer emulsion also improve the bending fatigue resistance of the cement-based material.When 1.0%steel fiber+0.5% PVA fiber and 10% polymer emulsion are blended,bending fatigue cycles at 0.65 stress level is more than 3.5 million times,which is 3.76 times that of the control sample.
引文
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[4]梁乃兴,李祝龙.聚合物乳液改性水泥混凝土[J].长安大学学报:自然科学版,1998,(S1):19-23.
[5]娄冬,曹京京.高韧性轻质硫铝酸盐水泥基发泡保温材料的制备及性能研究[J].新型建筑材料,2016,43(11):79-82.
[6]张元元.钢—聚丙烯混杂纤维混凝土单轴受压本构关系与受拉性能研究[D].武汉:武汉大学,2010.
[7]Bentur A, Mindess S.Fibre reinforced cementitious composites[M].CRC Press,2014.
[8]申爱琴,李祝龙,王小明.聚合物乳液改性水泥混凝土的微观结构[J].混凝土,2001,(3):19-23.
[9] Ramachandran V S.Concrete admixtures handbook[M].Noyes Publications,1984.