纤维长度对高性能砂浆力学性能的影响研究
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摘要
为研究纤维长度(长径比)对高性能砂浆力学性能的影响,在保持纤维总掺量(质量掺量5%)不变的情况下采用不同长度的短切耐碱玻纤分别对高性能砂浆进行增强,并对增强后的砂浆基体分别进行抗压、抗折和劈拉性能对比试验。结果表明,砂浆基体采用短切纤维增强后的延性明显提高,受压、劈拉破坏时试件呈现裂而不碎的破坏形态,其抗压、抗折和劈拉强度比未掺纤维时总体提高40%左右;纤维长度对砂浆力学性能的增强效果影响明显,砂浆的抗压、抗折和劈拉强度提高幅度随纤维长度的增加而增加,掺入12 mm耐碱玻纤砂浆基体的抗压、抗折及劈拉强度提高幅度比掺入6 mm耐碱玻纤时分别提高约18%、5%和19%;不同长度的纤维混杂后对砂浆力学性能的改善呈一定的正相关性。
To study the fiber length(i.e. the ratio of length to diameter) on the mechanical behavior of high performance mortar, the high performance mortar was reinforced with different lengths of short-cut alkali glass fiber under the condition for keeping the constant total content(5% of the mass content) of fibers, and the testes of compression, flexure and splitting properties for the reinforced mortar were carried out. The results showed that the ductility of the mortar reinforced with fibers was improved obviously comparing with that of the unreinforced mortar, and the ductile failure pattern without breaking for the mortar specimens reinforced with fibers was observed during testing. The compression strength, flexure strength and splitting strength of the reinforced mortar specimens were increased by 40% comparing with that of unreinforced mortar specimens. The fiber length had a significant influence on the reinforcing efficiency of the mechanical properties of mortar, the strengths of compression, flexure and splitting of the reinforced mortar specimens were increased with the increase of the fiber length, these strengths for the mortar reinforced with 12 mm fibers were higher by 18%, 5% and 19%respectively than that reinforced with 6 mm fibers. The positively correlation of improvement effect of the mechanical properties for the mortar reinforced with the hybrid fibers of different lengths was obtained.
To study the fiber length(i.e. the ratio of length to diameter) on the mechanical behavior of high performance mortar, the high performance mortar was reinforced with different lengths of short-cut alkali glass fiber under the condition for keeping the constant total content(5% of the mass content) of fibers, and the testes of compression, flexure and splitting properties for the reinforced mortar were carried out. The results showed that the ductility of the mortar reinforced with fibers was improved obviously comparing with that of the unreinforced mortar, and the ductile failure pattern without breaking for the mortar specimens reinforced with fibers was observed during testing. The compression strength, flexure strength and splitting strength of the reinforced mortar specimens were increased by 40% comparing with that of unreinforced mortar specimens. The fiber length had a significant influence on the reinforcing efficiency of the mechanical properties of mortar, the strengths of compression, flexure and splitting of the reinforced mortar specimens were increased with the increase of the fiber length, these strengths for the mortar reinforced with 12 mm fibers were higher by 18%, 5% and 19%respectively than that reinforced with 6 mm fibers. The positively correlation of improvement effect of the mechanical properties for the mortar reinforced with the hybrid fibers of different lengths was obtained.
引文
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[2]赵晶,鲁红筠.耐碱玻璃纤维在混凝土中的增强效应[J].低温建筑技术,2011(9):1-2.
[3] Mirza F A, Soroushian P. Effects of alkali-resistant glass fiber reinforcement on crack and temperature rsistance of lightweight concrete[J]. Cement&Concrete Composites,2002, 24(2):223-227.
[4] Kim G B, Waldron P, Pilakoutas K. International GRCA Congress[D]. UK:University of Sheffield,2003:209-216.
[5] Jess F, Ortlepp R, Curbach M. International GRCA Congress[D]. UK:University of Sheffield, 2003:250-236.
[6] Takeuchi Y, Nishibori S. International GRCA Congress[D]. UK:University of Sheffield, 2003:156-188.
[7]傅翔,谢洪阳,王诗翔.玻璃纤维增强不拆卸模板性能试验研究[J].南昌航空大学学报(自然科学版),2016(3):66-71.
[8]高妮,喻刚强,赵亚丽.玻璃纤维与聚合物复掺改性水泥砂浆的研究[J].混凝土与水泥制品,2016(3):53-57.
[9]李国忠,宁超,原海燕.改性聚丙烯纤维对水泥砂浆力学性能的影响[J].建筑材料学报.2010(2):135-138.
[10]黄兆龙,湛渊源.粉煤灰混凝土掺配比技术[J].粉煤灰综合利用,2002, 15(5):3-5.
[11]李晓民,赵晶,宋学富,等.耐碱玻璃纤维在道路混凝土中的应用研究[J].新型建筑材料,2004, 11(1):8-11.
[12]赵晶,鲁红筠.耐碱玻璃纤维在混凝土中的增强效应[J].低温建筑技术,2011(9):1-2.
[13]吴耀青.多尺度纤维复合增强水泥基材料力学性能研究[D].南京:河海大学,2017.
[14]陕西省建筑科学研究院.建筑砂浆基本性能试验方法标准:JGJ/T 70-2009[S].北京:中国建筑工业出版社,2009.