硅灰和粉煤灰取代率对橡胶混凝土强度影响试验研究
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摘要
文中以橡胶混凝土为研究对象,分别考虑10%、20%、30%三种橡胶颗粒体积代替等体积细骨料,同时考虑不同水泥取代率的硅灰和粉煤灰的影响,研究其立方体抗压强度、抗折强度、折压比的变化规律,并揭示破坏机理。研究表明,与普通混凝土相比,橡胶混凝土破坏时表现为明显的延性破坏,随橡胶取代率增加,橡胶混凝土的抗压和抗折强度均有不同程度的下降,其中抗压强度的下降程度更大,而折压比随橡胶掺量逐渐增大,韧性有明显的改善;利用硅灰可以使橡胶混凝土的强度得到一定程度的提高,当硅灰的取代率为10%时,抗折强度和抗压强度分别提高了16%、13%,此后若继续增大硅灰取代率,强度则无明显变化,而粉煤灰对橡胶混凝土的增强效果并不明显。
In this paper, rubberized concrete is taken as the research objects. We substitute three kinds of crumb rubber for fine aggregates at the same volume and their replacement rates are respectively 10%,20%,30%. At the same time, we explore how the silica fume and fly ash which are substituted for the cement at the different replacement rates affect the mechanical properties of rubberized concretes, including the compressive strength, flexural strength and the ratio of the compressive strength to flexural strength and reveal the failure mechanism. The results show that it exhibits a ductile failure obviously compared to the normal concrete when the rubberized concrete yields. With the increase of the crumb rubber replacement rate, both of its compressive strength and flexural strength decrease with varying degrees, and the compressive has a bigger reduction. However, the ratio of the compressive strength to flexural strength increases gradually and the toughness of concretes is remarkably improved.What's more, the strength of rubberized concrete can be improved by the silica fume. When the silica fume replacement rate is 10%, the flexural strength and compressive strength increase by 16% and 13%, respectively. After that,if the silica fume replacement rate continues to increase, the strength does not have the obvious change, and the influence of fly ash on the rubberized concrete is not obvious.
In this paper, rubberized concrete is taken as the research objects. We substitute three kinds of crumb rubber for fine aggregates at the same volume and their replacement rates are respectively 10%,20%,30%. At the same time, we explore how the silica fume and fly ash which are substituted for the cement at the different replacement rates affect the mechanical properties of rubberized concretes, including the compressive strength, flexural strength and the ratio of the compressive strength to flexural strength and reveal the failure mechanism. The results show that it exhibits a ductile failure obviously compared to the normal concrete when the rubberized concrete yields. With the increase of the crumb rubber replacement rate, both of its compressive strength and flexural strength decrease with varying degrees, and the compressive has a bigger reduction. However, the ratio of the compressive strength to flexural strength increases gradually and the toughness of concretes is remarkably improved.What's more, the strength of rubberized concrete can be improved by the silica fume. When the silica fume replacement rate is 10%, the flexural strength and compressive strength increase by 16% and 13%, respectively. After that,if the silica fume replacement rate continues to increase, the strength does not have the obvious change, and the influence of fly ash on the rubberized concrete is not obvious.
引文
[1]王涛,洪锦祥,缪昌文,等.橡胶混凝土的试验研究[J].混凝土,2009(1):67.
[2]焦楚杰,张传镁,张文华.橡胶混凝土研究进展[J].重庆建筑大学学报,2008,4(2):138-145.
[3]H A TOUTANJI,The use of rubber tire particles in concrete to replace mineral aggregates[J].Cement and concrete composites,1998,18:135~139.
[4]TOPCU.The properties of rubberized concretes[J].Cement and concrete research,1995,125(2):304-310.
[5]熊杰,郑磊,袁勇.废橡胶混凝土抗压强度试验研究[J].混凝土,2004(12):40-41.
[6]MALEK K BATAYNEH,IQBAL MARIE,IBRAHIM ASI.Promoting the use of crumb rubber concrete in developing countries[J].Waste management,in press,corrected proof,2007,12.
[7]马一平,刘晓勇,谈至明,等.改性橡胶混凝土的物理力学性能[J].建筑材料学报,2009,8(4):379-383.
[8]王海龙,张克,额日德木.改性橡胶对轻骨料混凝土改性作用分析[J].建筑材料学报,2017,10(5):780-784.
[9]陈爱玖,韩小燕,汪志昊,等.改性橡胶混凝土力学性能试验研究[J].混凝土,2018(5):91-9.
[10]薛刚,武春风,胡小龙.塑钢纤维-橡胶混凝土应力-应变关系试验研究[J].硅酸盐通报,2016,11(11):3796~3802.
[11]夏冰华,刘远才,曾世东.塑钢纤维-橡胶粉陶粒混凝土标准抗压强度的数学分析.混凝土,2012(10):80-83.
[12]TRILOK GUPTA,SANDEEP CHAUDHARY,RAVI K SHARMA.Mechanical and durability properties of waste rubber fiber concrete with and without silica fume[J].Journal of cleaner production,2016.
[13]GUNEYISI,E GESOGLU,MOZTURAN T.Properties of rubberized concretes containing silica fume[J].Cement and concrete research,2014(12):19.
[14]中华人民共和国住房和城乡建设部.普通混凝土配合比设计规程:JGJ 55-2011[S].北京:中国建筑工业出版社,2011.
[15]中华人民共和国建设部,国家质量监督检验检疫总局.普通混凝土力学性能试验方法标准:GB 50081-2002[S].北京:中国建筑工业出版社,2003.
[16]周伏良,赵俊逸,杨果林.橡胶粉掺入量对混凝土基本性能的影响研究[J].混凝土,2018(1):72-75.
[17]李清富,孙振华,张海洋.粉煤灰和硅粉对混凝土强度影响的试验研究[J].混凝土,2011(5):77-79.
[18]柳颖臣,邓海斌,王海龙,等.硅灰橡胶集料混凝土力学性能试验研究[J].金华职业技术学院报,2014,5(3):55-58.
[19]刘数华,方坤河,曾力.粉煤灰在混凝土中的强度效应试验研究[J].粉煤灰综合利用,2003(5):34-35.
[20]刘志勇,李雁,李勇.粉煤灰混凝土与基准混凝土力学性能对比试验[J].徐州工程学院(自然科学版),2011,6(2):9-13.
[2]焦楚杰,张传镁,张文华.橡胶混凝土研究进展[J].重庆建筑大学学报,2008,4(2):138-145.
[3]H A TOUTANJI,The use of rubber tire particles in concrete to replace mineral aggregates[J].Cement and concrete composites,1998,18:135~139.
[4]TOPCU.The properties of rubberized concretes[J].Cement and concrete research,1995,125(2):304-310.
[5]熊杰,郑磊,袁勇.废橡胶混凝土抗压强度试验研究[J].混凝土,2004(12):40-41.
[6]MALEK K BATAYNEH,IQBAL MARIE,IBRAHIM ASI.Promoting the use of crumb rubber concrete in developing countries[J].Waste management,in press,corrected proof,2007,12.
[7]马一平,刘晓勇,谈至明,等.改性橡胶混凝土的物理力学性能[J].建筑材料学报,2009,8(4):379-383.
[8]王海龙,张克,额日德木.改性橡胶对轻骨料混凝土改性作用分析[J].建筑材料学报,2017,10(5):780-784.
[9]陈爱玖,韩小燕,汪志昊,等.改性橡胶混凝土力学性能试验研究[J].混凝土,2018(5):91-9.
[10]薛刚,武春风,胡小龙.塑钢纤维-橡胶混凝土应力-应变关系试验研究[J].硅酸盐通报,2016,11(11):3796~3802.
[11]夏冰华,刘远才,曾世东.塑钢纤维-橡胶粉陶粒混凝土标准抗压强度的数学分析.混凝土,2012(10):80-83.
[12]TRILOK GUPTA,SANDEEP CHAUDHARY,RAVI K SHARMA.Mechanical and durability properties of waste rubber fiber concrete with and without silica fume[J].Journal of cleaner production,2016.
[13]GUNEYISI,E GESOGLU,MOZTURAN T.Properties of rubberized concretes containing silica fume[J].Cement and concrete research,2014(12):19.
[14]中华人民共和国住房和城乡建设部.普通混凝土配合比设计规程:JGJ 55-2011[S].北京:中国建筑工业出版社,2011.
[15]中华人民共和国建设部,国家质量监督检验检疫总局.普通混凝土力学性能试验方法标准:GB 50081-2002[S].北京:中国建筑工业出版社,2003.
[16]周伏良,赵俊逸,杨果林.橡胶粉掺入量对混凝土基本性能的影响研究[J].混凝土,2018(1):72-75.
[17]李清富,孙振华,张海洋.粉煤灰和硅粉对混凝土强度影响的试验研究[J].混凝土,2011(5):77-79.
[18]柳颖臣,邓海斌,王海龙,等.硅灰橡胶集料混凝土力学性能试验研究[J].金华职业技术学院报,2014,5(3):55-58.
[19]刘数华,方坤河,曾力.粉煤灰在混凝土中的强度效应试验研究[J].粉煤灰综合利用,2003(5):34-35.
[20]刘志勇,李雁,李勇.粉煤灰混凝土与基准混凝土力学性能对比试验[J].徐州工程学院(自然科学版),2011,6(2):9-13.