钢渣对碱激发偏高岭土材料强度影响分析
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摘要
在水玻璃激发偏高岭土胶凝体系中,加入不同掺量的磨细钢渣,考察不同钢渣掺量对碱激发偏高岭土基复合胶凝材料的7 d抗折、抗压强度的影响,并对其影响机理进行分析。结果表明:随着钢渣掺量的增大,碱激发偏高岭土基复合胶凝材料的7 d抗折、抗压强度呈先增大后减小的趋势;当钢渣掺量在5%时,复合材料的7 d抗折强度达到最大值8.59 MPa,相较于空白组提高了10.2%;当钢渣掺量在7.5%时,复合材料的7d抗压强度达到最大值54.81 MPa,相较于空白组提高了20.9%;钢渣中的游离氧化钙与水反应生成氢氧化钙,对偏高岭土有一定的激发效果,进而提高碱激发偏高岭土基复合胶凝材料的力学强度。
In the water glass-excited metakaolin clay system, different amounts of ground steel slag were added to investigate the effect of different steel slag content on the 7 d flexural and compressive strength of alkali-activated metakaolin-based composite cementitious materials. The mechanism of influence is analyzed. The results show that with the increase of steel slag content, the 7 d flexural and compressive strength of alkaliactivated metakaolin-based composite cementitious materials increases first and then decreases. When the amount of steel slag is 5%, the composites The 7 d flexural strength reached a maximum of 8.59 MPa, which was 10.2% higher than that of the blank group. When the steel slag content was 7.5%,the 7 d compressive strength of the composite reached a maximum of 54.81 MPa, which was improved compared with the blank group. 20.9%; the free calcium oxide in the steel slag reacts with water to form calcium hydroxide, which has a certain excitation effect on metakaolin, and then improves the mechanical strength of the alkali-activated metakaolin-based composite cementitious material.
In the water glass-excited metakaolin clay system, different amounts of ground steel slag were added to investigate the effect of different steel slag content on the 7 d flexural and compressive strength of alkali-activated metakaolin-based composite cementitious materials. The mechanism of influence is analyzed. The results show that with the increase of steel slag content, the 7 d flexural and compressive strength of alkaliactivated metakaolin-based composite cementitious materials increases first and then decreases. When the amount of steel slag is 5%, the composites The 7 d flexural strength reached a maximum of 8.59 MPa, which was 10.2% higher than that of the blank group. When the steel slag content was 7.5%,the 7 d compressive strength of the composite reached a maximum of 54.81 MPa, which was improved compared with the blank group. 20.9%; the free calcium oxide in the steel slag reacts with water to form calcium hydroxide, which has a certain excitation effect on metakaolin, and then improves the mechanical strength of the alkali-activated metakaolin-based composite cementitious material.
引文
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[2]王鹏云,杨永亮,王林浩,等.偏高岭土对水泥土强度及渗透系数的影响[J].科学技术与工程,2018(10):112-116.
[3]乔春雨,倪文,王长龙.较大偏高岭土掺量下偏高岭土-水泥硬化浆体性能与微观结构[J].建筑材料学报,2015,18(3):393-399.
[4]李福海,张桂斌,周鸿屹,等.高活性偏高岭土及粉煤灰对碱骨料反应的抑制作用[J].建筑材料学报,2017(6):876-880.
[5]KIM H S,LEE S H,MOON H Y.Strength properties and durability aspects of high strength concrete using Korean metakaolin[J].Construction&Building Materials,2007,21(6):1229-1237.
[6]NICOLAS R S,CYR M,ESCADEILLAS G.Performance-based approach to durability of concrete containing flash-calcined metakaolin as cement replacement[J].Construction&Building Materials,2014,55(3):313-322.
[7]彭晖,崔潮,蔡春声,等.激发剂浓度对偏高岭土基地聚物性能的影响机制[J].复合材料学报,2016,33(12):2952-2960.
[8]朱江,李国忠,王英姿.高掺量低碱度钢渣-脱硫石膏胶凝材料的制备[J].粉煤灰,2013,25(6):25-26.
[9]WU S,XUE Y,YE Q,et al.Utilization of steel slag as aggregates for stone mastic asphalt(SMA)mixtures[J].Building&Environment,2007,42(7):2580-2585.
[10]郑娟荣,覃维祖,张涛.碱-偏高岭土胶凝材料的凝结硬化性能研究[J].湖南大学学报(自然科学版),2004,31(4):60-63.