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钢渣微粉对超高性能水泥基复合材料性能的影响
Influence of Steel Slag on Properties of Ultra-high Performance Cementitious Composites(UHPCC) Materials
2016年第12期
钢渣微粉;超高性能水泥基复合材料;火山灰活性;水化热;流动度;力学性能
Steel slag; UHPCC; Pozzolanic reactivity; Heat of hydration; Fluidity; Mechanical properties
2016年第12期
1000-4637(2016)12-13-07
国家重大发展计划973项目(2015CB655102);国家自然科学重点项目(51438003);国家自然科学基金面上项目(51378113);江苏省“六大人才高峰”B类高层次人才选拔培养资助项目(JZ-004)。
王 虹1,郭丽萍1,2,孙 伟1,2,马 瑞1
1.东南大学材料科学与工程学院,南京 211189;2.江苏省土木工程材料重点实验室, 先进土木工程材料协同创新中心,南京 211189)

王 虹1,郭丽萍1,2,孙 伟1,2,马 瑞1

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摘 要:研究了钢渣微粉的火山灰活性和不同掺量对低水胶比超高性能水泥基复合材料的水化热、流动度、抗折强度、抗压强度的影响规律。试验结果表明,钢渣微粉具有比较高的火山灰活性,28d的活性指数可达到87.1;钢渣微粉掺量为10%时,累积放热量达到最大;当钢渣微粉掺量大于10%时,随着掺量的增加,累积放热量随之减少;钢渣微粉颗粒近似球体,会提高极低水胶比超高性能水泥基复合材料的流动度;钢渣微粉的掺入使超高性能水泥基复合材料的抗折强度先增加后减小,钢渣微粉掺量为10%的超高性能水泥基复合材料抗折强度最高,高达25.8MPa;钢渣微粉掺量在0~20%内,抗压强度略有降低,但仍可满足超高性能水泥基复合材料强度要求。证明了钢渣微粉可作为胶凝材料制备极低水胶比超高性能水泥基复合材料的可能性。 Abstract: The pozzolanic reactivity of steel slag, the effects of different steel slag contents on heat of hydration, fluidity, flexural strength and compressive strength of ultra-high performance cementitious composites (UHPCC) were investigated. Experiment results indicate that the steel slag has higher pozzolanic reactivity up to 87.1 at 28 days. When 10% of the cement is replaced by steel slag powder, the fresh paste achieves the maximum of hydration heat, and the hydration heat decrease with the increase of replacing quantity of steel slag. The spherical morphology of steel slag leads to the increase of the fluidity of fresh paste. With the increase of replacement rate of steel slag, the flexural strength of UHPCC increases first then decreases, the flexural strength of UHPCC with the replacement of 10% cement can reach 25.8MPa at the highest. In addition, the compressive strength of UHPCC with the steel slag in 0~20% decreases slightly while still meets the UHPCC strength requirements, which prove the possibility of steel slag can be used as a sustainable cementitious material.
英文名 : Influence of Steel Slag on Properties of Ultra-high Performance Cementitious Composites(UHPCC) Materials
刊期 : 2016年第12期
关键词 : 钢渣微粉;超高性能水泥基复合材料;火山灰活性;水化热;流动度;力学性能
Key words : Steel slag; UHPCC; Pozzolanic reactivity; Heat of hydration; Fluidity; Mechanical properties
刊期 : 2016年第12期
DOI :
文章编号 : 1000-4637(2016)12-13-07
基金项目 : 国家重大发展计划973项目(2015CB655102);国家自然科学重点项目(51438003);国家自然科学基金面上项目(51378113);江苏省“六大人才高峰”B类高层次人才选拔培养资助项目(JZ-004)。
作者 : 王 虹1,郭丽萍1,2,孙 伟1,2,马 瑞1
单位 : 1.东南大学材料科学与工程学院,南京 211189;2.江苏省土木工程材料重点实验室, 先进土木工程材料协同创新中心,南京 211189)

王 虹1,郭丽萍1,2,孙 伟1,2,马 瑞1

摘要
参数
结论
参考文献
引用本文

摘   要:研究了钢渣微粉的火山灰活性和不同掺量对低水胶比超高性能水泥基复合材料的水化热、流动度、抗折强度、抗压强度的影响规律。试验结果表明,钢渣微粉具有比较高的火山灰活性,28d的活性指数可达到87.1;钢渣微粉掺量为10%时,累积放热量达到最大;当钢渣微粉掺量大于10%时,随着掺量的增加,累积放热量随之减少;钢渣微粉颗粒近似球体,会提高极低水胶比超高性能水泥基复合材料的流动度;钢渣微粉的掺入使超高性能水泥基复合材料的抗折强度先增加后减小,钢渣微粉掺量为10%的超高性能水泥基复合材料抗折强度最高,高达25.8MPa;钢渣微粉掺量在0~20%内,抗压强度略有降低,但仍可满足超高性能水泥基复合材料强度要求。证明了钢渣微粉可作为胶凝材料制备极低水胶比超高性能水泥基复合材料的可能性。

Abstract: The pozzolanic reactivity of steel slag, the effects of different steel slag contents on heat of hydration, fluidity, flexural strength and compressive strength of ultra-high performance cementitious composites (UHPCC) were investigated. Experiment results indicate that the steel slag has higher pozzolanic reactivity up to 87.1 at 28 days. When 10% of the cement is replaced by steel slag powder, the fresh paste achieves the maximum of hydration heat, and the hydration heat decrease with the increase of replacing quantity of steel slag. The spherical morphology of steel slag leads to the increase of the fluidity of fresh paste. With the increase of replacement rate of steel slag, the flexural strength of UHPCC increases first then decreases, the flexural strength of UHPCC with the replacement of 10% cement can reach 25.8MPa at the highest. In addition, the compressive strength of UHPCC with the steel slag in 0~20% decreases slightly while still meets the UHPCC strength requirements, which prove the possibility of steel slag can be used as a sustainable cementitious material.

关键词:
钢渣微粉;超高性能水泥基复合材料;火山灰活性;水化热;流动度;力学性能
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(1)钢渣微粉早期火山灰活性较小,后期具有较高的火山灰活性,28d的活性指数可达到87.1。
(2)钢渣微粉掺量为10%时,新拌浆体的水化热流峰最高,累积放热量也达到最大。当钢渣微粉掺量大于10%时,随着掺量的增加,水化放热速率随之减慢,累积放热量也减少,说明钢渣微粉可显著降低水泥浆体的水化热。
(3)钢渣微粉颗粒大小均匀,形状近似球体,试验结果证明该球形外观有助于增加新拌超高性能水泥基复合材料的流动度。
(4)试验结果证明,钢渣微粉可作为胶凝材料制备低水胶比超高性能水泥基复合材料。当钢渣微粉掺量为20%时,蒸养3d超高性能水泥基复合材料的抗折强度最大,达到25.8MPa,抗压强度下降了3.7%,但仍可达到127.2MPa。
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