改性硅灰、粉煤灰对超高性能混凝土（UHPC）性能的影响

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发布时间：2020-01-06 00:00:00

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改性硅灰、粉煤灰对超高性能混凝土（UHPC）性能的影响

Influence of Modified Silica Fume or Fly Ash on the Performance of Ultra-high Performance Concrete (UHPC)

2021年第11期

超高性能混凝土；辅助胶凝材料；自分散颗粒；工作性；抗压强度；硅灰；粉煤灰

Ultra-high performance concrete; Supplementary cementitious material; Self-dispersing particle; Workability; Compressive strength; Silica fume; Fly ash

2021年第11期

10.19761/j.1000-4637.2021.11.001.06

国家自然科学基金资助项目（U1604117）。

王东明1，张世宇1，姚苏皖1，邹定华1,2

1.河南理工大学材料科学与工程学院，河南焦作 454000；2.河南理工大学河南省深地材料科学与技术重点实验室，河南焦作 454000

王东明1，张世宇1，姚苏皖1，邹定华1,2

王东明,张世宇,姚苏皖,等.改性硅灰、粉煤灰对超高性能混凝土（UHPC）性能的影响[J].混凝土与水泥制品,2021(11):1-5,11.

WANG D M,ZHANG S Y,YAO S W,et al.Influence of Modified Silica Fume or Fly Ash on the Performance of Ultra-high Performance Concrete (UHPC)[J].China Concrete and Cement Products,2021(11):1-5,11.

浏览量:

1000

摘要：为降低超高性能混凝土（UHPC）黏度、提高工作性，采用辅助胶凝材料（硅灰、粉煤灰）和硅烷（γ-缩水甘油醚氧丙基三甲氧基硅烷、十二烷基三甲氧基硅烷）进行改性制备了自分散颗粒，并研究了其对UHPC工作性、抗压强度及微观结构的影响。结果表明：自分散颗粒降低了UHPC的黏度，提高了工作性；不同自分散颗粒对UHPC工作性的影响有较大差别，其中，粉煤灰和十二烷基三甲氧基硅烷制备的自分散颗粒效果最好；自分散颗粒抑制胶凝材料的早期水化，降低UHPC早期抗压强度；不同自分散颗粒对UHPC的28 d抗压强度影响也各不相同，采用粉煤灰和十二烷基三甲氧基硅烷制备的自分散颗粒提高了UHPC的28 d抗压强度，其他自分散颗粒降低了28 d抗压强度。 Abstract: In order to reduce viscosity and promote workability of fresh ultra-high performance concrete(UHPC), self-dispersing particles were prepared by using supplementary cementitious materials(fly ash and silica fume) modified by silanes( γ-glycidoxypropyltrimethoxysilan and dodecyltrimethoxysilane), and the workability, compressive strength and microstructure of UHPC were investigated. The results show that viscosity of fresh UHPC decreases, and the workability increases when self-dispersing particles are employed. The influence of different self-dispersing particles on workability is quite different. Self-dispersing particles prepared from fly ash modified by dodecyltrimethoxysilane show the highest effectiveness. Early age hydration of cementitious materials is inhibited by self-dispersing particles and compressive strength of UHPC decreases. Different self-dispersing particles have different effects on the 28 d compressive strength of UHPC. Self-dispersing particles prepared from fly ash and dodecyltrimethoxysilane increase the 28 d compressive strength of UHPC, while other self-dispersing particles reduce the 28 d compressive strength of UHPC.

英文名 : Influence of Modified Silica Fume or Fly Ash on the Performance of Ultra-high Performance Concrete (UHPC)

刊期 : 2021年第11期

关键词 : 超高性能混凝土；辅助胶凝材料；自分散颗粒；工作性；抗压强度；硅灰；粉煤灰

Key words : Ultra-high performance concrete; Supplementary cementitious material; Self-dispersing particle; Workability; Compressive strength; Silica fume; Fly ash

刊期 : 2021年第11期

DOI : 10.19761/j.1000-4637.2021.11.001.06

文章编号 :

基金项目 : 国家自然科学基金资助项目（U1604117）。

作者 : 王东明1，张世宇1，姚苏皖1，邹定华1,2

单位 : 1.河南理工大学材料科学与工程学院，河南焦作 454000；2.河南理工大学河南省深地材料科学与技术重点实验室，河南焦作 454000

王东明1，张世宇1，姚苏皖1，邹定华1,2

王东明,张世宇,姚苏皖,等.改性硅灰、粉煤灰对超高性能混凝土（UHPC）性能的影响[J].混凝土与水泥制品,2021(11):1-5,11.

WANG D M,ZHANG S Y,YAO S W,et al.Influence of Modified Silica Fume or Fly Ash on the Performance of Ultra-high Performance Concrete (UHPC)[J].China Concrete and Cement Products,2021(11):1-5,11.

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摘要

参数

结论

参考文献

引用本文

摘要：为降低超高性能混凝土（UHPC）黏度、提高工作性，采用硅烷（γ-缩水甘油醚氧丙基三甲氧基硅烷、十二烷基三甲氧基硅烷）对辅助胶凝材料（硅灰、粉煤灰）进行改性制备了自分散颗粒，并研究了其对UHPC工作性、抗压强度及微观结构的影响。结果表明：自分散颗粒降低了UHPC的黏度，提高了工作性；不同自分散颗粒对UHPC工作性的影响有较大差别，其中，粉煤灰和十二烷基三甲氧基硅烷制备的自分散颗粒效果最好；自分散颗粒抑制胶凝材料的早期水化，降低UHPC早期抗压强度；不同自分散颗粒对UHPC的28 d抗压强度影响也各不相同，采用粉煤灰和十二烷基三甲氧基硅烷制备的自分散颗粒提高了UHPC的28 d抗压强度，其他自分散颗粒降低了28 d抗压强度。

Abstract: In order to reduce viscosity and promote workability of fresh ultra-high performance concrete(UHPC), self-dispersing particles were prepared by using supplementary cementitious materials(fly ash and silica fume) modified by silanes( γ-glycidoxypropyltrimethoxysilan and dodecyltrimethoxysilane), and the workability, compressive strength and microstructure of UHPC were investigated. The results show that viscosity of fresh UHPC decreases, and the workability increases when self-dispersing particles are employed. The influence of different self-dispersing particles on workability is quite different. Self-dispersing particles prepared from fly ash modified by dodecyltrimethoxysilane show the highest effectiveness. Early age hydration of cementitious materials is inhibited by self-dispersing particles and compressive strength of UHPC decreases. Different self-dispersing particles have different effects on the 28 d compressive strength of UHPC. Self-dispersing particles prepared from fly ash and dodecyltrimethoxysilane increase the 28 d compressive strength of UHPC, while other self-dispersing particles reduce the 28 d compressive strength of UHPC.

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改性硅灰、粉煤灰对超高性能混凝土（UHPC）性能的影响

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