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中南大学学报(自然科学版)

Journal of Central South University

第51卷    第1期    总第305期    2020年1月

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文章编号:1672-7207(2020)01-0014-09
振动搅拌工艺制备轻质高强钢纤维混凝土
罗为,熊光启,熊晨晨,郑亚林,王冲

(重庆大学 材料科学与工程学院,重庆,400030)

摘 要: 通过一种新型的振动搅拌方式制备轻质高强钢纤维混凝土(SFHSLC),设置5组钢纤维体积掺量,并与普通强制搅拌方式对比,探讨不同搅拌方式对SFHSLC坍落度、干表观密度、抗压强度、劈裂抗拉强度和弯曲韧性的影响。研究结果表明:与普通搅拌相比,振动搅拌下纤维混凝土坍落度增加10 mm以上,混凝土干表观密度增加明显;钢纤维掺量从0增加至2.0%时,普通搅拌制备的SFHSLC抗压强度在纤维掺量为1.0%时达到最大,而振动搅拌制备的SFHSLC抗压强度随纤维掺量增加持续增长;2种搅拌方式制备的SFHSLC劈裂抗拉强度都随纤维掺量增加而提高,但不同掺量条件下的劈裂抗拉强度都是振动搅拌比普通搅拌的大。在相同钢纤维掺量下,振动搅拌可以明显提高SFHSLC的抗弯强度和裂后韧性。振动搅拌方式可以改善钢纤维的分布状况,比普通搅拌更适合用于SFHSLC的制备。

 

关键字: 振动搅拌工艺;轻质高强钢纤维混凝土;弯曲韧性;纤维分散

Preparation of steel fiber reinforced high strength lightweight concrete using vibration mixing technology
LUO Wei, XIONG Guangqi, XIONG Chenchen, ZHENG Yalin, WANG Chong

School of Materials Science and Engineering, Chongqing University, Chongqing 400030, China

Abstract:A new type of vibration mixing method was used to prepare steel fiber reinforced high strength lightweight concrete(SFHSLC), and five groups of steel fiber contents were considered. Compared with ordinary mixing method, the effects of different mixing method on slump, dry density, compressive strength, splitting tensile strength and flexural toughness of SFHSLC were investigated. The results show that compared with the ordinary mixing, the slump of the fiber concrete is increased by more than 10 mm during vibration and the dry density of the concrete is increased significantly; when the steel fiber content is increased from 0 to 2.0%, the compressive strength of SFHSLC prepared with ordinary mixing reaches the maximum with a fiber content of 1.0% while the compressive strength of SFHSLC prepared by vibration mixing continues to increase with the increase of fiber content. The splitting tensile strength of SFHSLC prepared by the two mixing methods both increase with the increase of fiber content. However, the splitting tensile strength prepared with vibration mixing is higher at each fiber content. At the same steel fiber content, vibration mixing significantly improves the flexuralstrength and post-cracking toughness of SFHSLC. The vibration mixing method improves the distribution of steel fiber, which is more suitable for the preparation of SFHSLC than ordinary mixing.

 

Key words: vibration mixing technology; steel fiber reinforced high strength lightweight concrete; flexural toughness; fiber dispersion

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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