The improvement of setting time and early strength of fiber-reinforced concrete with high-volume fly ash

The improvement of setting time and early strength of fiber-reinforced concrete with high-volume fly ash
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高掺量粉煤灰提高纤维混凝土凝结时间和早期强度

DOI:
10.1080/15685543.2013.767066
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发表时间:
2013-03
影响因子:
2.6
通讯作者:
Xu, C.
Xu, C.
中科院分区:
材料科学4区
文献类型:
--
作者:
Wu, Y.;Sun, Q.;Guo, Y.;Li, W.;Xu, C.

文献摘要

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工程胶凝复合材料(ECC)是一种基于微力学设计的高性能纤维增强胶凝复合材料,具有高延性和耐久性,表现为单轴拉伸下的应变硬化行为。然而,大量粉煤灰的掺入会延缓ECC的凝结时间,降低其早期强度。因此,缩短凝结时间,提高HVFA-ECC的抗弯强度具有明显的经济意义。对HVFA-ECC的凝结时间和抗弯强度进行了试验研究,结果表明,添加碱促进剂可缩短凝结时间,最佳掺量为4.0%,而添加细粒粉煤灰、改性粉煤灰或添加粉煤灰激发剂均可提高HVFA-ECC的抗弯强度。
An engineered cementitious composite (ECC) is a micromechanically based designed high-performance fiber-reinforced cementitious composite with high ductility and durability, represented by strain-hardening behavior in uniaxial tension. However, the setting time of ECC is retarded and early strength is decreased due to the presence of high volume of fly ash (HVFA). Therefore, shortening the setting time and increasing flexural strength of HVFA-ECC will be of obvious economic importance. The experimental study on setting time and flexural strength of HVFA-ECC proved that the setting time can be shortened by adding alkali accelerator and the optimum content is 4.0%, while the flexural strength of HVFA-ECC can be increased by applying fine particles fly ash, modified fly ash or adding exciting agent of fly ash.
DOI: 10.4028/www.scientific.net/kem.302-303.68
发表时间: 2005-12
期刊: Key Engineering Materials
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