Journal of Jilin University(Engineering and Technology Edition) ›› 2020, Vol. 50 ›› Issue (2): 648-653.doi: 10.13229/j.cnki.jdxbgxb20190006

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Effect of admixture on properties of GRC under hydrothermal curing conditions

Juan HE1(),Cong-mi CHENG1(),Yi-nan YANG1,Ya-fang ZHANG1,Ming-feng ZHONG2   

  1. 1.School of Civil Engineering, Guangzhou University, Guangzhou 510006, China
    2.School of Materials Science & Engineering, South China University of Technology, Guangzhou 510640, China
  • Received:2019-01-04 Online:2020-03-01 Published:2020-03-08
  • Contact: Cong-mi CHENG E-mail:10319919@qq.com;congmi2008@sina.com

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Abstract:

The corrosion of glass fiber and time-dependent change of mechanical properties of glass fiber reinforced Portland cement (GRC) with or without admixture were studied by accelerated aging method with 80 ℃ hydrothermal curing. The results show that the time-dependent change of GRC mechanical properties is caused by the combined effect of cement mortar strength growth and glass fiber corrosion damage. With the extension of curing time, on the one hand, the strength of cement mortar with fly ash keeps increasing; on the other hand, fly ash inhibits the corrosion of glass fiber. As a result, the bending strength of GRC with fly ash keeps rising despite the corrosion of glass fiber. Accelerated aging test showed that the inhibition effect of fly ash on glass fiber corrosion is better than slag. It exhibited a brittle behaviour with slight corrosion of glass fiber. Hydrating phases within and around glass fibers will lead to the loss of toughening effect. So, it is more effective to evaluate degradation of GRC by the change of GRC toughness than by the change of strength.

Key words: building materials, hydrothermal curing, glass fiber reinforced cement, mineral admixture, corrosion, toughness, fly ash

CLC Number: 

  • TU528.581

Table 1

Mix proportion of GRC and reference mortar"

样品编号配合比/(kg·m-3)
水泥粉煤灰矿渣砂玻璃纤维水
SF11 0000094060360
SF2600400094060360
SF3600040094060360
S11 000001 0000360
S260040001 0000360
S360004001 0000360

Fig.1

Relationship between flexural strength and hydrothermal curing time of GRC and reference mortar"

Fig.2

Micromorphology of glass fiber in GRC without admixture at different hydrothermal curing ages"

Fig.3

Micromorphology of glass fiber in GRC with fly ash at different hydrothermal curing ages"

Fig.4

Micromorphology of glass fiber in GRC with slag at different hydrothermal curing ages"

Fig.5

Load-deflection curves of GRC under different curing conditions"

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