|Table of Contents|

Effect of Double Mineral Admixtures on Flexural Strength, Impact Strength and Impermeability of GRC Members at Different Ages(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2021年04期
Page:
118-126
Research Field:
Publishing date:

Info

Title:
Effect of Double Mineral Admixtures on Flexural Strength, Impact Strength and Impermeability of GRC Members at Different Ages
Author(s):
YU Lin1;  WANG Xue-lei1;  LI Jian-bo2;  CHENG Kai1
(1. College of Mechanics and Materials, Hohai University, Nanjing 210098, Jiangsu, China; 2. Suning Real Estate Group Co., Ltd, Nanjing 210042, Jiangsu, China)
Keywords:
double mineral admixture;  GRC;  mechanical property;  impermeability;  microstructure
PACS:
TU501
DOI:
10.19815/j.jace.2020.10064
Abstract:
In practical engineering applications, glass fiber reinforced cement(GRC)specimens had some problems, such as surface microcracks, low strength and low toughness in humid environment. The accelerated aging method(50 ℃ hot water accelerated aging)was used to study the flexural strength, impact strength and impermeability of the GRC specimens with double mineral admixtures and modified universal silicon cement as the base material, and the erosion of the surface of the glass fiber mesh cloth of the GRC specimen was analyzed by scanning electron microscope. The results show that the best addition amount(mass fraction)to improve the impact strength of GRC specimen is 10% silica fume and 20% metakaolin under the accelerated aging of hot water at 50 ℃ or in the natural environment. The effect of double mixing 10% silica fume and 20% fly ash or 10% silica fume and 20% metakaolin on improving the bending strength is obvious. The impermeability of the GRC specimen with 20% fly ash and 20% metakaolin is excellent. The erosion degree of the glass fiber mesh is negatively related to the macroscopic mechanical properties, and a certain proportion of mineral admixtures can improve the corrosion resistance of the glass fiber mesh cloth and improve the microstructure of the interface zone, and the durability of the GRC specimen is greatly improved.

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Last Update: 2021-07-10