High-strength concrete containing RHA and nano-CaCO 3

Micro & nano letters

article

Yahya Rahbar¹  Seyed Yasin Mousavi²  Heydar Dashti Nasserabadi¹ 

[1] Department of Civil Engineering, Chalous Branch, Islamic Azad University;Department of Civil Engineering, Faculty of Engineering, Golestan University

关键词: calcium compounds;    compressive strength;    cements (building materials);    concrete;    ash;    waste recovery;    recycling;    nanoparticles;    specimen preparation;    electrical resistivity;    crushing;    hydrogen compounds;    high-strength concrete;    nanocalcium carbonate;    electrical resistivity;    rice husk ash;    slump;    compressive strength;    crushing process;    water absorption;    sulphuric acid solution;    Portland cement;    chloride ion penetration depth;    sample preparation;    time 84.0 d;    time 28.0 d;    H2SO4;    CaCO3;   

DOI  :  10.1049/mnl.2019.0281

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

The properties of high-strength concrete (HSC) containing rice-husk ash (RHA) and nanocalcium carbonate (nano-CaCO 3 ) is evaluated. For this purpose, various HSC samples containing 0–20% RHA and 0–1.5% nano-CaCO 3 were prepared and investigated for the slump, compressive strength, absorption, electrical resistivity, chloride penetration depth and sulphuric acid (H 2 SO 4 ) attack resistance. Results indicated that by a ternary combination of Portland cement (PC) + 10% RHA + 0.5% nano-CaCO 3 , it is able to produce HSC with 28 days compressive strength of 101.7 MPa, which was 15% higher than that of estimated for plain HSC. Additionally, substituting optimum level of nano-CaCO 3 in HSC containing RHA could improve the electrical resistivity and reduce the water absorption and chloride ion penetration depth compared with binary use of PC + RHA. A lower mass loss has been determined for the ternary combination of PC + RHA + nano-CaCO 3 at all immersion times in 5% H 2 SO 4 solution as compared with plain HSC. Moreover, considering HSC samples exposed to H 2 SO 4 solution at the age of 84 days, it can be seen that the presence of nano-CaCO 3 in HSC containing RHA did not necessarily contribute to a significant reduction in the crushing load loss percentage compared with the binary use of PC + RHA.

【 授权许可】

CC BY|CC BY-ND|CC BY-NC|CC BY-NC-ND