Open AccessInvestigation of external sulphate attacks and moisture effects on roller-compacted concrete pavement mixes containing micro silica sand powder
Author(s) -
Zahraa Alaa M. A. Ali Khan,
Assist. Dr Zena K. Abbas
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1067/1/012007
Subject(s) - durability , roller compacted concrete , materials science , absorption of water , cementitious , silica fume , portland cement , composite material , filler (materials) , cement , curing (chemistry) , flexural strength , wetting , moisture , compressive strength , geotechnical engineering , geology
External sulphate attacks (ESA) and water movement tend to produce the most deleterious effects on concrete. This study therefore aimed to investigate the durability of a roller compacted concrete (RCC) mix created with better engineering properties to be suitable for road paving. This RCC concrete has a dry consistency and low cementitious materials (cms) content. Slabs were prepared in dimensions of 380 × 380 × 100 mm by taking sulphate resistant Portland cement and replacing various proportions with silica sand powder (SSP) (5%, 10%, and 20%) on a weight-to-weight basis. Additionally, crushed stone, M-sand, filler, and water were added in appropriate proportions. The slabs were subjected to normal curing for 28 days, then sawed into prisms of 380 × 100 × 100 mm and cubes of 100 × 100 × 100 mm. Cyclic wetting at 23 ± 2°C once in 5% MgSO4 solution and then in water, followed by drying at 60°C for 30 and 60 cycles was then used to investigate the durability of the RCC specimens. Mixes with 5% SSP achieved the best results with increases of 5.46% and 35.24% for compressive (f’c) and flexural (fr) strengths, respectively, while absorption and volume of voids was decreased by 57.3% & 52.29%, respectively, after 60 cycles of MgSO4 wetting and drying, as compared to the control mix.