Study on the influence of volcanic ash modification on alkaline portland cement
- Vol.96(8), Aug
- Mumbai ACC LTD 2022
- 37-44p.
This paper used volcanic ash as the chief modifier to improve Portland cement. The effect of raw material proportioning on compressive strength, slump, and mass loss of cement was investigated. The results revealed that with the decrease of the amount of volcanic ash, the slump of the sample reduces gradually. The amount of volcanic ash is 445~544 kg/m3, and the slump is in a moderate position, which can have a good strength (48.84~64.55 MPa) under suitable construction difficulty. When the mass ratio of volcanic ash, cement, sodium hydroxide, and sodium silicate is 433:76:60:6, the strength of the specimens reached up to 69.86 MPa. The mass loss of different groups to reach stability was almost the same, and the mass loss of all groups reached the relative stability level in about 30 days. Nevertheless, the addition of volcanic ash increased the mass loss of cement specimens. While the ratio of volcanic ash, cement, sodium hydroxide, and sodium silicate is 445:78:49:4, the slump is 153 mm and can have sufficient strength (62.19 MPa) under decent construction challenge, it is recommended for practical application.