Influence of Silica Fume on the Performance of Moderately Weathered Phonolite Concrete

Xu Wu ,Zhaoxi Tang

doi:10.1051/e3sconf/202129302032

Abstract

The effect of silica fume on the performance, mechanical properties, durability and air tightness of airtight concrete was studied. The results showed that with the increase of silica fume content, the concrete performance will decrease, the compressive strength of airtight concrete will increase first, and reach the highest when the silica fume content was 8%, and then it will decrease gradually. With the increase of silica fume content, the corrosion resistance coefficient of concrete increased gradually, then decreased. The permeability coefficient of concrete decreases with the increase of silica fume content, and the air tightness of concrete was improved obviously; In the project, it was advisable to use silica fume to prepare airtight concrete, and the amount of silica fume should be controlled at 4% - 8%.

Highlights

The main line of the Kenya Nairobi Expressway Project has a total length of 27km and a design speed of 80 kilometres per hour
Rocks in Nairobi and the surrounding areas are dominated by igneous rocks, of which medium weathered sonic rock accounts for a relatively large proportion
At the 7d, the compressive strength of the benchmark concrete with a silica fume content of 0% was 29.7MPa, and the test groups G4, G6, G8, and G8 with a silica fume content of 4%, 6%, 8%, 10%, and 12% G10 and G12 were respectively 12.5%, 20.2%, 27.3%, 21.5% and 15.5% higher than the compressive strength of the benchmark concrete

Summary

Introduction

The main line of the Kenya Nairobi Expressway Project has a total length of 27km and a design speed of 80 kilometres per hour. It is a national highway A-class highway with asphalt concrete pavement. The 15.710km front of the main line is mainly subgrade, and the rear 11.421km is mainly bridge. Rocks in Nairobi and the surrounding areas are dominated by igneous rocks, of which medium weathered sonic rock accounts for a relatively large proportion. Sonic rock is available around the project. Other rock quarries are far away and costly, and the surrounding sonic rock has problems such as high water absorption and poor solidity [1,2]

Methods

Results

Conclusion