A study on the mix proportion of fiber-polymer composite reinforced cement-based grouting material

Abstract

Cement-based grouting materials are widely used to repair slab hollows under cement concrete pavement slabs. However, the existing cement-based grouting materials fail to meet the needs of rapid penetration reinforcement. In this paper, a cement-based grouting material, which is reinforced by fiber-polymer composite and with excellent characteristics of high permeability and micro expansion, is proposed to repair slab hollows between the cement concrete slab and cement stabilized base. Firstly, take the fluidity, compressive strength and flexural strength as the evaluation indexes and determine the reasonable mixing amount of each component by single mixing tests. Secondly, take the water-cement ratio, early strength agent content, modified fiber content and VAE polymer content as object factors and optimize the mix proportion of the grouting material by orthogonal tests. The effectiveness of the proposed grouting materials is identified by indoor model tests, and the results show that the mechanical properties of the proposed materials (including compressive strength and flexural strength) are improved significantly compared with ordinary grouting materials.