Effect Analysis of Soil Type and Silt Content on Silt-Based Foamed Concrete with Different Density.

Hongbo Zhang,Yufeng Bi,Jintao Yu,Jie Song,Chuanyi Ma,Jianqing Wu,Xiaolin Qi,Renjuan Sun,Dongdong Xie

doi:10.3390/ma13173866

Abstract

This paper investigates the influence of silt content and coarse particle content on the mechanical and physical properties of foamed concrete, including compressive and flexural strength, modulus of elasticity, water absorption, drying shrinkage, and air-void structure. Four types of silt with different coarse particle contents were obtained by soil mixing. The results showed that high density, low silt content, and high coarse particle content can provide better mechanical properties. High silt content and high coarse particle content would lead to lower drying shrinkage. Silt content was the main factor affecting the pore distribution of foamed concrete, and higher coarse particle content could optimize the air-void structure. Meanwhile, the change in air-void structure can accordingly affect the water absorption of foamed concrete. Results showed that, at the same density and silt content, higher coarse particle content can optimize the physical and mechanical properties of foamed concrete.

Highlights

Foamed concrete refers to a type of lightweight material formed by mixing cement-based cementitious material, water, foam, and aggregate according to a certain proportion
This paper investigates the effects of the silt coarse particle content, silt content, and wet density on the physical and mechanical properties of silt-based foamed concrete, such as water absorption, drying shrinkage, scanning electron microscopy (SEM), compressive strength, flexural strength, and elastic modulus
The experimental results of this investigation revealed the feasibility of widely applying silt-based foamed concrete, and the following conclusions can be drawn: (1)

Summary

Introduction

Foamed concrete refers to a type of lightweight material formed by mixing cement-based cementitious material, water, foam, and aggregate according to a certain proportion It has the characteristics of light weight (density of 400–1850 kg/m3 ), high strength, excellent acoustic and thermal isolation, high resistance to fire, lower cost of raw materials, high flowability, and easier pumping and application [1,2,3]. Used foamed concrete is mainly divided into four categories It is used as non-structural filling material in ground works, because of its flowability features, higher strength, and thermal properties. It is a superlative material for voids such as old sewers, storage tanks, basements, piping, and voids under roadways [4]. At last, foamed concrete can be combined with steel reinforcement as the main structural element [8,9]

Methods

Results

Conclusion