Influences of Admixtures on Properties of Foam Concrete with Iron Tailings

Abstract

Iron tailings are mineral wastes obtained from industrial processing and magnetic separation of iron ore. A type of superplasticizer with high water reducing rate and early strength gaining property is characterized in this study. The influence of admixtures, i.e. superplasticizer, early strength agent and accelerating agent, on the mechanical strength, setting and hardening time of foam concrete containing iron tailings has been investigated. Further, the microstructure of foam concrete is observed. This study demonstrates high-strength foam concrete with excellent thermal insulation property can be prepared using iron tailings, cement, fly ash, silica fume, polypropylene fiber, superplasticizer, early strength agent, accelerating agent and foaming agent, which develops a new route for the comprehensive utilization of iron tailings.

Weathering of Roofing Insulation Materials under Multi-Field Coupling Conditions

“…Therefore, the thermal conductivity and the rate of mass loss can be determined using the macroscopic indices of the weathering resistance of thermal insulation materials [1,2,3,4,5]. Incorporating different proportions of mineral admixtures in insulation materials and then analyzing the influence of microscopic changes on the thermal conductivity of the materials using scanning electron microscopy is common, and based on this information, a new composite insulating material was developed [6,7,8,9,10]. Kalapathy et al [11] conducted cyclic freeze–thaw testing of insulation materials, and measured changes in the thermal conductivity of such materials.…”

Effect of Alkali Activator on Preparation, and Mechanical and Thermal Properties of Iron Mine Tailing-Based Lightweight Materials

“…Lightweight construction materials have attracted widely attention owing to their favorable physical and chemical properties such as light weight, water and fire resistance, low cost, durability, good thermal insulation and sound dampening performance. [8][9][10][11][12] In this study, iron mine tailing-based lightweight materials applied for building and construction were synthesized by using waste iron mine tailings (WIMT) as raw materials, commercial silicate cement (CSC) as cementing agent, NaOH as alkali activator and triethanolamine lauryl sulfate (TLS) as foaming agent via foam-gelcasting for the first time. Microstructure and physical and thermal properties of as-prepared iron mine tailing-based lightweight materials were investigated.…”