Abstract

A large number of natural aggregates are used in the field of construction materials, resulting in the exhaustion of natural aggregates. Therefore, looking for an alternative will slow down the consumption of natural aggregates. The sintering method not only consumes a lot of energy to prepare aggregates but also produces a lot of pollutants. In this study, silico-manganese (SM) slag was dried, ground into powder, and used as raw material. Solid and liquid alkaline activator methods were used to prepare SM slag non-burning aggregate (SMNA) by the cold bonding method. The effects of grinding time, amounts of solid and liquid alkaline activators, curing temperature, and the amount of added fly ash on aggregate properties were investigated. The aggregate microstructure was characterized by XRD, SEM, and FTIR methods, and the toxic leaching analysis of aggregate was performed. The results showed that with a fixed amount of liquid activator (16.2% wt.) and solid activator (15% wt.) and fly ash (20% wt.), respectively, and curing was performed at room temperature, the aggregate properties were optimal: the bulk density of 1236.6–1476.9 kg/m3 and the water absorption lower than 4.9–5.5%. The apparent density was 1973.1–2281.6 kg/m3, and the bulk crushing strength was 24.7–27.9 MPa. The XRD, SEM, and FTIR results indicated that amorphous gel could be formed from SM under an alkaline activator, improving the aggregate strength. The results of toxic leaching showed that the aggregate prepared from SM exhibited environmentally friendly characteristics. The SMNA was obtained via the simple and low-energy consumption production process, paving the new way toward large-scale utilization of SM.

Highlights

  • Concrete is an indispensable building material in construction engineering

  • It has been reported that industrial solid wastes such as fly ash (FA) [5], ground granulated blast furnace slag (GGBFS) [6], and steel slag [7] are used to prepare aggregates to replace some natural aggregates in concrete

  • Using solid waste in artificial aggregate instead of natural aggregate is an effective way to reduce the consumption of non-renewable resources

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Summary

Introduction

Concrete is an indispensable building material in construction engineering. Aggregate is abundant in the concrete mix [1], accounting for about 70% wt. [2]. It has been reported that industrial solid wastes such as fly ash (FA) [5], ground granulated blast furnace slag (GGBFS) [6], and steel slag [7] are used to prepare aggregates to replace some natural aggregates in concrete. The novel SMNA can effectively alleviate the demand for natural aggregate in the construction field, paving the new way for the large-scale application of SM slag. This technology is of great significance to solve the problem of massive accumulation of SM slag. It is significant to protect the limited natural building aggregate resources and reduce the over-exploitation of stone mountains

Experimental Material
Figure slag size is in
Physical and Mechanical Characterisation
Process Flow of SM Granulation
Process of SM
Liquid Activator Granulation Process
Conservation Process of SMNA
Pelletization Mechanism
Effect of the Grinding Time on SMNA
Influence of the Curing Temperature on the Properties of SMNA
Influence of the Alkaline Activator on the Properties of SMNA
Influence of the FA Amount on the Properties of SMNA
Granulation Efficiency
XRD Analysis
13. XRD upon curing for 28for days:
O5 diffraction
Findings
Conclusions
Full Text
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