Optimization of Cellular Concrete Formulation with Aluminum Waste and Mineral Additions

Mohammed Salah Bouglada,Belagraa Larbi,Noui Ammar

doi:10.28991/cej-2021-03091721

Mohammed Salah Bouglada, Belagraa Larbi + Show 1 more

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https://doi.org/10.28991/cej-2021-03091721

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Abstract

The paper aims to study cellular concrete with a new approach of formulation without an autoclave, with the use of aluminum waste and incorporation of mineral additions into the sand and evaluate its physical and mechanical properties. In this experimental study, two types of cellular concrete are prepared, based on crushed and dune sand with the incorporation of 15% of the slag and 10% of pozzolana, as sand replacement. An experimental program was performed to determine the compressive strength at 28 days, the density and thermal conductivity of the confected cellular concrete. The obtained results showed that concretes prepared with crushed sand developed better mechanical resistance compared to the dune sand. It is also noted that the concretes containing the mineral additions provide a substantial increase in compressive strength in particular slag. Furthermore, cellular concretes with sand dunes offer better thermal conductivity, compared to those with crushed sand. The use of the additions reduces the Water/Binder (W/B) ratio and leads to a lower thermal conductivity regardless of the used sand nature. The outcome of the present study here in could present a modest contribution for the production of cellular concrete with local materials in particular dune sand, active mineral addition and aluminum waste. The physical and mechanical properties obtained from this new composition are estimated acceptable compared to those of the industry-prepared cellular concrete product. Doi: 10.28991/cej-2021-03091721 Full Text: PDF

Highlights

In recent years, cellular concrete is widely used as it has the potential to be an alternative to ordinary concrete, it reduces dead loads on the structure and contributes to energy conservation and reduces production and labour costs during construction and transport [1] and for the development of new raw materials of cement, foaming agents and fillers for specific applications of cellular concrete
Analysis of the results obtained and illustrated in the histogram (Figure 8) showed that sand-based concretes containing active mineral additions, in particular blast furnace slag, offer the best compressive strength compared to sand-based control cellular concrete
These results are consistent with a similar recent study [23] that has been conducted on the incorporation of active additions such as slag and pozzolana into the particle size skeleton of sand for mortar and which has proven the effect of additions in improving the compressive strength of the mortar

Summary

Introduction

Cellular concrete is widely used as it has the potential to be an alternative to ordinary concrete, it reduces dead loads on the structure and contributes to energy conservation and reduces production and labour costs during construction and transport [1] and for the development of new raw materials of cement, foaming agents and fillers for specific applications of cellular concrete. The main advantages of cellular concrete compared to conventional Portland cement concrete are weight reduction up to 80%; excellent acoustic and thermal isolation; high resistance to fire; lower costs in raw materials, easier pumping and application; and it does not need compacting, vibration or levelling [4] It is either a cement paste or a mortar, classified as lightweight concrete, its construction applications as light and semi-structural material are becoming more frequent [5, 6]. A curing treatment, usually a hydrothermal synthesis, promotes the formation of tobermorite C5S6H5 (calcium silicate) by reaction of the lime on the silica In their current range of density (400 to 600 kg/m3), these materials have an acceptable compromise in terms of thermal insulation and mechanical performance, the thermal conductivity of such materials remains between 0.1-0.3 W/m.°K. The mechanical properties are sufficient to guarantee the use of constructive block concrete with a structural role on one or two-stage heights (compressive strength of 4 to 7 MPa) [9, 10]

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