Abstract
Due to conventional aggregates resources depletion, material recycling has become an economic and ecologic alternative. In this paper, locally available natural residues such as olive pomace were investigated, when partially incorporated in the concrete formulation, since the mechanical characteristics of lightweight aggregate concrete strongly depend on its properties and proportions. Lightweight aggregates are more deformable than the cement matrix because of their high porosity, and their influence on the concrete strength remains complex. The purpose of this paper is to investigate the aggregates properties on lightweight concrete mechanical behaviour through an experimental approach. In addition, the different substitution sequences and the W/C ratio on lightweight concrete behaviour were evaluated, in order to determine the W/C ratio influence on the improvement of the lightweight concrete mechanical properties while knowing that the mixing water quantity gives the cement paste manoeuvrability and mechanical strength effects. The last part of this paper, therefore, was to provide statistical survey for estimating strength and weight reduction through the different natural aggregate substitutions to improve the lightweight concrete properties. The results achieved in a significant olive-pomace lower adhesion with the matrix after the cement setting, making the lightweight concrete mechanical strength weak. However, this work can open several perspectives: Results modeling and correlation with an experimental approach, the evolution and determination of lightweight concrete characteristics when exposed to high temperatures and thermohydric properties.
Highlights
In this article, we wish to show that the building sector, being so polluting, can become an ecological lung in terms of recycling waste to obtain ecological concrete
In order to improve the processing and the compaction, and to reduce the concrete porosity, many tests have been carried out on the water content measurement of lightweight concrete by making hydrostatic weighing tests on olive pomace-based lightweight concrete at 60 ° C, the results shown in “Fig. 5” show that the drying temperature affects the material characteristics, the prewetting of the lightweight aggregates proved to be an essential part in the manufacture of lightweight concrete by granting it a long-term fundamental kinetics affecting the hydration of the cement
The main objective of this study is to technically demonstrate the possibility to use aggregates in the manufacture of ecological concrete
Summary
We wish to show that the building sector, being so polluting, can become an ecological lung in terms of recycling waste to obtain ecological concrete. In the construction of a certain number of structures, weight reducing lead to general cost-savings, concrete density may vary between 0.5 to 2 when using lightweight aggregates, but because the concrete has less density, its compressive strength is lower [1]. Conventional aggregate resources are becoming increasingly depleted over the years, especially in the Saharan areas. These materials are expensive to store and storage sites are scarce, environmental standards restrict the use of toxic materials. More processing is required for materials originating from natural environment involving treatment and crushing stations, and the cost of natural aggregate manufacture is high. That’s why part of material recycling remains the best and effective option. That’s why part of material recycling remains the best and effective option. [2]
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