This paper discusses the potentialities of using waste bricks as a partial replacement of clinker in blended cement. The blended cements are produced by grinding and mixing clinker, waste brick and gypsum. Eight mixtures containing 0 to 35% of bricks as a clinker replacement are prepared and characterized. Partially replacing clinker by brick results in early strength, but are lower than that of the reference. However, at 90 days, the strengths are greater than that reference. The setting times and the shrinkages were reduced. Blended cement has been formulated with optimal composition of 10% of waste brick. The microstructure of the paste was studied using scanning electron microscopy and the evolution of cement hydration was studied by Fourier transform infrared spectroscopy. It was concluded that the binder with 10% of brick shows a dense and homogeneous particles distribution. The pozzolanic reaction occurs through the decreases of the amorphous silica during hydration.
The work presented in this paper aims to study the durability of mortars, in which part of the sand has been replaced with rubber aggregates from used tires and have undergone a surface treatment with a sodium hydroxide solution (NaOH). The substitution rates studied are 10%, 17.5%, and 25%. The results are compared with ordinary mortar and mortars with untreated rubber aggregates while samples with the same substitution rates were used. To do this, the following properties have been studied: compressive strength, flexural tensile strength, water absorption by capillarity, water absorption by total immersion, water-accessible porosity, water permeability, and resistance to the chemical degradation by sulfuric acid H2SO4. The results obtained show that the treatment of rubber aggregates by the solution method (NaOH) presented a considerable improvement in mechanical performance (increase in compressive strength and flexural tensile strength) and better durability compared to reference mortar and mortar with untreated rubber granulate.
This research work discusses both the physical and durability characteristics of newly blended cement containing waste crushed brick. This waste is used as a partial substitution for clinker in cement. Thus, blended cements are obtained by grinding and homogenizing clinker, waste brick, and gypsum. Four compositions containing 0%, 10%, 20%, and 30% of waste materials were prepared and submitted to various characterization tests. The introduction of brick powder improved the physical characteristics, therefore; it improved the mechanical properties and durability performance of the new cement compared to the reference, prepared with 0% addition. More particularly, it resisted sulfuric acid (H2SO4) attack after fixation of portlandite by pozzolan.
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