Eco-friendly concrete using by-products as partial replacement of cement

Abstract

The current challenge facing the construction industry is to produce sustainable concrete at the lowest feasible cost. One obstacle to that is the demand for an excessive amount of cement. The reduction of cement content can be achieved by its partial replacement with by-product materials that attain an appropriate pozzolanic index. Two by-products namely; Ceramic waste powder (CWP) and rice husk ash (RHA) are remarkably formed throughout tiles and rice production. Using these by-products as a partial substitution for cement reduces landfills, the cost of concrete, and climate change due to cement production. This paper investigates the effect of replacing 5%, 15%, 20%, 25%, and 30% of cement with CWP. Varied proportions of RHA; 5%, 10%, 15%, and 25% were added to the mix with the optimum CWP. The concrete mixture was proportioned to produce M35-grade concrete. Properties of concrete were assessed concerning workability, compressive, splitting tensile, and flexural strength. The results are compared to conventional concrete with 0% replacement. Results identified that 20% substitution of cement by CWP is the optimum percentage. It increases the compressive, splitting tensile, and flexural strength by 11%, 20%, and 12.5% respectively. Increasing the percentage up to 30% has minor effect on tensile and flexural strength but has destructive effect on compressive strength. Blending cement with CWP and RHA additionally improves the mechanical properties. The combination of 20% CWP/10% RHA propose superior strength, it increases the compressive, tensile, and flexural strength by 14%, 28%, and 19% compared to the control concrete.

Behavior of self-compacting concrete with technological advances in the application of new materials and their influence on the behavior of its physical-mechanical properties: A Review

“…Esta investigación de literatura presenta una revisión del tipo sistemática (RS), (20,22,23,24) las revisiones sistemáticas son esenciales para recopilar información precisas y fiables, además de ser relacionadas con la eficacia y la seguridad de las investigaciones. Por tal motivo, la búsqueda de la información se encontró y se realizó la revisión de 50 artículos de investigación científica, de los cuales se seleccionó 30 mediante criterios que van de acuerdo con el objeto de estudio de la investigación.…”

“…(17) Es necesario cambios e innovación para involucrar al capital humano, utilizando herramientas de gestión basada en competencias para monitorear la construcción y determinar el nivel de riesgo de los edificios existentes para abordar los desafíos actuales. (18,19,20,21) Uno de los mayores problemas en el concreto autocompactante es la fisuración ante cualquier movimiento sísmico, es por ello por lo que dentro de la nueva tecnología del concreto implica conocimientos científicos que son justificados mediante la aplicación de fibras. La investigación representa una mezcla del concreto autocompactante con la incorporación de macro y microfibras del material de polipropileno.…”

Study of the Pozzolanic Reactivity of Sugar Cane Straw Ashes (SCSA) Burned under Controlled Conditions

“…They all share the common feature of containing SiO 2 , Al 2 O 3 , K 2 O and Fe 2 O 3 as the main components in their composition, although the main oxide is CaO in WA [7]. RHA is still the most studied waste for being employed as pozzolan [8][9][10][11]. Hassan et al [9] studied substituting up to 20% of cement for RHA to fabricate concrete.…”