Experimental investigation of an ecological concrete developed with calcareous silica brick and basalt fibers for the reduction of CDW (#425)

Authors

Escobar Jorge, Efraín

Meza Gala, Yaquelin Ketty

Eyzaguirre Acosta, Carlos Augusto

Abstract

Limestone silica bricks are one of the most predominant elements in construction and demolition waste, significantly contributing to the total amount of solid waste generated worldwide. In Peru, the prevailing practice of directly disposing of these waste materials in landfills is attributed to the lack of management alternatives and a limited understanding of sustainable options for utilizing these materials. Concurrently, the substantial CO2 emissions from cement industries significantly contribute to global greenhouse gas emissions, resulting in climate changes, Arctic ice melting, disruptions in biodiversity of animals and plants, droughts, and other phenomena. Recent research has focused on the use of supplementary cementitious materials to reduce cement production. This study specifically aims to evaluate sustainable concrete through the incorporation of crushed limestone silica brick waste and basalt fibers. To achieve this, consultation with various bibliographic sources was conducted to gather information on material properties and optimal percentage additions. Subsequently, dosing was carried out for concrete with a strength of 34.34 MPa (350 Kg/cm2). Four concrete mixtures were investigated, incorporating 5% and 10% crushed limestone silica brick, reinforced with 0.5% basalt fibers. Properties such as compressive strength and diametral tensile strength were analyzed at 7, 14, and 28 days. The results, in terms of mechanical behavior, indicate a slight improvement of 2.1% compared to conventional concrete. Additionally, control tests, including temperature, unit weight, air content, and concrete settlement, support the feasibility of the proposed concrete. Regarding the CO2 emission reduction indices for sustainable concrete, a reduction of 56.33 Kg of CO2 per cubic meter of concrete was achieved.