Compressive Strength Test Evaluation of Mortar with Concrete Demolished Waste as Partial Replacement to Sand

Abstract

This study specifically examined concrete waste recycling at construction and demolition sites. Recycling considerations must be made throughout the design phase in order to expand the potential for recycling in the future. The only material that does not see significant competition from other recycled materials is concrete. Crushed stone, which is accessible, is its main rival. However, several Philippine regions, particularly Pampanga, do not generate crushed stone despite having a need for aggregates that recycled concrete could fill. Therefore, there is enough space to recycle all of the concrete produced. In most parts of Metro Manila, recycling concrete is the favored technique of management from an environmental standpoint. Additionally, the local sources of aggregate are practically worn out mandating the importation of aggregate from other quarries. The goal of this experimental investigation was to partially replace fine aggregate in a mortar mixture with crushed concrete waste. The proportions of different replacement mixture of concrete wastes will be 0%, 5%, 10%, 20% and 40%. As a result, all replacement ratio exceeded the required compressive strength of mortar according to ASTM but the best or advisable percentage of concrete waste was 20%, it has a compressive strength of 2380psi or 16.39mpa which is under Type S mortar (minimum compressive strength is 1800psi) it is appropriate for patio construction and below-grade external walls. However, recycled fine aggregates mixtures are better than to the natural fine aggregate mixture.