Recycled Fine Aggregates from Mortar Debris and Red Clay Brick to Fabricate Masonry Mortars: Mechanical Analysis

Abstract

In this research, the mechanical behavior of masonry mortars made with partial substitution of sand by recycled fine aggregates (RFAs) of mortar (MT) and recycled clay brick (RCB) was compared. Mortar specimens were built in two groups (MT and RCB) considering different replacement proportions by dry weight. To reduce the water absorption of RFAs during mortar making, the prewetting method was utilized. All the mixtures were assembled with a volumetric cement-to-aggregate ratio of 1:4 and a consistency of 175 ± 5 mm. The properties in the fresh and hardening state of mortars were analyzed separately. The experimental results showed that the properties of mortars in a fresh state (bulk density and air content) were affected if RFA was added to the mixture; however, mortars assembled with up to 40% and 50% of MT and RCB, respectively, accomplished a compressive strength value of reference for new mixtures. Both mortar groups showed good results in adhesive strength values, with the RCB mortars standing up as they achieved greater adherence than the control mortar with substitution percentages of up to 30%. Therefore, the reutilization of both RFAs is feasible, notably in rendering and bonding functions.

Nghiên cứu thực nghiệm sử dụng cốt liệu nhỏ tái chế từ khối xây gạch đỏ cho bê tông tự lèn có hàm lượng tro bay cao

“…Nghiên cứu của Mora-Ortiz và cs. [10] cho thấy sử dụng RFA tái chế từ gạch đỏ và vữa xây để thay thế một phần cho cát tự nhiên (lần lượt 20% và 30%) đáp ứng yêu cầu về cường độ nén và độ bám dính để sử dụng làm vữa xây cho các kết cấu trong nhà. Trong khi đó, Bektas và cs.…”