Experimental Evaluating of the Physical, Mechanical and Durability Properties of Natural, Recycled and Both Combined Aggregates Based Concretes  

作　　者：Etienne Malbila Arba A.T. Ouedraogo Nicolas Kagambega Gilbert G. Nana Sié Kam David Y. K. Toguyeni Etienne Malbila;Arba A.T. Ouedraogo;Nicolas Kagambega;Gilbert G. Nana;Sié Kam;David Y. K. Toguyeni(Ecole Supérieure d’Ingénierie (ESI), Université de Fada N’Gourma (UFDG), Fada-N’Gourma, Burkina Faso;Laboratoire d’Energies Thermiques Renouvelables (LETRE), Université Joseph KI ZERBO, Ouagadougou, Burkina Faso;Laboratoire de Géosciences et Environnement (LaGE), Université Joseph KI ZERBO, Ouagadougou, Burkina Faso;Laboratoire de Physique et Chimie de l’Environnement (LPCE), Université Joseph KI ZERBO, Ouagadougou, Burkina Faso;Ecole Polytechnique de Ouagadougou (EPO), Ouagadougou, Burkina Faso)

机构地区：[1]Ecole Supérieure d’Ingénierie (ESI), Université de Fada N’Gourma (UFDG), Fada-N’Gourma, Burkina Faso [2]Laboratoire d’Energies Thermiques Renouvelables (LETRE), Université Joseph KI ZERBO, Ouagadougou, Burkina Faso [3]Laboratoire de Géosciences et Environnement (LaGE), Université Joseph KI ZERBO, Ouagadougou, Burkina Faso [4]Laboratoire de Physique et Chimie de l’Environnement (LPCE), Université Joseph KI ZERBO, Ouagadougou, Burkina Faso [5]Ecole Polytechnique de Ouagadougou (EPO), Ouagadougou, Burkina Faso

出　　处：《Materials Sciences and Applications》2023年第3期117-141,共25页材料科学与应用期刊（英文）

摘　　要：This experimental study aims at the reuse of recycled aggregates (RA), resulting from the demolition of concrete, cement block and cement mortar, in the manufacture of common construction in Burkina Faso. The RA can readily replace natural aggregates in concrete. Then five formulations of natural and recycled aggregates based concrete for characteristic strength of 25 Mpa were prepared in addition to the natural aggregates base concrete named reference concrete (BN): two types of recycled aggregates concrete (BR), three types of recycles and natural combined aggregates base concrete (BC). The properties of natural and recycled aggregates were characterized and the physical, mechanical strength and durability properties were also evaluated for all concrete specimens. All the studied concrete formulation present a density between 2000 kg/m³ ≤ ρ ≥ 2600 kg/m³ and an average slump of 4.9 ± 0.1 cm. The obtained results indicate that the recycled aggregates are suitable for current concrete. Two out of the five combinations studied, such as the natural (BN) and combined aggregate (BC2) based concretes satisfy the mechanical characteristics (Rc₂₈ > 25 MPa) at 28 days of age and an average absorption coefficient of 2.93% and 3.98%. The recycled aggregate based concrete (BR1, BR2) and combined aggregate based concrete (BC1), gave respective average compressive strength of 21.55 MPa, 20.50 MPa and 20.30 MPa, i.e. a difference of 13.80% to 18.80% under the characteristic strength (25 MPa) aimed at 28 days of age. Thus, the recycled aggregates are in conformity with the normative prescriptions and their use for standard concrete gives adequate physical, mechanical and durability properties for the production of the C20/25 concrete series in the common civil engineering applications.This experimental study aims at the reuse of recycled aggregates (RA), resulting from the demolition of concrete, cement block and cement mortar, in the manufacture of common construction in Burkina Faso. The RA can readily replace natural aggregates in concrete. Then five formulations of natural and recycled aggregates based concrete for characteristic strength of 25 Mpa were prepared in addition to the natural aggregates base concrete named reference concrete (BN): two types of recycled aggregates concrete (BR), three types of recycles and natural combined aggregates base concrete (BC). The properties of natural and recycled aggregates were characterized and the physical, mechanical strength and durability properties were also evaluated for all concrete specimens. All the studied concrete formulation present a density between 2000 kg/m³ ≤ ρ ≥ 2600 kg/m³ and an average slump of 4.9 ± 0.1 cm. The obtained results indicate that the recycled aggregates are suitable for current concrete. Two out of the five combinations studied, such as the natural (BN) and combined aggregate (BC2) based concretes satisfy the mechanical characteristics (Rc₂₈ > 25 MPa) at 28 days of age and an average absorption coefficient of 2.93% and 3.98%. The recycled aggregate based concrete (BR1, BR2) and combined aggregate based concrete (BC1), gave respective average compressive strength of 21.55 MPa, 20.50 MPa and 20.30 MPa, i.e. a difference of 13.80% to 18.80% under the characteristic strength (25 MPa) aimed at 28 days of age. Thus, the recycled aggregates are in conformity with the normative prescriptions and their use for standard concrete gives adequate physical, mechanical and durability properties for the production of the C20/25 concrete series in the common civil engineering applications.

关 键 词：Concrete Demolition Waste Aggregate Recycled Aggregate Strength Water Absorption 

分 类 号：TU5[建筑科学—建筑技术科学]