Durability of lightweight concrete made concurrently with waste aggregates and expanded clay

Abstract

The use of waste aggregates simultaneously with expanded clay to obtain lightweight masonry mortars in construction constitutes a good way for a more sustainable society. This research presents a study about the physical properties of the mortars fabricated with construction and demolition wastes and expanded clay as lightweight material by way of flexural and compressive strength, porosity and surface abrasion resistance. Computerized tomography and microporosity show a good distribution of materials and pores. The paper also contains an analysis of the influence in the durability after incorporating different proportions of recycled aggregates. The results indicate that the properties do not suffer significant changes in external appearance after accelerated aging tests as thermal shock, saline solution, freeze and thaw, resistance to SO2 and carbonation. No flaking, cracking, splitting or cracks in the specimen's outer surfaces being observed. Therefore, it can be confirmed that the masonry mortars tested performed well in all cases when exposed to external climatic atmospheres according to the international standards.

Mechanical Behavior of a Composite Lightweight Slab, Consisting of a Laminated Wooden Joist and Ecological Mortar

“…The cement mortars manufactured with construction waste and expanded clay, used as a compression layer in the laminated wood-mortar construction component design have previously been characterized in earlier investigations [37,38]. The relation of components by weight of the ecological mortar designs are shown in Table 1.…”

“…The relation of components by weight of the ecological mortar designs are shown in Table 1. The mortars designed with recovered construction waste and expanded clay have been studied in earlier investigations [37,38], in accordance with the specifications of the European standard. Their characteristics, both in the fresh and in the hardened state, are shown in Table 2.…”

“…In preceding works, a complete characterization of mortars designed with construction waste and expanded clay was presented, describing a material with good mechanical performance and acceptable durability levels over time. The mortar design presented good mechanical behavior, both flexural and under compression, which makes it ideal for use in lightweight structural frameworks [ 37 , 38 ].…”

Factors Affecting Brittleness Behavior of Coal-Gangue Ceramsite Lightweight Aggregate Concrete

“…For each type of LWAC, different physical properties were tested as reference data for their potential practical applications. These tested properties include: strength (Cui et al, 2012a;Ilya et al, 2018;Medine et al, 2018), density (Lau et al, 2018), elasticity (Hilal et al, 2016), shrinkage (Alexandre Bogas et al, 2015;Rumšys et al, 2017), creep (Libre et al, 2011), thermal conductivity (Nguyen et al, 2017), abrasion resistance (Real and Bogas, 2017), and adsorption (Krc, 2015;Muñoz-Ruiperez et al, 2018). Although LWAC has its superiority in high strength and low density, LWAC has more obvious brittleness compared with other ordinary concretes, which can be partially attributed to its high strength (Beygi et al, 2014;Karamloo et al, 2016).…”

Prediction of the mechanical behavior of recycled concrete with fresh concrete waste aggregate

“…Recycled aggregate concrete (RAC) represents a new kind of green concrete that effectively reduces the carbon dioxide footprint (e.g., References ). Most of the research efforts have been devoted to the utilization of RAC made with recycled coarse aggregate (RCA) and recycled fine aggregate (RFA) collected from real demolition projects to date (e.g., References ).…”