The effects of different proportions of green-colored waste glass (WG) cullet on the mechanical and fracture properties of selfcompacting concrete (SCC) were experimentally investigated. Waste bottles were collected, washed, crushed, and sieved to prepare the cullet used in this study. Cullet was incorporated at different percentages (0%, 20%, 40%, 60%, 80%, and 100% by weight) instead of natural fine aggregate (NFA) and/or natural coarse aggregate (NCA). Three SCC series were designed with a constant slump flow of 700 ± 30 mm, total binder content of 570 kg/m 3 and at water-to-binder (w/b) ratio of 0.35. Moreover, fly ash (FA) was used in concrete mixtures at 20% of total binder content. Mechanical aspects such as compressive, splitting tensile, and net flexural strengths and modulus of elasticity of SCC were investigated and experimentally computed at 28 days of age. Moreover, failure characteristics of the concretes were also monitored via three-point bending test on the notched beams. The findings revealed that the mechanical properties as well as fracture parameters were adversely influenced by incorporating of WG cullet. However, highest reduction of compressive strength did not exceed 43% recorded at 100% WG replacement level. Concretes containing WG showed less brittle behavior than reference concrete at any content.
In this experimental study, the shrinkage characteristics of self‐compacting concrete were investigated when using green colored recycled glass (RG) as a replacement of natural aggregates (NAs). For this purpose, fine and/or coarse grade NAs were replaced by RG at 0, 20, 40, 60, 80, and 100%, by weight. Three SCCs series were designed with a constant slump flow of 700 ± 30 mm, total binder content of 570 kg/m3 and at water‐to‐binder (w/b) ratio of 0.35. Moreover, fly ash (FA) was used in concrete mixtures at 20% of total binder content. Fresh properties of mixtures were experimentally investigated in terms of slump flow diameter, T500 slump flow time, V‐funnel flow time, and L‐box height ratio. The findings indicated that the flowability is increased by increase of slump flow, but viscosity is increased as well as what decreases workability. While, the results of physical properties of self‐compacting glass concrete concluded that the RG reduces the free shrinkage, weight loss and restrained shrinkage until the age of 50 days.
Geopolymer concrete was presented to produce alternative binder to cement. This study considered the influence of silica fume on the properties of metakaolin based geopolymer mortar exposed to high temperature up to 800 °C. Five mortar mixes were used with silica fume replacing level of 0, 10, 20, 30 and 40% of weight of metakaolin. The results demonstrated that the compressive and splitting tensile strength increased with increasing the silica fume replacing level up to 40% of weight of metakaolin for all burning temperature and the absorption was decreased with it. The outcomes also demonstrated that for the same mix the compressive and splitting tensile strength improved with increment burning temperature up to 400 °C and reduced with increasing the temperature above it until 800 °C.
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