Abstract
Green concrete (GC) was developed for realizing sustainable development, recycling waste materials, and reducing environmental pollution. For the practical use of GC, various harmful materials must blocked from entering its cracks and pores; and its strength and durability must be improved. The use of an inorganic coating material (ICM) for GC effectively prevents the intrusion of harmful materials and repairs the concrete. ICMs can reduce the permeability and increase the durability of concrete. This study investigated GC, construction waste, and ICMs and used recycled sand and gravel as well as construction waste as substitutes for cement. The results indicate that the coarse aggregate substitution, water-binder ratio, and recycled fine aggregate substitution must be controlled suitably in GC. Furthermore, the coating layer, fine aggregate substitution, and aging of the ICM mut be controlled suitably. GC with an ICM showed poorer performance than conventional concrete, mainly because of the high porosity. Nonetheless, the ICM somewhate reduces the porosity and resists the penetration of chloride ions, thereby promoting concrete quality.
Highlights
Reinforced concrete is the main material used in construction projects [1,2]
This study examined whether the combination of Green concrete (GC), industrial waste, and an inorganic coating material (ICM) can overcome this problem and achieve a sustainable protection function [34,35,36,37,38,39]
The physical properties of GC coated with an ICM show that when recycled coarse and fine particles and photoelectric glass powder are used to replace ordinary particles or cement, the porosity may become higher owing to incomplete hydration, resulting in lower compressive strength and a higher absorption value
Summary
Reinforced concrete is the main material used in construction projects [1,2]. Cement is an important binding material for concrete. The cement industry has considerable energy consumption, and large amounts of carbon dioxide are emitted. Effectively reducing cement consumption will help reduce energy consumption and carbon dioxide emissions. Toward this end, cementitious materials with low energy consumption and low pollution must be developed to replace ordinary Portland cement. Green materials have been incorporated into conventional concrete [3,4,5,6,7,8]. A robust recycling mechanism must be established for realizing sustainable development. Doing so will satisfy the basic requirements of construction projects in terms of economic benefits, environmental protection, and energy conservation; reduce environmental impact and damage; and realize sustainable development
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