Green reactive powder concrete is a new type of concrete that falls into the category of ultra-high performance concrete that contains a high proportion of cementitious materials (a considerable amount of cement replacement by waste materials), as well as fine sand, quartz powder, superplasticizers, and fibers. The major goal of this research is to study the behavior of green reactive powder concrete when exposed to aggressive solutions. In this study, the work was divided into three stages: the first stage included preparing mixes by replacing cement with waste ceramic, waste glass, and waste brick powder in different percentages and selects the optimum mix. The second stage included preparing mixes of green reactive powder concrete by replacing cement with 40% with different percentages of sand and selected the optimum two mixes. The third stage included studying the behavior of selected green reactive powder concrete when exposed to aggressive solutions (sodium chloride, magnesium chloride, magnesium sulfate, and calcium sulfate) and comparing it with normal concrete.The results covered five parts: the first indicates that the green mortar containing glass powder and brick powder gives higher values of compressive strength, density, flexural and UPV, with lower flowability than green mortar containing waste glass powder and waste ceramic powder at the same replacement ratio. Moreover, the optimum replacement that gives the highest strength is a replacement of 40% (10% waste glass powder + 30% waste brick powder). The second part indicates that the best mixes for green reactive powder concrete that give higher mechanical properties than others are green reactive powder concrete containing (1: 0.8) and (1:1.1) cement to sand with 2% micro steel fibers and 1% superlasticizer Rb1070 with 0.3% de-foamer. The third part indicates that the green mortar provides a 38.2% reduction in carbon dioxide emissions. The fourth part indicates that the compressive, flexural, indirect splitting tensile strengths, static modulus of elasticity and ultra-pulse velocity of selected green reactive powder concrete increase continuously even after exposure to aggressive solutions for 90 days in comparison to normal concrete. The rate of increases may reach up to 21%. The fifth part indicates that, by XRD analysis of selected green reactive powder concrete shows that the sharp peak and most of the peaks are quartz. In addition, the SEM morphology shows that the GRPC mixes containing nanoparticles with a large amount of calcium silicate hydrate (C-S-H) and micro-steel fibers are covered with dense cementitious matrixes with good bonding between them.Key words: Green reactive powder, ceramic, glass, brick powder, aggressive solutions, and high strength green concrete.
