–Flyash based geopolymer concrete is introduced in 1979 by Davidovits to reduce the use of OPC in concrete. Geopolymer is an inorganic alumino-hydroxide polymer synthesized form predominantly silicon and aluminum materials of geological origin and by product materials such as flyash (with low calcium). In this paper an attempt is made to study strength properties of geopolymer concrete using lo...

Coal ash is the main waste from power plant. It is estimated that the consumption of the coal for power plant will increase to 240 million tons each year and the coal ash wastes will produce more than 2 million tons per year. Although the utilization of coal fly ash can be reached 74.1%, large amount of coal fly ash and bottom ash still cannot be utilized. The purpose of this research is to dev...

Abstract This study replaced fly ash with palm oil fuel (POFA) in geopolymer paste and mortar. The alkaline activator was a mixture of sodium silicate solution hydroxide ratio 2.5. Three variables were evaluated: the raw material combination (100% 25% POFA substituted to ash), mass alkali (60/40, 65/35, 70/30), NaOH molarity (8 M 10 M). mortar utilized based on highest compressive strength past...

Abstract In many crucial structural applications, a material’s ability to withstand impact is of the utmost importance. The use crumb rubber particles as partial replacement natural aggregates forms rubberized geopolymer concrete (RuGPC), which found have great resistance and energy absorption capacity. Geopolymer paste alone are weak in handling loads. field Civil engineering has been looking ...

Geopolymers are inorganic aluminosilicate materials, which have been a great research interest as material for sustainable development. However, they possess relatively low toughness properties similar to brittle solids. The limitation may be altered by fiber reinforcement improve their strength and toughness. This describes the synthesis of bamboo shaving (BS) reinforced geopolymer composites ...

In this paper, two types of sustainable cementitious composites, geopolymer and magnesium phosphate cement, are introduced. The geopolymer is a type of amorphous alumino-silicate products and magnesium cement is MgO based cementitious material. Geopolymer can be synthesized by polycondensation reaction of geopolymeric precursor, and alkali polysilicates. The MgO cement can be obtained by proper...

This paper presents the work carried out on the chemical reaction, mechanism, role of materials, applications and microstructure of fly ash geopolymer cement. Geopolymer is a type of amorphous alumino-silicate cementitious material. Geopolymer can be synthesized by polycondensation reaction of geopolymeric precursor, and alkali polysilicates. Literature demonstrates that the exact geopolymeriza...

Geopolymer concrete is a more environmentally friendly alternative than conventional because its production does not need cement. Instead, waste materials such as fly ash, rice husk slag, etc. are used. This research studies the effect of activator concentration (6–10 M), curing temperature (40–80 °C) and incorporation ratio thermally mechanically treated recycled aggregate (0–100%) on changes ...

Abstract Geopolymers have great potential to replace conventional cementitious materials and are classified as green materials. Their main constituents silica (Si) aluminum (Al), which can be found in the fly ash material from industrial processes of PLTU. The parameters that affect strength concrete influenced by molarity natrium hydroxide ratio alkalis (NaOH/Na 2 SiO 3 ). This study examined ...