The paper reports a process for synthesis of γ-alumina from kaolin. Kaolin was transformed to meta-kaolin by calcination at 800 ̊C for 2h. γ-alumina powder was synthesized through extracting alumina from metakaolin via H2SO4 and meta-kaolin reactions and consequently precipitation in ethanol, which led to form the aluminum sulfate. The precipitated aluminum sulfate was dried and calcined at 900 ̊...

The preparation and characterization of metakaolin-based geopolymer mortars containing an organic epoxy resin are presented here for the first time. The specimens have been prepared by means of an innovative in situ co-reticulation process, in mild conditions, of commercial epoxy based organic resins and geopolymeric slurry. In this way, geopolymer based hybrid mortars characterized by a differ...

The influence of elevated temperatures on the properties concrete is significant for study fire resistance as well identifying how isolated vessels, chimneys, and containers in nuclear reactors respond under service conditions. present experimental investigation assesses containing Metakaolin (MK) that has been exposed to temperatures. For this purpose, seven mixes were prepared, including one ...

Abstract The paper presents a study of the current state autoclaved aerated concrete production. Global trends market confirm tendency to reduce density wall blocks from 400–500 kg/m 3 300–350 . At same time their strength level is required be maintained. search for inexpensive and available local effective pozzolanic additives may increase economic ecological attractiveness AAC performed studi...

The extensive consumption of aluminum, combined with the shortage existing raw materials, and particularly bauxite, necessitates exploitation alternative materials for production alumina. present paper focuses on possible use kaolin, as an abundant, cheap high-aluminum content material, in alumina production, via application Aranda-Mastin technology leaching step. From this point view, experime...

Fiber reinforced concrete (FRC) has been widely used due to its advantages over plain concrete such as high energy absorption, post cracking behaviour, flexural and impact strength and arresting shrinkage cracks. But there is a weak zone between fibers and paste in fiber reinforced concretes and this weak zone is full of porosity, especially in hybrid fiber reinforced concretes. So it is necess...

The use of cementitious products isincreasing in the world,Thusreplacement part of cement with pozzolanic materials reduced energy consumption and preserve natural resources and the environment and also improve the mechanical properties and durability of the cement mortar.Furthermore Nano technology has promptedto tremendous developments in technology of building materials in recent yearsso use...

In this study, the valorization potential of Polish laterite leaching residues through alkali activation with use NaOH and Na2SiO3 solutions as activators was investigated. The effect main factors, namely H2O/Na2O molar ratio in activating solution, curing temperature, ageing period on properties produced activated materials (AAMs) assessed. experimental results showed that AAMs sufficient comp...

Landfilled phosphogypsum would cause severe environmental issues, but the waste can be recycled for preparing excess-sulphate cement, an eco-friendly alternative to conventional cement. This paper investigates effect of metakaolin (0–50%) on early hydration, phase assemblages and mechanical properties cementitious materials (ESPCMs). Results indicate that is related a new exothermic peak signif...

To improve the ability of concrete structures to resist freeze-thaw damage in cold environments, explore effect and mechanism nano-metakaolin (NMK) on frost resistance concrete. And make up for deficiencies mechanical properties deformation process na-no-metakaolin environments. Rapid cycle experiment was car-ried out detect deterioration law Physical under environment measured. The modificatio...