No abstract

Kaolin samples were collected to study the mineralogical, texture, chemical composition, thermal behavior, and treatment and also the possibility to convert kaolinite mineral into metakaolin and use it as a natural pozzolanic and/or as geopolymer materials. Kaolinite is the main constituent of clay mineral, which related to many of the chemical weathering of parent rocks and complete leaching of alkali elements under warm, humid to semi-arid climatic conditions. However, quartz, anatase, and iron oxide are considered non-clay minerals. Cement substituted by metakaolin under different ratios in the concrete industry was carried out to enhance the physical and mechanical properties of the concrete. The best results are detected at 10% and 15% of cement replacement by metakaolin. Geopolymer production using Metakaolin (MK) was mixed with NaOH and Na2O-3SiO2 to replace the Portland cement in the concrete industry and the obtained results are suitable and match with the green building material concept.

The target of the present paper is to study the enhancement effect of MWCNT on geopolymer resistivity to chloride attack. Geopolymer composites were made from metakaolin and ground granulated blast furnace slag and to either 10 % silica fume or glass waste. The added MWCNT were in the ratio of 0.01: 0.09 % by weight. Results revealed the high resistivity and stability against magnesium chloride solution; in addition glass waste mixes acquired high mechanical strength as compared with silica fume mixes as related to the high amorphous structure as well as high finesty of glass waste as compared with silica fume. The results revealed an increased enhancement in characteristics of geopolymer composites with MWCNT up to 0.07 % in both matrices.