As a relatively new material, geopolymer concrete offers the benefits as a construction material for sustainable development. It utilized waste materials such as recycled concrete sludge, fly ash and etc. It has a very low rate of green house gas emission when compared to ordinary Portland cement. In this study, the component of geopolymer is concrete sludge, metakaolin and water glass, NaOH was used as alkalin activator. To improve the mechanical properties, the amount of NaOH and water glass were varied to obtain higher strength and the specimens were cured both in air and water, then their mechanical properties like compressive strength and bending strength were measured the microstructures were investigated.
To fabricate a new green building material without higher CO2 emission and much energy consumption, recycled construction waste was used as a raw material. Metakaolin was introduced as a cementitious binder instead of traditional Portland cement. NaOH and water glass mixture solution played a role of alkaline activator, then the activity of metakaolin would be released to show an excellent performance. The content of metakaolin was varied to obtain an optimal mechanical property and cost ratio. The specimens were fabricated in room, then cured in air after demoulding, robustness properties were measured which consist of compressive strength and bending strength, and their microstructures were investigated finally.
To verify the foamed warm mix asphalt mixture road property, the article formed foaming warm mix asphalt mixture, Sasobi-LM warm mix asphalt mixture, ordinary hot mix asphalt mixture test piece, comparative analysis of different asphalt mixture The resistance of high temperature to rutting, shear resistance, resistance of low temperature crack, water stability and fatigue properties, and comparative economic analysis. The results show that the resistance of low temperature crack, water stability and shear resistance of foamed warm asphalt mixture surpass Sasobi-LM warm asphalt mixture, but slightly lower than ordinary asphalt mixture; The resistance of high temperature rutting and fatigue resistance of the mixture is lower than that of Sasobi-LM warm mix asphalt mixture; through economic analysis, the economical efficiency of foamed warm mix asphalt mixture surpasses the economical efficiency of the Sasobi-LM warm mix asphalt mixture, lower than the ordinary hot mix asphalt mixture, it is recommended to choose construction in special areas.
Pure Titanium alloys are superiorities of biocompatibility, mechanical properties and chemical stability. The biocompatibility of Ti alloy is related to the surface effect. In this study, Ti Alloys were treated by alkali and acid activation process. And through the sol coating layer, biocompatibility were investigated. Consequently, it appeared that the porous layer was generated on the surface of alloy by surface treatment and sol coating process. It was found that with surface treatment on Ti alloy, the formation speed of porous was much quicker compared with those ones without treatment. Therefore, the biocompatibility was improved.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.