Fresh, mechanical and microstructural properties of alkali-activated composites incorporating nanomaterials: A comprehensive review

Geopolymer concrete is produced from the geopolymerization process, in which molecules known as oligomers integrate to form geopolymer networks with covalent bonding. Its production expends less thermal energy and results in a smaller carbon footprint compared to Ordinary Portland Cement (OPC) concrete. It requires only an alkaline activator to catalyze its aluminosilicate sources such as metakaolin and fly ash, to yield geopolymer binder for the geopolymerization to take place. Because of its eco-friendly technology and practical application, current research interest is mainly concentrated on the endurance of geopolymer concrete to resist heat and chemical aggressions. As such, it is pertinent for this review article to provide critical insight into the recent progress in research on the durability of geopolymer concrete. One significant outcome of the review is that the admixture of geopolymer concrete could be blended with additives such as micro-silica and fibers such as polypropylene fibers, to enhance its durability. The review on the durability aspects of geopolymer concrete showed that it had high compressive strength at an optimal elevated temperature, low to medium chloride ion penetrability, and high resistance to acid attack and abrasion. This makes geopolymer concrete a viable candidate to replace OPC concrete in the construction industry.

/pdf/durability-performance-of-geopolymer-concrete-a-review-v4ua00te.pdf

Durability Performance of Geopolymer Concrete: A Review

Thermal stability and microstructure of metakaolin-based geopolymer blended with rice husk ash

An intense review on the performance of Graphene Oxide and reduced Graphene Oxide in an admixed cement system

Utilization of waste rice husk ash for sustainable geopolymer: A review

Effects of graphene oxide on microstructure and mechanical properties of graphene oxide-geopolymer composites

The invention provides rice hull ash, a preparation method of the rice hull ash, a rice hull ash geopolymer and a preparation method of the rice hull ash geopolymer. The preparation method of the ricehull ash comprises the following steps: soaking rice hulls in an acid solution; taking out the rice husks, washing the rice husks to be neutral, drying the rice husks, and calcining the rice husks incalcining equipment at the temperature of 400-900 DEG C for 0.5-3 hours to obtain the rice husk ash. The invention discloses the preparation method of rice hull ash, K and other impurities hinderingrice hull combustion are removed through soaking treatment in an acid solution, the specific surface area of the rice hull ash is increased, the specific surface area is larger, the surface energy islarger, more active SiO2 is exposed, the volcanic ash activity of the rice hull ash is remarkably improved, and the content of silicon dioxide in the rice hull is remarkably increased and can reach 99.5% or above to the maximum. The rice husks are subjected to high-temperature calcination treatment, so that the content of crystalline silicon dioxide can be obviously reduced, the generation of amorphous silicon dioxide is promoted, the chemical activity is improved, and meanwhile, residual carbon is reduced.

Rice hull ash and preparation method thereof, rice hull ash geopolymer and preparation method thereof

The invention discloses an internal and external dual efficient anti-corrosion cement-based material and a preparation method thereof. A preparation method of an internal and external dual efficient corrosion-resistant cement-based material comprises the following steps: S1, uniformly mixing cement, sand, stone, water, an additive and a preservative according to certain parts by mass, and carryingout casting molding to prepare a cement-based material doped with the preservative; and S2, submerging the cement-based material doped with the preservative in the film forming liquid, and performingstanding treatment for a period of time under the illumination condition to form a protective film layer on the surface of the cement-based material, thereby obtaining the internal and external dualefficient corrosion-resistant cement-based material. According to the invention, a film forming solution containing a sensitizer and a hole trapping agent is adopted; by means of photosynthesis and biomineralization coupling, the preparation process is simple and pollution-free, wherein the formed minerals are stable in property and high in durability, carbon dioxide can be effectively captured and utilized in the preparation process, so that the greenhouse effect is relieved, and the cement-based material prepared by the method is high in strength and excellent in corrosion resistance.

Internal and external dual efficient anti-corrosion cement-based material and preparation method thereof

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Thermal stability and microstructure of metakaolin-based geopolymer blended with rice husk ash

Effects of graphene oxide on microstructure and mechanical properties of graphene oxide-geopolymer composites

Rice hull ash and preparation method thereof, rice hull ash geopolymer and preparation method thereof

Internal and external dual efficient anti-corrosion cement-based material and preparation method thereof