Heah Cheng Yong

A Review on Mechanical Properties of Geopolymer Composites for High Temperature Application

Geopolymer is cementitious binder that has enormous potential to become an alternative to ordinary Portland cement (OPC). Geopolymer composites have the potential to substantially curb the carbon dioxide (CO2) emissions. Kaolin, metakaolin, slag and fly ash have been used as the prime materials for forming geopolymers composites. Geopolymers have been studied for the past decade due to its unique properties such as low shrinkage, substantially chemical resistance, and higher fire resistance. The geopolymer offer an innovative for coating application at higher thermal application. Based on historical review, geopolymer materials exhibit resistance to corrosion, abrasion and heat. This paper summarizes some research finding about alkali-activated binders over the past decades along with outlines of the potential of geopolymer composites for high temperature application.

Review of Soil Stabilization Techniques: Geopolymerization Method one of the New Technique

This paper studies the effectiveness of soil stabilizer on the problematic soil or soft soil. It is subjected to instability and massive primary and long term consolidation settlements when subjected to even moderate load increases. The purpose of this study is to review the techniques and materials that have been used in the soil stabilization by previous researchers. The performance of the soil stabilizer for stabilization by means of strength has been highlighted in this study. Unconfined compressive strength (UCS) test was carried out on stabilized soil samples and the results that obtained were discussed. The use of these techniques and materials may provide an inexpensive and advantageous construction process. As a conclusion, the strength of soil can be increased by using these materials and techniques in soil stabilization. This paper gives a comprehensive report on stabilization techniques and materials that have been used for soft soil and also discuss the potential of geopolymerization technology to be one of the new soil stabilization techniques.

Fire Resistant Properties of Geopolymers: A Review

This paper presents fire and thermal properties on geopolymer binders, composed of metakaolin, slag and fly ash as precursor. Geopolymers are inorganic polymeric materials that are believed being capable to resist heat, high temperature and fire. Based on the previous researches, geopolymers offer a feasible alternative to fire resistance applications and with further deep studies, it has great potential to be fabricated for engineering applications.

Correlation of the Processing Parameters in the Formation of Granulated Ground Blast Furnace Slag Geopolymer

Geopolymers are inorganic materials with huge potential applications including building material, fire resistant materials, and agricultural construction materials. Various parameters influenced the final properties of these geopolymer concretes. This study developed the effects of several factors such as solid-to-liquid ratio, NaOH concentration, and Na2SiO3/NaOH ratio on the compressive strength of granulated ground blast furnace slag (GGBFS) by statistical design of experiment (DOE) approach. Analysis of the experimental results through ANOVA exhibited that the specimen with NaOH concentration of 10M, Na2SiO3/NaOH ratio equals to 2.5, and solid-to-liquid ratio of 3.0 curing at room temperatures for 28 days was potential of highest strength (168.705 MPa) in the considered procedure. Besides, the relationship between compressive strength and influential factors could be suitably by fraction factorial design method.

Manufacturing parameters influencing fire resistance of geopolymers: A review

Geopolymers exhibit various unique properties and characteristics, including high compressive strength, high temperature stability, and low thermal conductivity. As a relatively new and perspective material, the behavior of geopolymers subjected to high temperatures is being intensively studied nowadays. This review summarizes the recent achievements in the development of geopolymer-based fire resistance materials. Technological parameters, which influence thermal behavior of geopolymer-based materials, are also discussed. Besides that, recent applications of geopolymers according to their composition are presented.

Synthesis of Alum from Discarded Aluminium Beverage Cans

This study provides a chemical process that recycles waste aluminium cans to alum crystals that has plenty applications in industry today. The study was performed with concentrated acidic and alkaline solution containing principal components K+ and SO42- ions. It involved the dissolution of aluminium can in KOH solution, neutralization by H2SO4 solution and cooling crystallization to produce alum crystals. Emphasis was placed on the percentage yield of alum and recovery of aluminium from waste aluminium can to useful product. The result obtained the highest yield of 80% when 1.5M of KOH solution and 9M of H2SO4 solution were used with 5 g of aluminium beverage cans. When the concentration of KOH and H2SO4 solution was increased, the yield of alum production was also increased. It was found that the crystallization process was effective in recovering aluminium in the form of alum from waste aluminium beverage cans.