S.K. Saxena

Bio: S.K. Saxena is an academic researcher from Sharda University. The author has contributed to research in topics: Geopolymer & Fly ash. The author has an hindex of 6, co-authored 8 publications receiving 136 citations.

Effect of Alccofine powder on the properties of Pond fly ash based Geopolymer mortar under different conditions

Abstract: As the most widely used synthetic material on the planet, concrete poses a serious societal concern regarding its significant environmental footprint. There is a global urgency to develop innovative strategies to develop greener concrete with improved strength and durability. In recent years, scientists are interested to have OPC free concrete to reduce CO2 emission. One of the major breakthroughs is the preparation of geopolymer cement. In this paper geopolymer cement was made by activating Pond fly ash (a waste of thermal power plant) with 14 M NaOH and sodium silicate solutions. Natural Ennore sand was used to make the mortar. Alccofine powder was added during geopolymerization process, which increased the compressive strength in a similar way as silica fume. Curing was done at different temperatures in an oven and in microwave oven. Curing in microwave oven gave high compressive strength in shorter period. Powder X-ray diffraction, heat evolution profile, TG studies, compressive strength measurements and SEM studies were made to characterize the geopolymer. Durability test in sulphuric acid was conducted and it was observed that the geopolymer mortars were much more durable as compared to the control. The results have been discussed.

Influence of alkali solutions on properties of pond fly ash-based geopolymer mortar cured under different conditions

Abstract: Waste management of pond fly ash containing heavy metals beyond optimum limit is essential, otherwise leaching in the soil, water and air will create many hazardous problems. The best way to utilise pond fly ash is to convert it into geopolymer cement. Geopolymers form a class of binders manufactured by activation of solid aluminosilicate source material with a highly alkaline activating solution and aided by thermal curing. In the past few decades, geopolymer binders have emerged as one of the possible alternatives to ordinary Portland cement binders due to their reported high early strength and resistance against acid and sulfate attack apart, from their environmental friendliness. An experimental study was conducted to assess the activating influences of the combination of different alkali hydroxides and silicates (NaOH/Na2SiO3, NaOH/Li2SiO3, KOH/Na2SiO3 and KOH/Li2SiO3) on the mechanical properties of mortars. Geopolymer mortars using sand were cured at 80°C for 4, 8 and 12 h and compressive strengths...

Review on the research progress of cement-based and geopolymer materials modified by graphene and graphene oxide

Abstract: Abstract In recent years, with the higher requirements for the performance of cement-based materials and the call for energy conservation and environmental protection, a wave of research on new materials has set off, and various high-performance concrete and more environmentally friendly geopolymers have appeared in the public. With a view to solving the defects of energy consumption, environmental protection and low toughness of traditional cement-based materials. At the same time, nanomaterials have become a focus of current research. Therefore, the research on the properties of cement-based materials and geopolymers modified by graphene and its derivatives has aroused extensive interest of researchers. Graphene-based nanomaterials are one of them. Because of their large specific surface area, excellent physical properties have been favored by many researchers. This paper reviews the research progress of graphene-based nanomaterials in improving the properties of cement-based materials and geopolymer materials, and points out the main challenges and development prospects of such materials in the construction field in the future.