Novel Approach For Utilization Research Articles

The features of geopolymer concrete as a novel approach for utilization in green urban structures

Because of its unique qualities, concrete is the second most commonly utilized building material after water. However, there are significant downsides to the Portland cement manufacturing process, producing one ton of carbon dioxide per every ton of Portland cement. As a result, the usage of a Portland cement substitute appears to be required. On the other hand, the "waste-free" idea and the manufacturing of new materials with an environmental impact will be less important in future cities than the aims of sustainable development. To further develop environmentally friendly materials, it is vital to understand the environmental stimuli of novel materials as well as to assess the environmental effects of standard building materials. Geopolymers are ceramic-like materials with three-dimensional poly-compact structures that are made by chemically activating aluminum and silica-containing solids at low temperatures. Industrial wastes or by-products like coal combustion ash, smelting iron furnace slag, construction debris, or agricultural waste like rice husk ash can be utilized to make geopolymer concrete and construction. The present article reviews the studies on the use of geopolymer technology in sustainable materials to develop urban sustainability and reduce the emission of environmental pollutants with a life cycle assessment approach. Findings and results of studies show that geopolymer concretes have higher mechanical, chemical, and energy consumption properties than conventional concrete and offer significant environmental benefits.

A novel approach for utilization of agro-industrial waste materials as reinforcement with Al–7Si–0.3Mg matrix hybrid composite on tribological behaviour

Waste particles are the huge environmental problem facing today. This paper mainly focuses on utilization of waste particles and aspect of tribology by examining economic, environmental impact on wear loss and coefficient of friction. Aluminium with a different weight fraction of agro (RHA) and industrial (fly ash) waste particulates are fabricated by double stir-casting process. The dry sliding wear behaviour of Al alloy and aluminium hybrid composites for various applied load, sliding distance with sliding speed on wear rate and friction coefficient was conducted by pin-on-disk apparatus. The hypothesis of this study is decreasing the wear loss and coefficient of friction increasing the lifespan of material and also minimising the cost of material. Limited attempts are made on aluminium with waste particles to examine the effect of sliding wear rate. The A356/7.5%RHA–7.5% fly ash hybrid composite achieved higher wear resistance superior to the as-cast alloy.

A Novel Approach for Utilization of Ultra-Fines Iron Ore in Sintering Process

The current study presents a novel approach for the utilization of ultra-fines iron ore (−0.2 mm) in sintering process through its conversion into mini-pellets (4–9 mm). The mini-pellets were composed of ultra-fine iron ore and calcium hydrate while coke fines were used as a coating layer. One part of mini-pellets was cured with CO2 to improve the strength of green pellets while another part was kept uncured. The trails were carried out in sinter pot after adjusting the operating parameters. The utilization of 30% cured mini-pellets was accompanied by the constant highest temperature (≈1400 °C) in combustion zone. On the contrary, the sinter prepared using 30% uncured mini-pellets showed the highest temperature (≈1471 °C) at the beginning of sintering process followed by a gradual decreasing in the temperature. The permeability of sinter bed was improved by using cured mini-pellets in the sinter mixture. The sinter indices including the product yield, tumbler index and fuel consumption are measured. Reflected light microscopy, scanning electron microscopy, and X-ray diffraction analysis were used to characterize the microstructure and the developed phases.