Strength of lime–fly ash compacts using different curing techniques and gypsum additive

India focuses on attention towards ''greener and cleaner'' environment surrounding us. For that, the engineers and scientists have joined hands together to accept the challenges for recycling wastes from industries. The generation of Bottom Ash (BA) from thermal power plants which are being increased day by day and facing disposal and environmental problems. In spite of that, it is being used as landfills which has no commercial value, but now needs to think on its utilization as useable supplementary materials. But from the literature survey, it was found that a little amount of research have been carried out on BA in the area based on its adsorption capability of dyes; pelletization efficiency of cold bonded aggregate; compressive strength, durability, water absorption characteristics and density variation in concrete and mortar; in order to ensure its usage as adsorption as well as construction material. The present paper deals with a critical review on BA as an adsorbent, light weight aggregate as well as partial replacement of fine aggregate in concrete. In addition, physical and chemical properties, transportation and disposal mechanism and environmental effects are also discussed.

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“…A large no. of bodies has been worked on the effective utilization of FA [22][23][24][25][26][27][28][29][30][31].…”

Section: Initiative From Govt Of India For Ash Utilizationmentioning

confidence: 99%

Review on Current Research Status on Bottom Ash: An Indian Prospective

Mandal

Sinha

2014

J. Inst. Eng. India Ser. A

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“…Nevertheless, an excess of either component diminishes the effectiveness in boosting compressive strength. For optimal results, the proportion of these materials can be finely tuned 25 – 27 . Lin et al 28 established that a 1:2 ratio of quicklime to fly ash yields the most effective consolidation of soft soil.…”

Section: Test Materials and Methodsmentioning

confidence: 99%

Dynamic characteristics and reinforcement mechanism of silty soil improved by regenerated fiber polymer

Liu,

Zhao,

Liu

et al. 2023

Sci Rep

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The development of economical and efficient roadbed silt reinforcement technology not only guides the proficient utilization of silt resources but also fosters the green development of geotechnical engineering construction. Ensuring the robust dynamic stability of the roadbed is pivotal for the safe operation of vehicular traffic. In this context, employing recycled polyester fibers and inorganic curing agents, this paper leverages dynamic triaxial testing and scanning electron microscopy (SEM) methods to scrutinize the dynamic characteristics and microscopic mechanisms of recycled fiber polymer modified roadbed silt. The findings indicate that: (1) with a fiber content of 0.2%, the fiber-modified soil sample exhibits minimal damage, maximal dynamic strength and dynamic elastic modulus, and optimum resilience to dynamic loads; (2) akin to fiber-reinforced sand, an elevation in confining pressure can induce the creation of a quasi-cohesive force in fiber-reinforced soil, equivalently enhancing the confining pressure and thereby amplifying its strength; and (3) the surfaces of microparticles in the enhanced soil structure are enveloped with cementitious substances, while smaller soil particles coalesce to form aggregates that fill inter-particle pores, cultivating a denser and more stable improved soil structure and augmenting the dynamic characteristics of the improvement investment.

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“…It was found that the compressive strength of the blocks having fly ash increased by two-to three-fold compared to those without fly ash. The production and properties of compacted fly ash bricks and their masonry have been studied 12,13 . These studies recommended an optimum ratio of 35% fly ash and 65% sand for better strength and durability characteristics.…”

Section: Non-organic Solid Wastementioning

confidence: 99%

Non-Organic Solid Wastes - Potential Resource for Construction Materials

Reddy¹,

Kumar²,

Ullas³

et al. 2016

Current Science

Self Cite

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Construction industry consumes natural resources in bulk quantities for various products such as bricks/ blocks, mortar, concrete, etc. Indiscriminate exploitation of natural resources to meet the ever-expanding needs of the construction sector is posing serious environmental concerns and resulting in scarcity of natural raw materials. At the same time, a large volume of non-organic solid waste (NOSW) is being generated through various anthropogenic activities. It is challenging to find environmentally safe and economically viable solutions for handling such waste materials. This article discusses the construction industry scenario in India, some estimates of NOSW and strategies for their utilization. Few case studies of R&D work on the possibilities of utilizing NOSW for construction products are illustrated. In particular, the technical feasibility of utilizing construction and demolition (C&D) waste and iron ore tailings (IOT) as raw materials for construction products is highlighted. Experimental results presented here on the properties of mortar and concrete when C&D waste and IOT are used as an alternative to fine aggregate for replacing the scarce river sand are promising, showing immense potential for utilizing NOSW for the manufacture of construction products and materials.Keywords: Aggregates, construction materials, iron ore tailings, solid waste.CONSTRUCTION sector consumes maximum amount of natural resources and energy. Manufacturing of construction products requires raw materials and energy. Majority of the raw materials are mined from the earth. Natural resources are mined indiscriminately for construction purposes, causing environmental problems. Energy is expended for converting the raw materials into useful construction products. In addition, the construction materials and products are hauled over long distances spending fossil fuel energy. There are many instances where laws have been enforced to preserve precious natural resources and even ban mining of sand from the river beds.Raw material extraction, manufacture of materials, transportation and construction cause environmental damage and greenhouse gas (GHG) emissions. Estimates show that more than 40% of the total energy and 30% of the material resources are consumed by the habitat and related infrastructure 1 . Ruuska and Hakkinen 2 estimate that better construction and use of buildings in the European Union would influence 42% of energy consumption and more than 50% of all extracted materials. There is an urgent need for minimizing the mining of raw materials and reducing energy consumption.Annual per capita consumption of construction materials is estimated at 1.8 and 3.6 tonnes in India and the world respectively 3 . Aggregates constitute about 60% of the total materials consumed. For example, in India per capita annual consumption of aggregates is about 1.0 tonne in contrast to about 0.20 tonnes food grains consumption. Consumption of cement has grown by leaps and bounds since the last three decades. A tonne of cement requires 5-6 ton...

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Strength of lime–fly ash compacts using different curing techniques and gypsum additive

Cited by 52 publications

References 15 publications

Review on Current Research Status on Bottom Ash: An Indian Prospective

Review on Current Research Status on Bottom Ash: An Indian Prospective

Dynamic characteristics and reinforcement mechanism of silty soil improved by regenerated fiber polymer

Non-Organic Solid Wastes - Potential Resource for Construction Materials

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