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Baidya R.,Jadavpur University | Ghosh S.K.,Jadavpur University | Parlikar U.V.,ACC Ltd
Environmental Technology (United Kingdom) | Year: 2017

Co-processing in cement kiln achieves effective utilization of the material and energy value present in the wastes, thereby conserving the natural resources by reducing the use of virgin material. In India, a number of multifolded initiatives have been taken that take into account the potential and volume of waste generation. This paper studies the factors which might influence the sustainability of co-processing of waste in cement kilns as a business model, considering the issues and challenges in the supply chain framework in India in view of the four canonical pillars of sustainability. A pilot study on co-processing was carried out in one of the cement plant in India to evaluate the environmental performance, economical performance, operational performance and social performance. The findings will help India and other developing countries to introduce effective supply chain management for co-processing while addressing the issues and challenges during co-processing of different waste streams in the cement kilns. © 2017 Informa UK Limited, trading as Taylor & Francis Group

Karandikar M.V.,ACC Ltd | Khadilkar S.A.,ACC Ltd and Head
Indian Concrete Journal | Year: 2014

The paper attempts to review the different types of the available natural biopolymers and the effects of these additions on the fresh and hardened properties of modern day Portland cement mortar and concrete. The paper further discusses the experimental data generated at the author's laboratory as a part of exploratory work carried out, on use of natural polymers and its impact on the properties of cements, mortars and concretes in terms of increased early strengths, air entraining effect, better adhesiveness, anti microbiological agent, improvement in plasticity and workability of the mortars and concrete, comparing the results of the natural biopolymeric additions with the commercially available additives/ admixtures used to induce similar properties in mortar and concrete. The paper concludes that the observed effects of use of these biopolymeric additions on the properties of Portland cement mortar and concrete would inspire more researchers to work in these areas and evolve natural admixtures, which would further add sustainability to the modern day concrete constructions.

Karstensen K.H.,Sintef | Parlikar U.V.,ACC Ltd | Ahuja D.,ACC Ltd | Sharma S.,ACC Ltd | And 7 more authors.
Environmental Science and Policy | Year: 2014

The Montreal Protocol aims to protect the stratospheric ozone layer by phasing out production of substances that contribute to ozone depletion, currently covering over 200 individual substances. As most of these compounds are synthetic greenhouse gases, there is an opportunity to curb both ozone depletion and climate change simultaneously by requiring Parties of both the Montreal and the Kyoto Protocol to destroy their existing stocks of concentrated chlorofluorocarbons (CFCs). Many emerging countries still possess stocks which need to be destroyed in an environmentally sound manner but costs may be prohibitive.The UNEP Technology and Economic Assessment Panel identified in 2002 eleven destruction technologies which meet the criteria for environmentally sound destruction of chlorofluorocarbons. Cement kilns were among these, but no study has been reported in scientific literature assessing its destruction performance under real developing country conditions up to now. In contrast to incinerators and other treatment techniques, high temperature cement kilns are already in place in virtually every country and can, if found technical feasible, be retrofitted and adapted cost-efficiently to destroy chemicals like CFCs. India has the second largest cement industry in the world and several hazardous waste categories have been tested successfully in recent years.The objective of this study was to carry out the first full scale demonstration involving high feeding rates of concentrated CFC-gases in a local cement kiln and to assess its feasibility and destruction performance. The test in Madhya Pradesh demonstrated that the kiln was able to destroy several concentrated CFC-gases effectively in an irreversible and environmental sound manner without causing increased releases of HCl, HF or PCDD/PCDF. The destruction and removal efficiency was >99.9999% and the overall environmental performance in compliance with Indian regulation and international best practice.The test also revealed that cement kilns have a much higher disposal capacity than previously anticipated and that such undertaking can contribute significantly to reduce the release of both ODS and greenhouse gases; the destruction of 16.3tonnes of CFCs done in this demonstration is equivalent to saving the release of 131,265tonnes of CO2 to the atmosphere. © 2014 Elsevier Ltd.

Najar P.A.M.,Jawaharlal Nehru Aluminum Research Development and Design Center | Gondane S.R.,Jawaharlal Nehru Aluminum Research Development and Design Center | Jeurkar J.U.,ACC Ltd | Nimje M.T.,Jawaharlal Nehru Aluminum Research Development and Design Center
Separation Science and Technology (Philadelphia) | Year: 2013

Silica gel H impregnated with microcrystalline cellulose gel in alkaline medium was used as a stationary phase for the thin layer chromatography of heavy metal cations. A mixture of 10% aqueous potassium thiocyanate and triton X-100 in 1:1 v/v has been identified as the best combination of mobile phase for achieving selective separation of cobalt from nickel. The efficacy of the chromatographic system has been investigated by monitoring reproducibility of RF values and spot compactness with respect to the change in sample concentration and matrix effect. The improved selectivity of impregnated silica gel H was expounded by SEM and FTIR studies. The typical surface modification as well as the chemical changes in impregnated silica gel H was attributed. Chromatograms of the cations were quantitatively evaluated by scanning densitometry in comparison with ICP elemental analysis. The proposed method is applied for the determination of cobalt and nickel cations in spiked samples of geological and industrial origin. © 2013 Copyright Taylor and Francis Group, LLC.

Dhuri S.S.,ACC Ltd
Indian Concrete Journal | Year: 2012

Manufactured sand is a purpose-made crushed fine aggregate produced from a suitable source material. Its production requires specially designed crushing equipment, screening and possibly washing. Like any other component of concrete, manufactured sand must conform to the specification that is suited to the performance required of the concrete. Blending is effective in reducing the level of microfines in the fine aggregate used in the concrete mix compared with the microfines in the manufactured sand. Despite the improvements made in the manufacturing process, complete use of manufactured sand has the risk of concrete segregation in high workability mixes. This problem can be taken care of by using mineral admixtures such as fly ash and designing mixes appropriately. It has now been made possible to produce high strength pumpable concrete mixes replacing natural sand completely.

Dhuri S.S.,ACC Ltd. | Surve P.D.,ACC Ltd.
Indian Concrete Journal | Year: 2010

The fourth oil berth (J4) of Mumbai Port Trust (MbPT) located near Jawahar Dweep carried out first engineering tests of all the structures to assess the extent of damage. M/s e-cube Consultants, Thane, engaged for the assessment work with field engineering tests and laboratory tests, came up with the results that were applied to decide and adopt suitable repair systems for restoration of the whole structure. The investigations included visual inspection, analysis of the soundness of structural elements between two pile bends, core test, ultrasonic Pulse Velocity test (UPV), half-cell potential measurement, Schmidt Rebound Hammer test, and photographic documentation. The tests results showed that the damage to the structure is extensive and the cause was chloride penetration resulting in corrosion of the reinforcement and spalling of concrete. The suggestions for repair and rehabilitation of the structural elements include removing damaged concrete and steel, followed by sand blasting.

With the growing population and the changes in the life style of the society, the demand of the cement product is increasing rapidly. The present global demand is > 2.5 Bio TPA. Based on a study carried out by IEA, the cement demand is expected to reach > 5 Bio TPA by 2050. Cement manufacture is a highly resource intensive activity and it consumes large quantum of mined resources as raw materials and fuels. These natural resources are slowly getting scarce posing a challenge for the cement industry. Further, existing technology of cement manufacture releases large amount of CO2 which has been identified as the most important reason for global warming. Hence, the challenge before cement industry is to produce required quantum of cement with reduced quantities of resources and with reduced CO2 emissions. This aspect is mandating cement industry to explore and implement innovative technologies and approaches in the manufacture of cement. Several new dimensions are getting evolved already and several options are under active exploration by the scientist globally. These include carbon capture and sequestration, clinker substitution, using raw material sources other than limestone, use of alternative fuels and raw materials, fuel switching and improving energy efficiency etc. This paper captures some of the developments related to the technological advances that are being explored and implemented so as to be able to produce cement in an ecologically sustainable manner, conserve our natural resources, reduce the GHG emissions and also use them effectively as a input resource to mitigate the climate change impact, and help improve the condition of our environment to the desired levels.

Shandilya A.,ACC Ltd
26th International Mineral Processing Congress, IMPC 2012: Innovative Processing for Sustainable Growth - Conference Proceedings | Year: 2012

ACC ECOSAND is finely powdered crystalline silica, which can replace natural sand usage in concrete and plasters. ACC ECOSAND ensures a comparatively denser concrete than those made only with natural sand and / or quarry fines / Manufactured Sand (Artificial Sand). Moreover, there is a significant gain in compressive strength (10-15 %) & durability in concretes (Reduced chloride conductivity leads to increased durability). ECOSAND is a by-product of froth flotation of limestone. At ACC Madukkarai cement works, Coimbatore, Tamilnadu, full-fledged mineral beneficiation process is adopted to enhance the usage of flotation reject in concrete and plasters. Optimum level for usage of ECO-SAND is 50%. With 50% usage of natural sand+50% ECO-SAND in concrete mix, 1 day, 3 day, 7 day & 28 day compressive strength is increased by 30.1 %, 22.6 %, 15.1 % & 11.0 % respectively and with moderate chloride permeability as compare to 100% Natural Sand.

Shandilya A.,ACC Ltd | Jha L.M.,ACC Ltd
26th International Mineral Processing Congress, IMPC 2012: Innovative Processing for Sustainable Growth - Conference Proceedings | Year: 2012

Froth flotation is a selective separation process and rarely used for beneficiation of limestone in the world as compared to other minerals and also mostly known conventional methods of up gradation of ROM including wobbling, selective mining, sorting, preblending etc. Limestone is mainly used in the manufacture of cement, steel and chemical industries. High grade limestone deposits are depleting day by day and the requirement of the industries have to be met by beneficiating the low grade limestone deposits in the world. And because of marginal quality of limestone, it cannot be directly used in cement industry. At ACC Madukkarai cement works, Coimbatore, Tamilnadu, full fledged mineral beneficiation process is adopted to enhance the quality of low grade lime stone from 38-42 % CaO to 45-47 % CaO and silica reduced from 19-22 % to 11-13 % by use of oleic acid (commercial grade and vegetable origin) 0.38 kg/ton of limestone and caustic soda 0.05 kg/ton of limestone.

Acc Inc. | Date: 2015-01-23

Suspension systems for automobiles; Automobiles and their parts and fittings; Shock absorbers for automobiles; Shock absorbers for land vehicles; Springs for land vehicles; Mechanical elements for land vehicles, namely, axles, drive shafts, spindles, axle bearings, shaft couplings, and land vehicle transmissions and replacement parts thereof; and Two-wheeled motor vehicles, bicycles and their parts and fittings.

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