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http://hdl.handle.net/123456789/1242
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| Title: | Impact of Sustainable Cements on the Conservation of Energy in Buildings |
| Authors: | Sood, V
Agarwal, S K
Kumar, Ashok |
| Keywords: | Fly ash
Super-plasticizer
GHG
Metakaolin |
| Issue Date: | 28-Dec-2012 |
| Abstract: | This article discusses the practicality of replacing Portland cements with alternative hydraulic cements popularly called sustainable cements made with 0.5 or even lower clinker factor. The use of high volume of fly ash & granulated blast furnace slag (GBFs) or both could result in lowering total CO2 emissions per unit volume of concrete of equivalent performance because most CO2 emissions result directly from the combustion of fossil fuels to produce usable forms of energy. Thus, almost any approach to decreasing fossil fuel consumption should have a similar beneficial effect in reducing CO2 emissions per unit of product. Currently, the cement industry is responding rapidly to the perceived societal need for reduced CO2 emissions by increasing the production of blended Portland cements using supplementary cementitious materials that are principally derived from industrial by-products, such as blast-furnace slag and coal combustion fly ashes. Replacement of clinker with additive materials like flyash / blast furnace slag etc. not only reduces the power consumption, protects the environment, conserve the limestone and coal but also reduces the amount of GHG emission to a great value. The work has been done at CBRI using admixtures like sodium sulfate and super-plasticizer on the compressive strength of cement paste incorporating fly ash and slag upto 70%. At 40% replacement of cement with fly ash (collected from first electro precipitator) using 1% super-plasticizer gives 5% less strength at 28 days but at 90 days it is at par with the control. However with 40% slag at 3, 7 & 28 day strength is at par and slightly more at 90 days when 2% sodium sulfate is added. With 50% replacement the trend is same as with 40% replacement except slightly lower strength upto 7days. With 30% each of fly ash and slag it has been found that 28 & 90 day strength is similar to 50% replacement level. At 70% replacement the strength is low even at 90 days compare to control. However at 360 days compressive strength of cement paste without admixture at 60, 50 and 40% fly ash or slag is at par with the control and with admixture it is more in all the cases. |
| Description: | National Conference Emerging trends of energy conservation in buildings Nov.01-03, 2012
CSIR-Central Building Research Institute Roorkee-247667, Uttrakhand, India. |
| URI: | http://hdl.handle.net/123456789/1242 |
| Appears in Collections: | Published Articles
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