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عنوان فارسی مقاله:
خصلت سیمان ترکیبی قبل از صنعتی و اثر دمای پیش پخت
عنوان انگلیسی مقاله:
Characterisation of pre-industrial hybrid cement and effect of pre-curing temperature
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Since Portland cement (OPC) was patented in the nineteenth century, its use has spread worldwide, making it one of humanity's most prevalent structural materials. That predominance is attributable to its low cost, high mechanical strength and universal availability [1,2]. Today, however, the cement industry is faced with higher production costs due to: i) rising energy prices the worldwide, which are mirrored nearly linearly in cement costs; ii) shortage of supply of quality raw materials; and iii) the need to reduce CO2 emissions (OPC manufacture generates nearly two billion tonnes/year of CO2 emissions, accounting for 8e10% of anthropogenic emissions worldwide [3]). As a result, both the scientific and technical communities are working to develop alternative cements and binders [1,4e6]. One effective way of lowering the CO2 emissions associated with OPC manufacture is to use the so-called alkaline cements or geopolymers [4e7] developed in recent decades. Any contention that alkaline cements can replace OPC in all of its many applications at this time is hardly realistic, however. One possible intermediate solution (with scant technical, logistic or economic implications) might consist in reducing the clinker content in cement as far as possible and expanding the use of supplementary cementitious materials (SCMs) such as natural pozzolans or industrial byproducts (fly ash or slag) [8e11]. The problem posed by using large amounts of SCMs, however, is that they lengthen setting times and lower the initial mechanical strength of mortars and concretes. As in alkaline cement production, solid or liquid activators (new admixtures developed for this purpose) can be used to circumvent that problem. The combination of traditional OPC and alkaline cements yields what are known as hybrid cements (HYC) [5,12,13]. Hybrid cements are the result of alkali-activating low (20e30%) clinker content blended cements with an alkaline activator added in a proportion of approximately 5%. The remaining 65e75% of the blend consists of supplementary cementitious materials (SCMs), either natural pozzolans or industrial by-products such as fly ash from coal-fired power plants or blast furnace slag. In Europe, the amount of supplementary materials (SCMs) that can be used as additions in Portland cement is limited by the existing legislation (EN 197-1). Elsewhere, however, such as in the USA (ASTM standard C1157/C1157M-11) and certain Latin American countries (as Colombia, NTC 121), neither the chemical composition of cements nor of their components are restricted. As the standards in place there classify cements on the grounds of prescriptive and performance requirements, hybrid cements meeting those requirements could be commercialised immediately in such countries.
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کلمات کلیدی:
PDF]Characterisation of pre-industrial hybrid cement and effect of pre ... iranarze.ir/wp-content/uploads/2016/11/E2901.pdf Jul 30, 2016 - The effect of the initial curing temperature (25 ± 1 or 85 C for 20 h) on .... hybrid cement; ii) and on the other, to determine whether pre-curing. Characterisation of pre-industrial hybrid cement and effect ... - DeepDyve https://www.deepdyve.com/.../characterisation-of-pre-industrial-hybrid-cement-and-effe... Read "Characterisation of pre-industrial hybrid cement and effect of pre-curing temperature" on DeepDyve - Instant access to the journals you need! Characterisation of pre-industrial hybrid cement and effect of ... - ISI-dl isi-dl.com/item/141022 ... worldscientific.com. SEARCH. Characterisation of pre-industrial hybrid cement and effect of pre-curing temperature. sciencedirect.com. Source Link ... Ultra High Performance Concrete (UHPC): Proceedings of the Second ... https://books.google.com/books?isbn=3899583760 Ekkehard Fehling, Michael Schmidt, S. Stürwald - 2008 - High strength concrete ... towards the application of hybrid and multifunctional materials and structural parts. ... Heat treatment of concrete has a long standing tradition in the pre-cast concrete industry and is mainly used in order to reduce curing time and ... up to 400 °C. Usual effects of heat treatment consists in the development of a more dense ... Effect of temperature on cement - 首页 en.nankai.findplus.cn/?...%22Effect%20of%20temperature%20on%... - Translate this page The Effect of Curing Temperature on the Properties of Cement Pastes ... Characterisation of pre-industrial hybrid cement and effect of pre-curing temperature. Variation in the Composition of C‐S‐H Gel in Portland Cement Pastes ... onlinelibrary.wiley.com/doi/10.1111/j.1151-2916.1999.tb02230.x/full by JI Escalante‐Garcia - 1999 - Cited by 43 - Related articles Variation in the composition of C-S-H gel, the main hydration product of portland cement, cured at various temperatures, was studied using scanning electron ... Cement & concrete composites - Helsingin yliopisto https://www.terkko.helsinki.fi/feednavigator/index.php?j...Cement...concrete... Time dependent behaviour of fibre pull-out in self-compacting concrete · Cement .... Characterisation of pre-industrial hybrid cement and effect of pre-curing ... [PDF]On High-Strength Low-Shrinkage Iots-Based Concrete - IIETA iieta.org/sites/default/files/Journals/IJHT/34.4_18.pdf 2Beijing Key Laboratory on Resource-oriented Treatment of Industrial Pollutants, Beijing 100083,. China .... GFGD and cement clinker, which has been pre-crushed to smaller than ...... hybrid cement and effect of pre-curing temperature,”.
