دانلود رایگان مقاله لاتین آنالیز خاک رس از سایت الزویر
عنوان فارسی مقاله:
تجزیه و تحلیل خاک رس و پوسته پالم کرنل به عنوان یک ماده سیمانی در غنا
عنوان انگلیسی مقاله:
Analysis of co-fired clay and palm kernel shells as a cementitious material in Ghana
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
The construction industry of today has well embraced the use of supplementary cementitious materials (SCMs) either in blended cement formation or added separately to concrete mix as a mineral admixture [12]. Using SCMs in concrete formulation is widely known to improve cement based products performance through the filler and pozzolanic effect. The filler effect leads to the generation of portlandite (CH) at the early hydration of cement whereas pozzolanic effect is the reaction that occurs between portlandite generated from cement and the silicate and aluminate phases in SCMs leading to the formation of secondary products such as calcium silicate, calcium aluminate and calcium aluminosilicate hydrates thatenhance strength properties. Malhotra and Mehta [13] have reported that SCMs utilization provides a sustainable way of disposing waste-byproducts via concrete applications. The application of SCMs in concrete could replace between 20 and 30% of Portland cement and this leads to a significant reduction of harmful anthropogenic gases such as carbon dioxide, NOx and SO3 produced from the production of cement [14]. It is stated in the work of Yang [15] that one most practical means of producing economical concrete is through the use of SCMs. The most widely used SCMs are industrial by-products which include slag from pig iron production, fly ash from coal combustion plants, and silica fume form ferrous producing plants [12]. Metakaolin produced from high purity kaolin clays at temperatures from 600 to 900 C are recently introduced SCMs into the world of concrete formation [8,10].
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کلمات کلیدی:
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