نتایج جستجو برای: natural pozzolans
تعداد نتایج: 481753 فیلتر نتایج به سال:
it is not possible to understand developments of a country’s culture and civilization without knowing his believes and myths. whether it is north or south, east or west, planes or mountains, sahara or deserts, here in iran every corner includes valuable and precious treasures which are known all over the world, and cultural – historical objects which are found here adorn all well known museums...
Following the growing economic and industrial development, concrete is to find a special place as building materials, as optimization of materials and components of this structural material in order to increase its durability and long service life, significant economic and industrial benefits will follow. So Performance of Durability control tests , during and after the concrete construction, A...
abstract: the present study is an attempt to find out cultural exophoric references in iranian high-school elt textbooks and touch stone series to compare the frequency of occurrence of such references in these books. the purpose is to find out which of the series of the books under investigation impose a greater referential burden on efl learners as far as their reading comprehension of the ...
This work presents the results of study physical, chemical, mineralogical and pozzolanic properties altered volcanic tuffs (AVT) that lie in Los Frailes caldera, south Iberian Peninsula, demonstrates their qualities as pozzolans for manufacturing mortars cements high mechanical strength. The main objective this research is to show what extent AVTs can replace portland cement (PC) mortars, with ...
Abstract Low cost and high durability have made Portland cement the most widely‐used building material, but benefits are offset by environmental harm of production contributing 8–10% total anthropogenic CO 2 gas emissions. High sulfur‐content materials (HSMs) an alternative that can perform binding roles as cements with a smaller carbon footprint, possibly superior chemical, physical, mechanica...
Abstract The increasing concerns regarding global warming and the scarcity of raw materials in construction industry have led to a growing need for alternative low-carbon binders partially replace ordinary Portland cement. To assess suitability pozzolans as supplementary cementitious (SCMs), R 3 -test has been introduced successfully validated wide range materials. This test provides an opportu...
Cement is the most utilised construction material and second consumed commodity in world after water. It has been reported that heavily energy-intensive processes are involved its production account for about 7 to 10 % of total global anthropogenic carbon dioxide (CO2), which main cause climate change; also expensive economically. Energy cost efficiency can however be achieved by reducing on am...
The island of Milos is an active mining site since the Antiquity. Exploitation began with extraction obsidian lumps and volcanic lavas tuffs specific type, that were used as millstones, sulphur alum (alunite). Currently, activity focused on perlite bentonite, even though some years ago, kaolin, silica, pozzolans barite also exploited. bentonite rather a specialty not commodity, it has multifunc...
in this paper, a model based on gmdh type neural network, is used to predict gas price in the spot market while using oil spot market price, gas spot market price, gas future market price, oil future market price and average temperature of the weather. the results suggest that gmdh neural network model, according to the root mean squared error (rmse) and direction statistics (dstat) statistics ...
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