توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱COMPERING THE EFECT OF USING THE COPPER BLAST FURNACE SLAG AND TAFTAN POZZOLAN ON CONCRETE PROPERTIES
نویسنده(ها): ،
اطلاعات انتشار: سومین کنفرانس بین المللی بتن و توسعه، سال
تعداد صفحات: ۸
Today large number of researches are carried out on concrete properties due to it's widely use as an important construction material. The most part of concrete is cement which its cost decrease leads to producing of economical concrete. Using the industrial sweepings such as copper blast furnace slag which have pozzolan properties can make the cement economical. By using these materials not only production costs of cement will be reduced but also saving costs of sweepings will be eliminated and natural environment will be protected. In this research copper blast furnace slag milled to mesh325 which in this mesh maximum diameter of grains are 45 micron. 455 cubic specimens with size of 15×15×15 and cylindrical specimens with size of 30×15 have been made. Compressive and tensile experiments carried out and the results showed the positive effect of Taftan pozzolan and copper slag on concrete properties.<\div>

۲COMPARING THE EFFECT OF USING THE COPPER BLAST FURNACE SLAG AND TAFTAN POZZOLAN ON CONCRETE PROPERTIES TO THE AGE OF 6 MONTHS
نویسنده(ها): ،
اطلاعات انتشار: نخستین کنفرانس بین المللی تکنولوژی بتن، سال
تعداد صفحات: ۱۲
Today large number of researches are carried out on concrete properties due to its wide use as an important construction material. Most part of concrete is cement whose cost decrease leads to producing of economical concrete. Using the industrial sweepings such as copper blast furnace slag which have pozzolan properties can make the cement economical. By using these materials, not only will the production costs of cement be reduced but also saving costs of sweepings will be eliminated and natural environment will be protected. In this research, the copper blast furnace slag milled to mesh325 and in this mesh the maximum diameter of grains is 45 micron. 455 cubic specimens with a size of 15×15×15 and cylindrical specimens with a size of 30×15 have been made. Compressive and tensile experiments were carried out and the results showed the positive effect of Taftan pozzolan and copper slag on concrete properties.<\div>

۳Investigation of Nano–SiO2 Effects on High–Volume Fly Ash Concrete
اطلاعات انتشار: نخستین کنفرانس بین المللی تکنولوژی بتن، سال
تعداد صفحات: ۹
In this paper, laboratory studies have been done on the mechanical properties and microstructure of high–volume fly ash concrete incorporating nano–SiO2. The results were compared with those of ordinary Portland cement (OPC) and of high–volume fly ash concrete (HFC). In this study, in order to determine effects of nano–SiO2 additives on properties of y ash mortar, 1%, 2% and 4% of nano–SiO2 was added to the mixes as a replacement of cement to investigate their physical properties and micro–structures. In all mixtures, water–binding ratios of 0.5 and 0.6 have been used. Also in all mixtures except OPC samples, constant substitution amount of 40% of y ash was proposed. Assessments of these concrete mixes were based on short–term and long–term performance. Compressive strength tests on specimens cured at 3, 7, 28, 56, 90 and 120 days, tensile strength tests on specimens cured at 7 and 28 days and finally SEM test on selected specimens cured at 7 and 120 days were carried out. Results indicated that because of low pozzolanic reaction of fly ash, early strength of HFC decreased considerably. Besides, nano–SiO2 in addition to its effects as a ller, because of considerable increase of surface–to–volume, promoted pozzolanic reaction. So, it results in developing the strength of HFC especially in early ages. Also, by increase of curing age of concrete because of activation of fly ash and decrease of Ca(OH)2 due to hydration, strength was developed relative to OPC sample.<\div>

۴Investigation of Strengthening of Reinforced Concrete Members with FRP Composites in Lab
نویسنده(ها): ، ،
اطلاعات انتشار: دومین کنفرانس بین المللی کامپوزیت، سال
تعداد صفحات: ۶
In this paper an experimental investigation has been done to improve the load bearing capacity of reinforced concrete members which were strengthened by various composite fibers (E–GFRP). eleven square reinforced slabs (550mm×550mm) with different thicknesses (45 and 55 mm) and nine square specimen which had 1400mm length and 1200mm net spans (150mm×150mm cross section) have been constructed for tests. All the slabs were designed for investigation of punching shear failures and The E–GFRP composites were in tension side and also it was placed on some of specimens in holes vertically. Slabs on all four sides were simply on supports and was loaded through a column (50mm×50mm) that was in the center of every slab. All the beams were designed to investigate the shear failure and E–GFRP composites were placed in tension sides and edges of specimens. The beams were placed on simple supports and was loaded by tow point loads that were in 1\3 distance from each other. The results showed that using E–GFRP composites the reinforced concrete members loading capacity was significantly increased.<\div>

۵Implementation of ANFIS in ACO to optimize cost and strength of crumb rubber concrete
نویسنده(ها): ، ،
اطلاعات انتشار: دهمین کنگره بین المللی مهندسی عمران، سال
تعداد صفحات: ۱۲
The aim of this study is to find the lowest cost concrete mixture subject to a specified compressive strength and finding the highest strength mixture. Some mix designs of crumb rubber concrete containing silica fume were gathered from literature and less than half of them were trained an Adaptive Network–based Fuzzy Inference system. Ant Colony System algorithm was applied as optimizer using ANFIS as compressive strength evaluator. Other design data verifies the results of ANFIS and ACS and approves their great capability in modeling and optimizing of CRC concrete mixture, respectively.<\div>
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