نتایج جستجو برای: fine aggregate percentage air entraining admixture

تعداد نتایج: 487494  

Journal: :Construction And Material Journal 2022

One of the concrete technologies developed to obtain good compressive strength is additional material for iron lathe waste obtained from residue turning process. This study aims determine effect as a fine aggregate additive on concrete. The test was carried out based SNI standard 1974:2011. sample making specimens by varying 0%, 1.5% and 2.5% weight in mixture with 29.05 MPa. Concrete samples w...

Journal: :Circulation. Cardiovascular genetics 2015
Priya B Shetty Hua Tang Tao Feng Bamidele Tayo Alanna C Morrison Sharon L R Kardia Craig L Hanis Donna K Arnett Steven C Hunt Eric Boerwinkle Dabeeru C Rao Richard S Cooper Neil Risch Xiaofeng Zhu

BACKGROUND Admixture mapping of lipids was followed-up by family-based association analysis to identify variants for cardiovascular disease in African Americans. METHODS AND RESULTS The present study conducted admixture mapping analysis for total cholesterol, high-density lipoprotein cholesterol, low-density lipoprotein cholesterol, and triglycerides. The analysis was performed in 1905 unrela...

2008
P. Stroeven J. Hu M. Stroeven

The computer simulation study of Portland cement blending confirmed the major mechanism to be size segregation in the Interfacial Transition Zones around the aggregate particles. Fine particles tend to move through the skeleton of larger particles towards the surface of the aggregate grains, improving local density. But the most interesting feature is a disproportionately larger internal bond c...

Journal: :محیط شناسی 0
مسعود جمشیدی دانشگاه علم و صنعت ایران، گروه پلیمر، استادیار دانشکده مهندسی شیمی امیر جمشیدی دانشگاه تهران ، دانشکدة محیط زیست ، کارشناس ارشد مهندسی عمران محیط زیست ناصر مهردادی دانشکاه تهران، دانشکدة محیط زیست ، دانشیار گروه مهندسی عمران محیط زیست

the present work has been performed to eliminate sewage dry sludge of alborze city wastewater treatment plant by using them as fine aggregate in concrete. on this basis, at first the selected dry sludge was analyzed for xrd and xrf for crystalline phases and chemical composition, respectively. the results showed that more than 50% of the sludge is formed of sio2 and it had more than 20% organic...

2017
S. Nambirajan

Fiber reinforced concrete is a composite material consisting of mixtures of cement, fine aggregate, coarse aggregate and fibers. The fiber reinforced concrete exhibits better fatigue strength and increased static and dynamic tensile strength and compressive strength. In this project, the strength of fiber reinforced concrete was investigated partial replacement of cement with rice husk ash and ...

2015
Himanshu Upadhyay

Despite its few inherent shortcomings, concrete has proved to be the most widely used construction material, no substitute in time still to come. In the present investigation, study of admixture of concrete was carried out. The strength of concrete depends on its mix proportions. We used so many admixture e.g. ‘silica. Fumes, fly ash etc , when we used these type of admixture the result was ver...

Journal: :Ground water 2008
Caleb M Conrad Robert W Ritzi David F Dominic

We considered small-scale measurement of permeability in pebbly sands having coarser grains supported in a finer grained matrix (fine packing). Our central question was whether air-based measurements are representative if made with a permeameter tip seal pressed in the sand matrix. We created pebbly sands and variably sorted sands, with systematic variation in aspects of their fine packing. We ...

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