تم تحضير خمس خلطات إسمنتية عادية مكونة من حصويات دولوميتية تختلف فقط في نسبة الماء إلى الإسمنت w/c وفق السلسلة (0.35, 0.40, 0.45, 0.45, 0.50, 0.6).
بحيث حضرت ستة و ثلاثون مكعباً من العينات من أجل كل خلطة إسمنتية ذات نسبة w/c معينة.
Five mixtures of ordinary concrete of dolomite aggregates were
prepared by changing the water to cement ratio. Thirty six cubic
concrete samples were prepared for every mixture.
References used
Della. M. Roy. Relationship between permeability, porosity, diffusion and microstructure of cement pastes, mortar and concrete at different temperatures, materials. Research Laboratory. Pennsylvania, 1993
Kevern, J., Wang, K., Suleiman, M.T. and Schaefer, V.(2005). Mix Design Development for Pervious Concrete in Cold Weather Climates, Proceedings of 2005 Mid-Continent Transportation Research Symposium, Ames, Iowa
Yang, J. and Jiang, G.(2003). Experimental study on properties of pervious concrete pavement materials, Cement and Concrete Research, 33, 381-386
يعتبر القطن ( Gossypium s. p. p. ) من أهم المحاصيل الاستراتيجية في سورية حيث يعمل أكثر من مليوني شخص في زراعة وصناعة وتجارة محصول القطن .
Compacting hot mixes asphalt (HMA) at low temperatures or mixing it in the asphalt at high temperatures is a constant source of concern to researchers, as compacting and mixing at non-ideal temperatures leads to adverse results, which negatively affect the properties of asphalt concrete and lead to problems paving.
This research aims to inspect the defects and discontinuities in steel billet by
ultrasonic detector. Straight beam probe used to detect a lot number of imported steel
billets that clearly have internal defects.
The results showed the possibility
The study was conducted during 2017 in the laboratories of the department of Botany
at Tishreen University, Lattakia, Syria. The effect of ultraviolet radiation (UV-C and UVB)
for different periods (0.5, 1, 3, 5, 15, 15, 30, 45, 60 minutes) on the
It is very important to the design and development of
natural isolating materials Which are used in the cover-up of solid waste landfill, clay soils or mixtures of these soils and some
additions used as an impermeable liner for construction of soli