Papers by Keyword: Unit Weight

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Authors: Hanan A. El Nouhy
Abstract: This research investigates the influence of high temperature on the properties of bricks containing non-ground granulated blast-furnace slag (GBFS) as fine aggregate replacement. Replacement percentages were 0%, 25% and 50% by dry weight of fine aggregates. The manufactured bricks were exposed to 200°С, 400°С, 600°С, and 800°С for a constant duration of two hours after 28 days of curing. Tests were conducted according to both Egyptian Standard Specifications (ESS) and American Society for Testing and Materials (ASTM) in order to determine compressive strength, absorption percentage, oven-dry weight, and ultrasound pulse velocity. Also, loss in weight was performed. Compressive strength limit regarding load-bearing units was met by mix 1 at all tested temperatures. Mixes 2 and 3, resulted in compressive strength that satisfied the requirement for load-bearing units at temperatures ranging from room temperature to 600°С.Compressive strength obtained regarding mixes 2 and 3 met the requirements of non-load bearing units at 800°С. The control mix resulted in normal weight bricks when tested at the various temperatures till 600°С. At 800°С, mixes 2 and 3 yielded light weight and medium weight bricks, respectively. There was a significant reduction in mass when comparing the mass at 800°С with the corresponding mass at room temperature concerning the three mixes. Results showed that it is feasible to partially replace fine aggregate with GBFS even when bricks are subjected to elevated temperature.
Authors: Xiao Liang Wang, Guang Fan Li, Wan Jun Hao
Abstract: In this paper, the effects of multiple aquifers on the calculation of bearing capacity of foundation are represented. One side is how to ascertain the maximal influence depth of underground water, and the other is which to take from the unit weight of soil in the condition of multiple aquifers.
Authors: Xiao Yan Ding, Yong Lei Luo, Zhong Fan Chen, Ming Xu
Abstract: This paper designed the self-insulation concrete block meeting the energy-saving standard in northeast severe cold zones and introduced the whole design process of this new self-insulation concrete block. The size of the block is 390mm*280mm*190mm. We designed 15 types of block altogether, used ANSYS finite element software to analyze the combined influence of thermal engineering, mechanics and unit weight, got the best block type Q3 and optimized it twice in mechanical property and thermal performance, made the load-carrying capacity of the self-insulation concrete block tend to be more reasonable, and improved the thermal performance at the same time.
Authors: Yong He Deng
Abstract: When quantity of superfluous survey equals to zero,and sum of residuals squared with weight equals to zero,variance estimation of unit weight is found that it doesnt only equal to zero,but also equals to any plus real number.Then,a sort of imitative example was put forward to support the new conclusion.So,this paper has perfected variance estimation of unit weight based on theory and application in some aspect, and,has solved that,when quantity of superfluous survey equals to zero,we can still assess accuracy based on number.
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