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Wang L.,China Institute of Water Resources and Hydropower Research | Wang L.,Guangdong Key Research Base of Water Resources | Zhan Z.,Guangzhou University | Liu J.,China Institute of Water Resources and Hydropower Research | Liu J.,Guangdong Key Research Base of Water Resources
Shuili Fadian Xuebao/Journal of Hydroelectric Engineering | Year: 2014

Three types of manufactured sand were produced with different mineral compositions of limestone, granite and sandstone, and their shape features were compared and examined using the DIP method. The results indicate that, of the three types, limestone sand has the largest lengthwise ratio and smallest sphericity with its flatness ratio and particle shape factor in the medium range; granite sand has a medium lengthwise ratio and sphericity and the smallest flatness ratio and particle shape factor; sandstone sand has the smallest lengthwise ratio and largest flatness, particle shape factor and sphericity. Overall, limestone sand is long and narrow, granite sand is flat, sandstone sand is perfectly round. Copyright. Source


Wang L.,China Institute of Water Resources and Hydropower Research | Wang L.,Guangdong Key Research Base of Water Resources | Liu J.,China Institute of Water Resources and Hydropower Research | Liu J.,Guangdong Key Research Base of Water Resources | Zhong H.,Guangdong Key Research Base of Water Resources
Shuili Fadian Xuebao/Journal of Hydroelectric Engineering | Year: 2014

The influences of rock types and rock powder contents of manufactured sand on the properties of concrete are examined in this study. With a fixed content of rock powder, the effect of rock types is little on the slumps of concrete, but significant on the air content and compressive strength. Granite manufactured sand concrete has the greatest air content, 1.4% greater than that of limestone on an average. The air content of sandstone concrete ranks the second, only 0.5% greater than that of limestone concrete on an average. The compressive strength of these manufactured sand concretes takes an order of limestone > sandstone > granite. The strengths of sandstone concrete at 7d and 28d ages are 0.96 and 0.84 times of those of limestone concrete, and the granite concrete 0.88 and 0.80 times, respectively. For all the three concretes, an increase in rock powder content causes linear decrease in air content and slump, and linear increase in compressive strength. In the condition of 10% increase in rock powder content, air content is decreased by 2.5%, slump decreased by 5.5cm, and strength increased by 15.8%. Copyright. Source

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