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IMPROVEMENT OF CONCRETE DURABILITY BY COMPLEX MINERAL SUPER-FINE POWDER - kondetianupama - 08-16-2017 IMPROVEMENT OF CONCRETE DURABILITY BY COMPLEX MINERAL SUPER-FINE POWDER [attachment=17421] Introduction Coal gangue is a rock included in the coal bed and a waste discharged during coal mining and transportation as well as the most industrial waste discharged in China. It is estimated [1, 2], that the amount of gangue calculated as 15% of the coal output, there would be 100 million ton increment annually. Most of the coal gangue is a clay rock; its main mineral composition consists of clay mineral, followed by primary mineral quartz, feldspar, mica and pyrite, carbonate. After calcination under high temperature of 700-900 , the clay mineral is dewatered and disintegrated, the carbon Raw materials 2.1.1 Cement In the tests the PO425 cement manufactured by Chongqing Tenghui Diwei Cement Plant was applied with specific surface 3300 cm2/g. 2.1.2 Coal gangue The coal gangue is from the Huaying Mountain mine and treated by calcinations and grinding; 2.1.4 Fly ash The fly ash is a dry one from the Chongqing Jiulongpo Electric Power Plant; its properties conform to the Chinese Standard GB1596-91, Fly ash for cement and concrete, as standard class II. 2.1.5 Fine aggregate Medium size sand from Sichuan Jianyang with a modulus of fineness Mx = 2.32; normal grading with the silt content 0.8%. 2.1.6 Coarse aggregate Crushed limestone is from Xiaoquan, Chongqing City with a size of 5-20 mm and normal continuous grading. The content of flaky and elongated particles is <3% and the crushing index 6%. 2.1.7 Admixture A complex retarding super-plasticizer FDN with slight air entraining, water reduction rate 23% and other properties conforming to the requirements for first class one in Chinese standard Admixtures for concrete (GB8076-2000), the dosage of the admixture is 1.2%. |