Specific Surface Area of Construction Minerals
Authors
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College of Construction Engineering, Jilin University, Changchun 130 026 ,CN
Peng Tian -
College of Construction Engineering, Jilin University, Changchun 130 026 ,CNLei Nie
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College of Construction Engineering, Jilin University, Changchun 130 026 ,CNGaofeng Zhan
Keywords:
Specific Surface Area, Pore, Composition, Adsorption, Characteristic Model.Abstract
Pore characteristics are the key index to characterize the surface characteristics of mineral materials. The surface pore characteristics of road of construction minerals are the key indexes to influence the adhesion and pavement performance of asphalt mixture. Adsorption and desorption experiments on limestone, andesite and basalt. Using nitrogen as adsorbent in the experiment. Through the calculation, the specific surface area and pore size distribution of multiple groups of mineral materials were obtained. The results show that the pore characteristics of the mineral surface are closely related to the composition and genesis. The average pore size and specific surface area of limestone are much higher than basalt and andesite. The average pore diameter of limestone is 5.6 times than that of basalt and 8 times than that of andesite. The BET specific surface area is 4.5 times than that of basalt and 7.8 times than that of andesite. Limestone is a sedimentary rock, the surface is rougher than that of basalt and andesite. There is a great difference in the texture of limestone from different quarries. The average pore size of basalt and andesite is similar, and the surface pore characteristics of them even produced by different quarries are close.
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