Effect of aggregate shape on asphalt materials properties.

Dalam industri pembinaan jalan raya yang semakin pesat membangun, permintaan ke atas agregat sebagai bahan binaan semakin meningkat. Sifat agregat memberi kesan yang signifikan ke atas ciri-ciri konkrit asfalt memandangkan hampir 90% campuran asfalt terdiri daripada agregat. Demand for aggregates as construction material increased due to the continuous development of the road building industry. Since aggregates made up of more than 90% of an asphalt mixture, aggregate properties significantly influence mix performance

Changes in the structure of talc by continuous jet milling in relation to imposed specific kinetic energy

Ultra fine talc is used in many industries such as paper, paints, polymers, cosmetics and pharmaceutical. Emerging demand with stringent specification from these industries has marked jet mill as one of the essential grinding mill to produce ultra fine talc. Ultra fine grinding testwork of talc was carried out in opposed fluidized bed jet mill by varying the feed rate, classifier rotational speed and grinding pressure at three levels. In this jet mill, grinding and classification took place simultaneously. The ground products were characterized in terms of particle size distribution and mechanochemical effect via X-ray diffraction. The ground product exhibited poly-modal distribution and the minimum size obtained was 4.28 µm at 4 kg/h, 13000 rpm and 4 bar. Besides size reduction in micron range, mechanochemical effect was exhibited by the product ground in jet mill as jet mill is classified as high-energy mill. Reduction in peak intensity and peak base broadening was observed which indicates fine grinding process in jet mill induced mechanochemical effect. Furthermore preferential distortion of (00l) planes was observed as well. The degree of crystallinity of ground sample, which ranged from 26.5% to 85.3% reduces as the specific kinetic energy increase and its reduction gradient varies according to the classifier rotational speed. The crystallite size and lattice strain of talc ranged from 147.69 nm to 353.72 nm and 0.08 to 0.2 respectively

Development Of Nanocrysta Lite Cati03 Via High Intensity Grinding Using Value Added Local Raw Materials.

Mechanochemical synthesis of calcium titanate, CaTi03 was carried out in planetary mill by varying the milling time and mill rotational speed at three levels. CaC03 and Ti02 (anatase) was used as starting materials

Study Of The Clinker Characteristics And Grindability During Cement Production.

The quality of cement product is dependent on a number of factors such as the quality of the raw material, the chemical changes during burning and cooling stages and the fineness of the grinding. Mineralogical and chemical studies on clinker will provide information about clinker characteristics and about conditions occurring at various stages of the manufacturing process

Advanced manufactured sand for high strength concrete.

Pengambilan pasir dari sungai secara berleluasa telah memberi kesan buruk terhadap alam sekitar. Kerajaan Malaysia telah mengharamkan pengambilan pasir sungai di beberapa tempat atas sebab ini. Digging of sand from the riverbeds in access quantity is hazardous to environment.The Malaysian Government has banned the quarrying of sand from riverbed in many areas