【摘 要】
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In this paper, experimental results on binary systems blending effect of cement mortar with various amounts of additives by cement weight with same fineness value, including precipitation speed of was
【机 构】
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Centre for Chemistry and Technology of New Materials, National University of Mongolia, University st
【出 处】
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The 14th International Congress on the Chemistry of Cement (
论文部分内容阅读
In this paper, experimental results on binary systems blending effect of cement mortar with various amounts of additives by cement weight with same fineness value, including precipitation speed of wasted overburden (hereinafter referred to as OB) at coal and other mining was investigated.The binary systems of blended cements were prepared by using Portland cement OPC 42.5 of"Khutul" CLC (Cement and Lime Company) and heat or alkali treated additive types of Tawan Tolgoi (hereinafter referred to as TT) or Baga-Nuur (hereinafter referred to as BN) coal mining by-product as artificial pozzolans.Besides chemical, mineralogical composition and differential thermo analyses for the Khutul cement and the TT or BN overburdens, the physics-chemical characteristics as grain size distribution, hydrogen ion saturation factor, pH, mineral and chemical some characteristics, suspension activity in some inorganic solution, and their suspension state were determined in detail for each overburden samples.The suspension solution of each overburden samples was prepared while kept them for 24 hours.A coagulation speed of Baga-Nuur overburden suspended samples activated by 1%, 3%,5%, 10%, 15%, 20% of alkali or alkali earth metals as sodium hydroxide;potassium hydroxide;and calcium hydroxide solution respectively was presented in this paper as well.TT Overburden was activated by thermal method in 550, 650,750℃ for 1, 2, 3 hour respectively and preferred 2h at 750℃ from them.Physics-mechanical properties as compressive strengths of blended cement, which was strengthened while kept them for 3, 7, 28, 90 days in water condition, were increased by 200-250 kg/cm2 under the strength comparison control of Portland cement to the binary systems effect of pozzolans related with self-compacting ability of various amounts of cement weight by 5-20%.TEM, XRD analyses showed that a large quantity of sheet-like CSH was formed when a combination of activated metakaolinite additives.by thermal and alkali method.
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