Abstract:
PURPOSE: An environmentally-friendly mortar composition is provided to remove indoor harmful gas while satisfying base physical properties of the mortar composition for floors. CONSTITUTION: An environmentally-friendly mortar composition comprises 0.1-5 parts by weight of modified cellulose based primary carbide and 10-30 parts by weight of mixed solution based on 100 parts by weight of dried mortar which includes 10-50 weight% of cement and 50-90% of sand. A manufacturing method of the modified cellulose based primary carbide comprises the following steps: activating by adding the hydroxide solution to the cellulose-based primary carbide; and reacting the activated cellulose-based primary carbide with one of including fluorine, oxygen or a mixed gas of oxygen and fluorine. The concentration of the hydroxide solution is 2-8M. The activation process is performed at 700-900 deg. Celsius at a ramp-up rate of 5-10 deg. Celsius/min for 0.5-4 hours. If the activated cellulose-based primary carbide is reacted with fluorine or oxygen, the pressure of fluorine or oxygen is respectively 0.0102bar.
Abstract:
PURPOSE: An environment-friendly low carbon binder which is grafted with metallic salt-based reactive compound and a concrete composition using thereof are provided to reduce hydration heat followed by use of reaction accelerator and to improve mobility and durability. CONSTITUTION: An environment-friendly low carbon binder which is grafted with metallic salt-based reactive compound comprises 1-5 parts by weight of reactive compound and 1-3 parts by weight of acetate based compound based on 100.0 parts by weight of binder. The binder comprises 10-40 parts by weight of cement and 60-90 weight% of blending material. The blending material is one or more which are selected from fly ash and blast furnace slag. The reactive compound is one or more which are selected from magnesium salt based compound, lithium salt based compound, and sodium salt based compound. The cement is a first OPC(ordinary Portland cement). The magnesium salt based compound is MgCl2·6H2O. The lithium salt based compound is LiNO3·3H2O. The sodium salt based compound is Na2S2O3·5H2O. The acetate based compound is CH3COONa·3H2O.
Abstract:
PURPOSE: An eco-friendly plasticizer composition for concrete is provided to maintain mobility and compression strength without toxic material such as formaldehyde. CONSTITUTION: An eco-friendly plasticizer composition for concrete contains: 10-14 wt.pt. of carboxyl composite, 20-70 wt.pt of lignin,1-7 wt.pt of sodium laureth sulfate, 0.5-5 wt.pt. of sodium gluconate, and 0.5-5 wt.pt of triethanolamine.
Abstract:
A low heat concrete composition is provided to ensure specified concrete strength, maximize a substitution ratio of cement with fly ash and blast furnace slag fine powder, and increase a hydration heat reduction effect of concrete. A low heat concrete composition is obtained by mixing 13-40wt.%of a ternary system latent binder with 20-50wt.%of fine aggregate, 25-55wt.%of coarse aggregate, and 5-8wt.%of one water selected from industrial water and tap water. The ternary system latent binder is obtained by mixing 0.5-2.5wt.%of a high-performance air-entrained agent with 0.5-10wt.%of a liquefied latent hydration heat reducing agent, based on 100 parts by weight of a binder prepared by mixing 30-60wt.%of general purpose portland cement or blast furnace slag cement, 30-60wt.%of blast furnace slag fine powder, and 10-30wt.%of fly ash. The liquefied latent hydration heat reducing agent is prepared by mixing 15.3-32.0wt.%of a silica-based diluted solution, 3-60wt.%of a latent mixture of nitrate-, chloride-, and phosphate-based compounds, and 8.0-81.7wt.%of water. Further, the silica-based diluted solution of the liquefied latent hydration heat reducing agent is manufactured by diluting 60.0-95.0 wt.% of one selected from Na2SiO3, Si(OH)4, TEOS[Si(OC2H5)] with water.
Abstract:
A hydration heat reducing agent is provided to reduce hydration heat of concrete more efficiently, inhibit an initial strength decline of concrete, and decrease the amount of a high-performance water-reducing agent used. A hydration heat reducing agent containing a three-component latent heat storage composition is prepared by the steps of: (S1) diluting 60-95% of a silica-based solution with water to produce 20-50% of a silica-based dilute solution; (S2) mixing 1.0-35.0wt% of a nitrate-based latent heat storage compound having a purity of 98% or higher, 1.0-20wt% of a chloride-based latent heat storage compound having a purity of 98% or higher, and 1.0-5.0wt% of a phosphate-based latent heat storage compound having a purity of 98% or higher to produce a latent heat storage composition; and (S3) adding 15.3-32.0wt% of the silica-based dilute solution and 3.0-60.0wt% of the latent heat storage composition into 8.0-81.7wt% of water to prepare a solution.
Abstract:
본 발명은 3∼20중량%의 규불화염; 5∼15 중량%의 교질상 실리카; 44∼89중량%의 물; 0.5∼5.0중량%의 수화열조절제; 1∼3.0중량%의 고분자축합물; 및 1∼10중량%의 무기고분자 발수제를 포함하는 것을 특징으로 하는 수밀 콘크리트 혼화용 규불화염계 수화열 저감제 조성물 및 그 제조방법에 관한 것이다. 본 발명에 의한 수밀 콘크리트 혼화용 규불화염계 수화열 저감제 조성물을 콘크리트에 첨가하면 콘크리트의 유동성 저하 현상을 억제할 수 있고, 콘크리트 경화시 압축강도의 향상과 길이변화 및 건조수축률의 저감과 같은 경화특성을 향상시킬 수 있으며, 수화시의 수화열을 억제하여 콘크리트의 균열 제어, 수밀성 및 내구성을 향상시키는 효과를 얻을 수 있다.