Mortar using the reforming recycled fine aggregate treated with fluosilicic acid

• Main Authors: RYU, HWA SUNG, SHIN, SANG HEON, PARK, WON JUN, KIM, DEUCK MO
• Format: Patent
• Language: English; Korean
• Published: 11.05.2018
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; DISPOSAL OF SOLID WASTE; LIME, MAGNESIA; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLIDMATERIALS OR FLUIDS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROMSOLID MATERIALS OR FLUIDS; METALLURGY; MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING; OTHER SEPARATING BY DRY METHODS APPLICABLE TO BULK MATERIAL,e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; RECLAMATION OF CONTAMINED SOIL SOIL; REFRACTORIES; SEPARATING SOLIDS FROM SOLIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS; SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATICTABLES OR JIGS; SEPERATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, ORSIFTING OR BY USING GAS CURRENTS; SLAG; SORTING; TRANSPORTING; TREATMENT OF NATURAL STONE

The present invention relates to a modified fine recycled aggregate processed with fluorosilicic acid, to lower strong alkalinity, which is pH 11 to 13, caused by calcium hydroxide of mortar or paste attached on a surface of recycled aggregate produced by recycling of used concrete; a manufacturing method thereof, and a mortar using the modified fine recycled aggregate manufactured thereby. According to the present invention, recycled fine aggregate with a particle size of 5 mm or less is precipitated in a neutralization tank processed by fluorosilicic acid to neutralize the aggregate between pH 6.5 to 10 so as to realize pH reduction; the fluorosilicic acid is reacted by an agitator to inhibit a continuously eluted alkali material while modifying the aggregate through a chemical reaction and a pilling action with the calcium hydroxide in the paste on the surface of the recycled fine aggregate; and a chemical reaction generating CaF_2 and SiO_2, which are inorganic powder, is accompanied as the calcium hydroxide reacts with the fluorosilicic acid; and such reaction is gradually advanced towards the inside from the surface of the recycled fine aggregate so as to realize absorption rate reduction. Thus, provided are effects capable of: ensuring a high quality recycled fine aggregate; using the fluorosilicic acid with the strong alkalinity generated or produced as a by-product during processing and manufacturing processes of phospho-gypsum, phosphatic fertilizer, and the like, so as to reduce costs in comparison with the case that an expensive material, such as acetic acid, phosphoric acid, etc., is used, thereby enhancing economic efficiency; and not adversely affecting an ecosystem as processing water of the neutralization tank is neutralized, thereby being able to be environmentally-friendly used. 본 발명은 폐콘크리트 재활용으로 생산되는 순환골재의 표면에 부착된 모르타르 또는 페이스트의 수산화칼슘에 기인안 pH 11 내지 13의 강알리성을 저하시키는 것으로서, 입경 5mm 이하의 순환잔골재를 불화규산으로 처리되는 중성화조에 침전시켜 pH 6.5 내지 10 사이로 중성화하여 pH 저감을 구현하고, 교반기에 의해 불화규산이 반응하여 순환잔골재 표면의 페이스트 내 수산화칼슘과 화학반응 및 박리작용을 통하여 개질시키면서 지속적으로 용출되는 알칼리성 물질을 억제함은 물론 상기 수산화칼슘이 불화규산과 반응하면서 무기미분체인 CaF, SiO가 생성되는 화학반응을 수반하고, 이와 같은 반응이 순환잔골재 표면으로부터 내부로 점차 진행되어 궁극적으로 흡수율 저감을 구현함으로써, 고품질의 개질순환잔골재를 확보할 수 있을 뿐만 아니라 인산석고, 인산비료 등의 처리 및 제조과정에서 발생되거나 생산되는 부산물인 강산성의 불화규산을 사용하여 아세트산이나 인산 등의 고가의 재료를 사용할 때 보다 원가를 절감하여 경제성을 향상시키며, 중성화조의 처리수는 중성화되어 생태계에 악영향을 주지 않아 친환경적으로 사용할 수 있는 불화규산으로 처리되는 개질순환잔골재와 이의 제조방법 및 이의 제조방법으로 제조된 개질순환잔골재를 이용한 모르타르에 관한 것이다.