SHOTCRETE COMPOSITION INCLUDING HIGH STRENGTH ACCELERATING AMORPHOUS CALCIUM ALUMINATE

摘要

PURPOSE: A shotcrete composition including set accelerator agents of cement mineral for high intensity shotcrete is provided to reduce the thickness of shotcrete by satisfying early strength and long term intensity without using high-intensity blending material. CONSTITUTION: A shotcrete composition including set accelerator agents of cement mineral for high intensity shotcrete comprises cement 17-24 weight%, aggregate 64-74 weight%, water 6-12weight%, and high-intensity set accelerator agent 1-2 weight%. The set accelerator agent use powdery cement mineral system. The set accelerator agent comprises 12CaO·7Al2O3 powder 55-75 weight% which is the main raw material, calcium sulfo aluminate 0.1-10 weight%, a hardening accelerator 0.5-7weight%, an anhydrous gypsum 15-35 weight%, and micro powder pozzolan 5-10 weight%. A calcium sulfoaluminate steadily forms ettringite and enhances long term intensity when reacting with cement. Anhydrous gypsum enhances latter term hardening rate and compressive strength. Micropowder pozzolan enhances long term intensity, chemical resistance, and seawater resistance. [Reference numerals] (AA) High intensity cement mineral-based accelerating agent manufacturing process; (B1) A process - 12CaO, 7Al_2O_3 powder preparing process; (B10) A-9 process - melting process; (B11) A-10 process - impurity extracting process; (B12) A-11 process - water cooling process; (B13) A-12 process - clinker component intermediate inspecting process; (B14) A-13 process - clinker coarse grinding process; (B15) A-14 process - sorting process; (B16) A-15 process - work in process storage process; (B17) A-16 process - measuring process; (B18) A-17 process - fine grinding process; (B19) A-18 process - finely ground product intermediate inspecting process; (B2) A-1 process - ingredient inspecting process; (B20) A-19 process - 12CaO, 7Al_2O_3 powder packaging process; (B3) A-2 process - mixing process for generating seeds; (B4) A-3 process - alumina byproduct granulating process; (B5) A-4 process - alumina byproduct drying process; (B6) A-5 process - granulated alumina byproduct storage process; (B7) A-6 process - ingredient measuring process; (B8) A-7 process - measured ingredient mixing process; (B9) A-8 process - mixed ingredient injecting and fusing agent adding process; (C1) B process - high intensity accelerating agent manufacturing process; (C2) B-1 process - ingredient acceptance inspecting process; (C3) B-2 process - main ingredient and additive measuring process; (C4) B-3 process - mixing process; (C5) B-4 process - product storing process; (C6) B-5 process - product inspecting process; (C7) B-6 process - packaging process with paper bag, ton bag, and others