T/SDGSY 17-2024 Glazing Slag Waste Based Mass Concrete Crack and Pore Sealing Technical Specification

Scope

Scope: 1 Scope This document specifies the raw materials, performance requirements, mix ratio, concrete preparation, construction, quality inspection, and acceptance of large-volume concrete based on gypsum slag. This document applies to large-volume concrete with requirements for crack resistance and impermeability in concrete engineering. Main technical content: 6 Concrete performance requirements General requirements: The concrete performance shall comply with the relevant requirements of the current GB 50496. The water-cement ratio of large-volume concrete based on gypsum slag shall not exceed 0.50, and the total amount of cementitious materials per cubic meter of concrete shall not be less than 350kg/m3. The anti-cracking grade of large-volume concrete based on gypsum slag is divided as shown in Table 6.3. Table 6.3 Technical requirements for anti-cracking of large-volume concrete based on gypsum slag Temperature cracking Early-stage drying shrinkage cracking Total cracking area per unit area (c, mm2/m2) 1) The temperature rise of the poured concrete after pouring shall be less than 35°C; 2) The temperature difference between the inside and outside of the concrete poured body shall not exceed 25°C; 3) The temperature difference between the surface of the concrete poured body and the atmosphere shall not exceed 20°C. L-Ic≥1000 L-II 1000≥c≥700 L-III 700≥c≥400 L-IV 400≥c≥100 L-V c≤100 The anti-impermeability grade of large-volume concrete based on gypsum slag is divided as shown in Table 6.4. Table 6.4 Technical requirements for anti-impermeability of large-volume concrete based on gypsum slag Concrete strength grade Anti-pressure water permeability grade (P, atm) Anti-chloride ion permeability (C, electromigration method)

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