T/CPFIA 0010-2023
Phosphogypsum-based road construction materials (English Version)

Standard No.
T/CPFIA 0010-2023
Language
Chinese, Available in English version
Release Date
2023
Published By
Group Standards of the People's Republic of China
Latest
T/CPFIA 0010-2023
 

Scope
The materials used in road engineering should comply with the provisions specified in Table 1. Table 1 Technical Requirements for Gypsum Dicalcium Sulfate Item Unit Standard 1 Calcium sulfate dihydrate (CaSO4·2H2O) (dry basis) % ≥70 2 Attached water (H2O) (wet basis) % ≤25 3 Water-soluble pentoxide of phosphorus (P2O5) (dry basis) % ≤0.50 4 Water-soluble fluoride ion (F-) (dry basis) % ≤0.30 5 Chloride ion (Cl-) (dry basis) % ≤0.04 6 Water-soluble magnesium oxide (MgO) (dry basis) % ≤0.30 7 Water-soluble sodium oxide (Na2O) (dry basis) % ≤0.10 8 pH value — ≥6 Note 1: The pH value is agreed upon by the supplier and user. However, considering the actual situation of pavement materials, the minimum limit control is set at 6. Note 2: Items 1 to 8 are tested according to the methods specified in GB/T 23456. The leachate from gypsum dicalcium sulfate-based road materials after养护14 days should meet the requirements listed in Table 2. Table 2 Limit Values for Leachate of Gypsum Dicalcium Sulfate-Based Road Materials Item Unit Standard 1 Phosphate (as P) mg/L ≤0.5 2 Fluoride (as F-) mg/L ≤10 3 Total mercury mg/L ≤0.05 4 Total cadmium mg/L ≤0.1 5 Total chromium mg/L ≤1.5 6 Total arsenic mg/L ≤0.5 7 Total lead mg/L ≤1.0 8 pH value — 6~9 9 Chemical oxygen demand (CODCr) mg/L ≤70 10 Total nitrogen mg/L ≤15 11 Ammonia nitrogen mg/L ≤10 Note 1: The characteristic pollutants are extracted according to the methods specified in HJ 557. Note 2: Testing for items 1 to 8 is conducted according to the methods specified in GB 8978; testing for items 9 to 11 is conducted according to the methods specified in GB 15580. Cement should comply with JTG/T F20 specifications. Coarse aggregate shall be determined based on road grade, following JTG/T F20. Fine aggregate shall be determined based on road grade, following JTG/T F20. The stabilizer should meet the relevant provisions of CJ/T 486. Water used in mixing should comply with the requirements specified in JTG/T F20.

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