Model of China Academy of Building Research |
1986 |
The pressure stress shall not exceed 0.5 fck or 0.4 fcu,k, the strength grade of common concrete shall not exceed C40, the strength grade of light-weight aggregate concrete shall not exceed LC30, the relative humidity shall be 40–80%, and the environment temperature shall be about 20 °C. For common concrete, the applicable cement content shall be 225–413 kg/m3, the water cement ratio shall be 0.44–0.75, and the sand rate shall be 0.30–0.40. For light-weight aggregate concrete, the applicable cement content shall be 225–450 kg/m3, the water cement ratio shall be 0.40–0.76, and the sand rate shall be 0.40–0.55. |
ACI209R (1992) |
1992 |
The relative humidity shall be 40–80%; the cement of Type I and II shall be maintained in moisture for no less than 7 days and maintained in steam for no less than 1 day. |
CEB-FIP (1978) |
1978 |
When the component hardens under the constant environment, the stress shall not exceed 0.4 fcu,k. Concrete maintained under extremely high or low temperature and heat is not applicable. |
CEB-FIP (1990) |
1990 |
For common structural concrete, the compressive stress in the concrete age of loading shall be less than 0.4 fcu,k, the average compressive strength of concrete in 28 days shall be 20–90 MPa, the relative humidity shall be 40–100%, the average temperature shall be 5–30 °C, the cement of Type I, II, and III shall be maintained in moisture for less than 14 days and maintained in steam for less than 14 days, and tension concrete is allowed. |
BP |
1995 |
The average compressive strength of concrete in 28 days shall be 17.2–69 MPa, the aggregate/cement ratio shall be 2.5–13.5, the cement content shall be 160–719 kg/m3, the water cement ratio shall be 0.35–0.85, the relative humidity shall be 40–100%, and the drying situation before loading of cement of Type I, II, and III shall be calculated. |
GL2000 Model |
2000 |
The average compressive strength of concrete in 28 days shall be 16–82 MPa, the water cement ratio shall be 0.40–0.60, the relative humidity shall be 20~100%, and the drying situation before loading of cement of Type I, II, and III shall be calculated. |