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《砖石结构设计规范 GBJ-3-73》附录三注①规定:混合砂浆和水泥砂浆在温度为20±3℃时,龄期t≤90天的强度可按下式确定: R_t=1.5+R_(28)/14+t 式中R_t——90天内不同龄期时砂浆的强度; t——龄期(天); R_(28)——28天龄期时砂浆的强度(砂浆标号)。经核实,发现此公式有误。现另给出一个公式,供读者参考: R_t=R_(28)1.43t/12+t (1) 公式(1)适用于普通水泥,养护温度为20±3℃。当养护温度为15℃时,R_t×0.9; 当养护温度为10℃时,R_t×0.7;
“Notes 1 of the Design Code for Masonry Structures GBJ-3-73” in Note 3 stipulates that when the temperature of the mixed mortar and cement mortar is 20 ± 3 °C, the strength at the age t ≤ 90 days can be determined by the following formula: R_t = 1.5 + R_(28)/14+t where R_t is the strength of the mortar at different ages within 90 days; t is the age (days); R_(28) is the strength of the mortar at the 28-day age (mortar marking) . Upon verification, this formula was found to be incorrect. Another formula is given for readers’ reference: R_t=R_(28)1.43t/12+t (1) Formula (1) applies to ordinary cement, and the curing temperature is 20±3°C. When the curing temperature is 15°C, R_t×0.9; when the curing temperature is 10°C, R_t×0.7;