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一、关于试件几何尺寸的影响试验表明,15厘米的试件比之10厘米的试件,不论是表示加速养护强度,还是表示加速养护强度与标养28天强度的比值,均见略低。其原因是,试件体积相差三倍多,即试体热容量相差三倍多,因此,要达到同样热养条件的实际热功相差了一段温度与时间的乘积——度时积——成熟度。 1.不同尺寸试件的温升与度时积在混凝土成型时,预埋热电偶片于试体中心部位进行实测。试验表明,欲达100℃脱模养护,则10厘米与15厘米试件的温升时间相差近30分钟,前者的温升速度约是后者
First, the impact on the geometric dimensions of the test Test shows that 15 cm specimens than 10 cm specimens, whether it is to express the accelerated curing strength, or that the accelerated maintenance intensity and the standard 28-day intensity ratio, are slightly lower . The reason is that the volume of the specimens differs by more than three times, that is, the thermal capacity of the specimens differs by more than three times. Therefore, the actual thermal power to achieve the same thermal conditions differs by a product of temperature and time—degree-time product—maturity. . 1. Temperature rise and degree-time product of specimens of different sizes When the concrete is molded, the embedded thermocouple chip is measured at the center of the specimen. Tests show that for a 100°C stripping curing, the temperature rise time of the 10 cm and 15 cm specimens differs by nearly 30 minutes. The temperature rise rate of the former is about the latter.