Concrete thermal diffusivity measurement device

Abstract

The invention provides a concrete thermal diffusivity measurement device. A constant temperature circulating water supply device is provided with two sets of large and small power electric heaters[27] and one set of small power electric cooler[26], wherein the heating power of the large power electric heater is larger than a heat amount required for heating circulating water to a constant temperature thermal diffusion environmental temperature within 5 minutes; the small power electric heater and the small power electric cooler are connected with a power control mechanism[F11, F21]in a temperature control device; and a control error from the constant temperature circulating water supply device to an environmental water temperature is smaller than 1 percent of the minimum allowable starting temperature of the measurement device. Compared with the prior art, the measurement device provided by the invention has the advantages that the environmental water temperature can be quickly increased so that the measurement of multi temperature sections is realized; the measurement can be performed at a thermal diffusion temperature point lower than the environmental temperature of the device, so that the measurement of the entire temperature section is realized; and the control precision of the environmental temperature is simultaneously increased, so that the initial temperature difference is reduced but the minimum measurement error value required by measurement standards can still be achieved.

Description

technical field [0001] The invention relates to a device for measuring the thermal diffusivity of concrete. Background technique [0002] There are currently two publicly available methods for measuring the thermal diffusivity of concrete. CN101915776's Chinese invention patent application "Measurement method and test device for thermal diffusivity of concrete" discloses and contains the measurement method of the People's Republic of China construction industry product standard "Concrete Thermophysical Parameter Tester" (JG / T329-2011) (referred to as BYR method). They respectively create a constant temperature water environment with lower or higher temperature outside the isothermal body specimen, so that the isothermal body specimen forms a stable forward or reverse thermal diffusion process from the center to the surface, thereby passing the During the thermal diffusion process, the temperature difference-time relationship at the center of the specimen is measured and th...

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Problems solved by technology

What's more, the flow of circulating water will also cause temperature rise. This temperature rise must be offset by the heat dissipation of the test device to the environment in order to achieve constant temperature control. Ambient water temperature cannot maintain the required constant temperature level

That is to say, the measuring device proposed in the invention patent application CN101915776 cannot measure the thermal diffusivity in the temperature region lower than the ambient temperature

[0013] In short, if the concrete thermal diffusivity measuring device in the prior art is not combined with the SL352 method, it will not be able to realize the full temperature range, that is, in the full range of concrete applicable temperature (10°C ~ 70°C) at different constant temperatures, continuous multiple The determination of the thermal diffusivity is carried out once; and the combination of the SL352 method will not avoid the disadvantages of large consumption and expensive implementation of this method.

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