SU551550A1 - Device for continuous control of hardening concrete strength - Google Patents

Description

one

The invention relates to construction and is intended to continuously monitor the strength of concrete that hardens under positive and negative temperature conditions.

A device for controlling the strength and automatic control of heat treatment of reinforced concrete products is known, comprising a follow-up unit, an erection unit in

A degree, an integration unit, an indicator-comparing unit and a temperature sensor.

It is also known a device for the continuous monitoring of the strength of hardening concrete, containing a temperature sensor, connected via a tracking unit to a P-degree signal return unit, an integration unit and an indicator-comparator unit.

However, the known devices cannot control the growth of the strength of concrete hardening at a negative temperature. The permeability of concrete in them is modeled depending on the temperature-time equivalent on a non-linear circular chuck, mechanically connected with the integrator, which makes it inconvenient to operate, so the SCCP requires the replacement of individual modeling elements when the composition of the concrete ir cHii is changed is accurate.

The aim of the invention is to improve the accuracy of the device.

This is achieved by the fact that the device is equipped with multiplying, dividing, summing, and pulse frequency temperature converters, the input of which is connected to the output of the signal raising unit to the T degree and the output through the integrating unit to the inputs of the multiplying and summing units to the inputs of the dividing unit, the output of the dividing unit is connected to the input of the indicator-matching unit.

The drawing shows a block diagram of a device for continuously monitoring the strength of hardening concrete.

Claims (1)

The device contains a temperature sensor 1, a trailing unit 2, a signal raising unit 3, a frequency-frequency converter 4, an integration block 5, a multiplication unit 6, a summation unit 7, a division unit 8, and a reference-comparison unit 9 and a unit memory 10. A temperature sensor 1, placed in a hardening concrete, is connected to a tracking unit 2, which converts the signal coming from the sensor into linear displacements. The output of the trailing unit is connected to the memory unit 10, where the temperature of the hardening concrete is continuously recorded. The signal from the output of the tracking unit in the form of a linear movement controls the operation of the signal raising unit to the P-th degree 3, which performs a mathematical operation (T + T where TO is the critical temperature, with which the cement hydration processes cease; T- hardening temperature of the concrete; P is a constant characterizing the type of cement. This is achieved with the help of a sectioned rheochord, which allows one to produce a linear-piecewise approximation of the function (). The change of the coefficient n is achieved by shunting the rheochord at a certain The resistance of the reichord is transformed by block 4 into a partial-pulse signal proportional to) which enters the integration block 5, the output of which accumulates a signal proportional to the temperature-time equivalent of 9 J (Tt-TQ) 6t. Le b is the duration of concrete hardening. The strength of concrete is associated with a temperature-time equivalent dependence of TE-T b where R. and S) - permanent - 1 concrete. The signal, proportional to Q, is fed to the inputs of multiplication unit 6 and summation unit 7, where it is multiplied by and summed with the signals given in the form of electrical signals. In division block 8, the function I o is modeled. and in the indicator-comparing unit 9, the result is displayed on a digital reading device and is stored by the memory unit 10. The device for continuous monitoring of the strength of hardening concrete provides for operation with any programmable temperature controller. The use of a device for continuous monitoring of concrete strength will improve the accuracy of measurements, take into account the exotherm of concrete, carry out a digital indication of the growth of concrete strength with access to the ACS-TP, significantly reduce the heat treatment time of products, reduce the consumption of heat-transfer agent and improve product quality. The use of such devices on the aggregate of the flow lines for the production of bridge spans at the Dnepropetrovsk bridge concrete reinforcement plant yields an economic effect of more than 4,000 rubles. on one device. At present, the need for such devices for the construction industry is more than 100 pcs. in year. The total economic effect that can be obtained is more than 4 million rubles per year. Apparatus of the Invention A device for continuous monitoring of the strength of hardening concrete, comprising a temperature sensor, connected through a tracking unit to an 11-degree power raising unit, an integrating unit and a search-and-matching unit, so that In order to improve the accuracy of the device, multiply, divide, sum, and a frequency-frequency converter of temperature are installed in it, the input of which is connected to the output of the signal raising unit to the -th power and output through the integration unit to moves multipliers and summing their outputs coupled to the inputs of the block division, block dividing output connected to the input indicator-comparator block. tl,