Method and device for measuring specific resistance and 28-day strength of cement
A technology of cement resistance and resistivity, which is applied in measuring devices, measuring resistance/reactance/impedance, measuring electrical variables, etc., can solve the problems that the accuracy of measurement results cannot meet the construction requirements, high experimental cost, complicated operation, etc., and achieve measurement The effect of accurate and reliable results, good adaptability, and simple method
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Embodiment 1
[0042] Such as figure 1 As shown, this embodiment provides a device for measuring cement resistivity, including a signal generating device 1 , a primary coil 3 , an iron core 4 , a secondary coil placement part 5 , a voltage measuring device 6 and a current measuring device 7 . Wherein, the signal generating device 1 is connected with the primary coil 3 to provide an input signal so that the primary coil 3 has an alternating voltage. The primary coil 3 is arranged on the iron core 4 and cooperates with the iron core 4. When the primary coil 3 generates When the alternating voltage is applied, the iron core 4 induces the alternating current of the primary coil 3 to generate an alternating magnetic field. The secondary coil placement part 5 is mainly used to place the annular secondary coil made of the cement sample to be tested. The alternating magnetic field generated by the iron core passes through the secondary coil placement part, thereby affecting the placement of the seco...
Embodiment 2
[0050] The present embodiment provides a kind of method for measuring cement resistivity, and this method utilizes the device for measuring cement resistivity in embodiment 1 to measure, specifically comprises the following steps:
[0051] Making the cement sample to be tested into a ring-shaped secondary coil, and placing the secondary coil on the secondary coil placement part of the device for measuring the cement resistivity;
[0052] The signal generator sends out a signal to make the primary coil generate an alternating voltage signal;
[0053] The alternating voltage signal is induced by the iron core to form an alternating magnetic field;
[0054] The secondary coil made of the ring-shaped cement sample induces the alternating magnetic field, forming ring voltage V and ring current I in the ring-shaped cement sample;
[0055] Measure the ring voltage V and ring current I of the secondary coil, and calculate the resistance value and resistivity of the ring cement sample...
Embodiment 3
[0059] The present embodiment provides a kind of method of rapid determination cement 28 days intensity, comprising:
[0060] Determination of resistivity ρ of cement at 24 hours 24h , and calculate the strength of cement at 28 days according to the following formula:
[0061] R 28d =6.017×ρ 24h +30.4.
[0062] As a preference of the foregoing embodiment, the resistivity p of the measured cement hydration for 24 hours 24h It can be realized by using the method in Embodiment 2 and the device provided in Embodiment 1.
[0063] In this embodiment, the resistivity of the cement at 24 hours (resistivity at the time of cement hydration for 24 hours) is measured by a simple method, and the strength value of the cement at 28 days can be obtained by substituting it into the above formula, without molding and curing the cement. Change the cement characteristics, the measurement results are accurate and reliable, and continuous automatic measurement can be realized without people. T...
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