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Related equipmentConstant loading cement pressure testing machine

Introduction:

It is a newly developed and manufactured testing instrument for the cement and concrete industry by Shanghai Meiyu Instrument Equipment Co., Ltd. Mainly used to detect the standard consistency, water demand, and setting time of cement paste. Suitable for the determination of Portland cement, ordinary cement, slag cement, volcanic ash cement, fly ash cement, and other types of cement.

Construction and performance:
This Vicat instrument is mainly composed of cast iron seat, bracket, sliding rod, scale, circular mold, test rod, test needle and other parts. The elastic screw next to the sliding rod is used to adjust the height, and the pointer is fixed on the sliding rod by a fixed sleeve and screw to measure the movement of the sliding rod.
This Vicat instrument has a double-sided indicator engraving control ruler, which reads through the movement of the sliding rod and the indicator pin fixed on the sliding rod. On the left side of the scale is S, indicating a sinking depth of MM. The scale range is 0-70 millimeters, with a small scale spacing of 1 millimeter. On the right side of the scale is P, with a scale of 21-33%, indicating the water consumption for standard consistency.
The standard consistency test rod is used to determine consistency, and the test needle is used to determine setting time. The test rod and needle can be disassembled and used according to testing requirements.

Usage and maintenance:
Before use, it is necessary to inject a small amount of lubricating oil into the sliding part and check if it can slide freely up and down.
■ Determination of standard consistency: After mixing is completed, immediately put the mixed cement paste into the test mold placed on the glass substrate, use a small knife to compact it, gently vibrate it several times, scrape off excess paste, smooth it out, quickly move the test mold and substrate to the Vicat apparatus, and center it under the test rod. Lower the test rod until it contacts the surface of the cement paste, tighten the screw, and suddenly relax it, allowing the test rod to sink vertically and freely into the cement paste. Record the distance between the test rod and the bottom plate when the test rod stops sinking or is released for 30 seconds. After lifting the test rod, immediately wipe it clean. The entire operation should be completed within 1.5 minutes after mixing. The standard consistency of the cement slurry is the one that sinks the test rod into the slurry and is 6mm ± 1mm away from the bottom plate. The mixing water amount is the standard consistency water amount (P) of the cement, calculated as a percentage of the cement mass.
■ Determination of initial setting time: The specimen is cured in a moisture curing box for 30 minutes after adding water, and * measurements are taken. When measuring, remove the mold from the moisture curing box and place it under the test needle, reducing the contact between the test needle and the surface of the cement paste. After tightening the screw, suddenly loosen it after 1-2 seconds, and the test needle should sink vertically and freely into the cement paste. Observe the reading of the pointer when the test needle stops sinking or is released for 30 seconds. When the test needle sinks to a distance of 4mm ± 1mm from the bottom plate, the cement reaches the initial setting state. The time from when all the cement is added to the water to the initial setting state is the initial setting time of the cement, expressed in minutes.
Measurement of final setting time: In order to accurately observe the sinking condition of the test needle, a circular attachment was installed on the final setting needle. After completing the initial setting time measurement, immediately remove the test mold and slurry from the glass plate by translation and flip them 180 °. Place the larger end of the diameter upwards and the smaller end downwards on the glass plate, and then place them in a moisture curing box to continue curing. Measure every 15 minutes near the final setting time. When the test needle sinks 0.5mm into the specimen, that is, when the circular attachment cannot leave any traces on the specimen, it is considered that the cement has reached the final setting state. The time from adding all the cement into the water to the final setting state is the final setting time of the cement, expressed in minutes.
Attention should be paid to the measurement. During the initial testing process, the metal column should be gently supported and slowly lowered to prevent the test needle from hitting and bending. However, the result should be based on free fall. During the entire testing process, the position where the test needle sinks should be at least 10mm away from the inner wall of the test mold. Measurements should be taken every 5 minutes near the initial setting time and every 15 minutes near the final setting time. When reaching the initial or final setting, measurements should be repeated immediately. Only when the two conclusions are the same can the initial or final setting state be determined. Each measurement should not allow the test needle to fall into the original needle hole. After each test, the test needle must be wiped clean and the test mold should be placed back in the moisture curing box. The entire testing process should prevent the test mold from being subjected to vibration.

Parameters:
■ Total weight of sliding parts such as test cone: 300g
■ Cone sliding large stroke: 70mm
Net weight: ≈ 3.8kg