Product introduction of cement standard consistency meter:
The cement standard consistency meter is manufactured in accordance with the provisions of GB / T1346-2001 "Standard Consumption Water Consumption, Setting Time, and Safety Inspection Methods for Cement Paste". The cement standard consistency meter is suitable for the determination of Portland cement, ordinary cement, slag cement, pozzolan cement, fly ash cement and other cements. The test cone method of the cement standard consistency meter is the representative method of the standard consistency measurement method, and the test rod method is the standard method of the standard consistency measurement method. Therefore, the test cone method can still be used to measure the standard consistency in daily tests. For standard consistency measurement (standard method), determination of initial setting and final setting time. When measuring the standard consistency of cement paste according to the new standard (standard method), only the sliding part of the original setting time tester needs to be replaced while the fixed part (bracket and scale) are unchanged. Made of stainless steel, it is more durable than conventional steel plating materials.
Technical parameters of cement standard consistency meter:
★ Slide bar: 1 piece. φ12mm + 0.02mm-0.10mm
★ Standard consistency test rod: 1: Effective length: 50mm ± 1mm Diameter: φ10mm ± 0.05mm
★ Test needles for initial setting: 2 pieces. Effective length 50mm ± 1mm Diameter: φ1.13mm ± 0.05mm
★ Test pins for final setting: 1: effective length 30mm ± 1mm diameter: φ 1.13mm ± 0.05mm
★ Reading pointer: one
★ Total weight of sliding part: 300g ± 1g
Three, cement standard consistency instrument structure:
★ This Vicat instrument is mainly composed of cast iron base, bracket, sliding rod, scale, garden mold, test rod, test needle and other pieces. The elastic screw beside the sliding rod is used to adjust the height. The pointer is fixed on the slide by the fixing sleeve and screw. To measure the movement of the sliding rod.
★ This Vicat instrument has a double-sided index engraving ruler. By moving the slide bar, the indicator pin fixed on the slide bar is used for reading. The left side of the scale is S, which indicates the sinking depth MM, the scale range is from 0 to 70 mm, the small scale interval of A is 1 mm, the right side of the scale is P, and the scale is 21 to 33%, indicating the standard consistency water consumption.
★ The standard consistency test rod is used to determine the consistency, the test needle is used to determine the setting time, and the test rod and the test needle can be used detachably according to the test requirements.
Fourth, the use and maintenance of cement standard consistency instrument:
★ Before use, the sliding part needs to be filled with a little lubricating oil, and check if it can slide up and down freely.
★ Determination of standard consistency: Immediately after mixing, put the mixed cement paste into the test mold which has been placed on the glass bottom plate, insert it with a knife, gently shake it several times, and scrape off the excess paste. After smoothing, quickly move the test mold and the bottom plate to the Vicat instrument, and set its A under the test rod, lower the test rod until it comes into contact with the surface of the cement paste. After tightening the screws, suddenly relax, so that the test rod is vertical and free Sink into the cement paste. Record the distance between the test rod and the bottom plate when the test rod stops sinking or releases the test rod for 30S. After lifting the test rod, wipe it immediately. The entire operation should be completed within 1.5min after stirring. The cement paste of which the test rod sinks into the paste and is 6mm ± 1mm from the bottom plate is the standard paste. The mixing water volume is the standard consistency water volume (P) of the cement, calculated as a percentage of the mass of the cement.
★ Determination of initial setting time: A test is performed when the test piece is cured in the moisture curing box to 30 minutes after adding water. During the measurement, take out the round mold from the moisture curing box and place it under the test needle, and reduce the contact between the test needle and the surface of the cement paste. After tightening the screws, it suddenly relaxes after 1s ~ 2s, and the test needle sinks into the cement paste vertically and freely. Observe the reading of the pointer when the test needle stops sinking or releases the test needle for 30s. When the test needle sinks to 4mm ± 1mm from the bottom plate, it is the initial setting state of the cement. The time from when all cement is added to the water to the initial setting state is the initial setting of the cement. Time, expressed in min.
★ Determination of final setting time: In order to accurately observe the state of the test needle sinking, a ring attachment is installed on the final setting needle. Immediately after measuring the initial setting time, the test mold and the slurry were removed from the glass plate by a translation method and turned 180 °, with the large end facing up, the small end facing down on the glass plate, and then placed in the moisture conservation box to continue For curing, it is measured every 15 minutes near the final setting time. When the test needle sinks into the test body 0.5mm, that is, when the ring attachment can not leave marks on the test body, the cement reaches the final setting state. The final setting time is the final setting time of the cement, which is expressed in min.
★ Cement standard consistency meter and cement Vicat meter should be noted. During the operation of the initial measurement of A, the metal column should be gently supported to slowly drop it to prevent the test needle from colliding, but the result is based on free fall. During the entire test, the position where the test needle sinks should be at least from the test mold. The inner wall is 10mm, and the initial setting time is measured every 5min, and the final setting time is measured every 15min. When the initial setting or final setting is reached, the measurement should be repeated immediately. When the two conclusions are the same, it can be determined to reach the initial setting or final setting. Condensed state. Do not let the test needle fall into the original pinhole for each measurement. After each test, the test needle must be wiped clean and the test mold must be returned to the moisture curing box. The entire test process must prevent the test mold from being vibrated.