First, the cement slurry vertical expansion ratio tester is used to determine the compensation shrinkage performance of the slurry, and quantitatively determine the vertical expansion of the slurry material.
Second, the main parameters of cement slurry vertical expansion rate tester:
★ Test mold size: ￠ 100 * 100mm
★ Test mold material: metal
★ Dial indicator range: 0-10mm, accuracy 0.01mm
★从测定初始读数起，每隔2h 浇水1 次。连续浇水4 次。以后每隔4h 浇水1 次。保湿养护至要求龄期，测定3d、7d 试件高度读数。
★灌浆料加水搅拌均匀后立即灌模。从玻璃板的一侧灌入。当灌到50mm左右高度时，用捣板在试模的每一侧插捣6 次，中间部位也插捣6 次。灌到90mm高度时，和前面相同再做插捣，尽量排出气体。后一层灌浆料要一次灌至两侧流出灌浆料为止。要尽量减少灌浆料对玻璃板产生的向上冲浮作用。
ht ——试件龄期为t 时的高度读数（mm）；
Third, the operation steps of the cement slurry vertical expansion ratio tester:
★ Watering is performed every 2h from the initial reading of the measurement. Continuous watering 4 times. After that, water every 4h. Moisturize and maintain to the required age, and measure the height readings of 3d and 7d specimens.
★ From the initial reading of the measurement, the measuring device and test piece should be kept still and not subject to vibration.
★ The water consumption of the grout is based on the water consumption of 250 ± 10nirn.
★ Fill the mold with water and stir evenly. Fill from one side of the glass plate. When pouring to a height of about 50mm, use a tamping board to insert 6 times on each side of the test mold, and also insert 6 times in the middle. When pouring to a height of 90mm, do the same as before, and try to exhaust the gas. The next layer of grout should be filled at one time until the grout flows out from both sides. It is necessary to minimize the upward flushing effect of the grout on the glass plate.
★ Fill the surface of the slurry on both sides of the glass plate with a knife and gently wipe it into a slope. The lower edge of the ramp is flush with the top surface on the inside of the test pattern. The time for wiping the slope should not exceed 30s. The molding temperature and curing temperature are both (20 ± 3) ℃.
★ After finishing the slope, lay the measuring head of the dial indicator on the glass plate, and record the dial indicator reading within 30s. Is the initial reading.
★ Within 30s of the initial reading, cover the two sides of the glass plate with two layers of wet cotton on the surface of the grout.
★ Calculation of vertical expansion rate:
Where-vertical expansion rate; t ε
h0-initial reading of test piece height (mm);
ht —— height reading (mm) when the age of the test piece is t;
h ——The reference height of the test piece is 100 (mm).
The test results are taken as the arithmetic mean of a set of three test pieces and calculated from ** to 10-2.
Fourth, SPZ-100 cement slurry vertical expansion rate instrument composition:
★ One digital dial indicator
★ One dial stand
★ 1 cylindrical test mold
★ Stand: 1
★ 1 glass plate
★ The dial indicator reading is adjusted to 0, and the initial reading L0 is recorded.
★ Record 24h final reading L1