Experimental procedure for vertical expansion rate of expanded mortar for grouting - Master's thesis - Dissertation

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Grouting vertical expansion rate tester

1. Introduction to the vertical expansion rate measuring instrument for expanding mortar for grouting:

The vertical expansion rate of concrete expansion mortar is based on the national standard

GB50119-2003

This product is applicable to ordinary water reducing agent, high efficiency water reducing agent, air entraining agent, air entraining water reducing agent, retarder, retarding water reducing agent, retarding high efficiency water reducing agent, early strength. Application of fourteen admixtures such as agent, early strength water reducer, antifreeze, expansion agent, pumping agent, waterproofing agent and quick-setting agent in concrete engineering. This experimental method is suitable for vertical expansion of expanding mortar for grouting. Determination of the rate.

Second, test methods and steps:

1

The water consumption of the grout is based on the fluidity

250±10min

Water consumption;

2

Fill the slurry with water and stir evenly. Fill in from one side of the glass plate. When poured

At the left and right heights, insert the raft on each side of the test dies

6

Times, the middle part is also inserted

6

Times. Fill in

At the height, do the same as before, and try to exclude the gas. The last layer of grouting should be poured once to the side of the grout. It is necessary to minimize the upward flushing effect of the grout on the glass plate;

3

The surface of the glass plate is filled with slurry, and gently smeared with a knife to form a slope. The high side of the slope is level with the glass. The bottom edge of the slope is level with the inner top surface of the test mold. The time to wipe the slope should not exceed

30S

. Molding temperature and curing temperature are (

20±3

)

°C

;

4

After finishing the slope, place the dial indicator on the glass plate.

30S

Record the dial gauges. For the initial reading.

5

After measuring the initial reading

30S

Inside, the surface of the grouting material on both sides of the glass plate is covered with two layers of wet cotton cloth;

6

From the initial reading, every

2h

Watering

1

Times. Continuous watering

4

Times. Every time thereafter

4h

Watering

1

Times. Moisturizing and curing until the required age, determination

3d

,

7d

Test piece height reading;

7

Starting from the measurement of the initial reading, the measuring device and the test piece should remain stationary and free from vibration.