Test procedure for HC-7L concrete gas content measuring instrument

I. Overview

HC-7L concrete gas content measuring instrument is a new generation testing instrument developed by Hebei Hongyu Instrument Equipment Co., Ltd., which measures the gas content in concrete mix. It is suitable for aggregate particle diameter not more than 40mm and gas content not more than 10%. , concrete with slump. Concrete gas content measuring instrument This machine has the advantages of simple operation, accurate measurement and intuitive reading. It is an advanced concrete mixture gas content measuring instrument. The measurement method of the concrete gas content measuring instrument conforms to the relevant provisions of GBJ80-85 (general concrete mixture performance test method) regarding the gas content test of concrete mixture.

Second, the technical parameters of concrete gas content measuring instrument

Volumetric volume: 7 liters (its inner diameter and depth are equal) gas content range: ≤ 10%, maximum particle size using coarse aggregate: ≤ 40mm

Third, the determination of gas content of concrete mix
1. Wipe the inner surface of the lid with a damp cloth and place the crucible horizontally.

2. Evenly mix the fresh concrete mix into the crucible, so that the concrete mixture is higher than the amount. When loading, you can use a crowbar to insert a little bit. After installation, when using a vibrating table (vibration table frequency 50HZ, amplitude 0.5±0.1mm when no-load), the vibration will be in real time. If the concrete mixture falls below the vibration process. At the mouth, you should add concrete mix at any time, vibrate until the concrete surface is flat, and stop vibrating when the glaze is present. Instead of using a vibrating table, the concrete mix is ​​replaced in real time. The concrete mix is ​​placed in three layers. After each layer is compacted, it is about one-third of the height of the stack. When the ground is inserted, the rod should pass through the entire depth. When inserting the upper layer, the crowbar should be inserted into the lower layer 10-20mm. After each layer is compacted, the crowbar can be placed in the lower part of the amount, and the amount can be alternately slammed on the ground 15 times.

3. After the time is finished, the scraper should be used to scrape off the excess concrete mixture on the surface. If there is any depression on the surface, it should be filled, then smoothed with a trowel, and the surface is smooth and free of bubbles.

4, wipe the amount of 钵 and the edge of the lid, put the O-shaped rubber sealing ring (238 × 8.6) in the groove at the edge of the lid, cover the lid, clamp with the clip, make it airtight, and use the level Check the level.

5. Open the faucet and the outlet valve, use the water injector to fill the water from the small faucet until the water flows out from the gas valve port, and then close the small faucet and the outlet valve.

6. Close all the valves and pressurize with a pump to make the gauge pressure slightly larger than 0.1MPA.

Note: 1. When reading the pressure, use the fingertip to flick the dial and wait for the pointer to stop swinging before reading.

2. The 0.1MPA pressure line is the initial pressure line of the instrument and 0.1MPA is the initial pressure of the instrument.

7. Press the valve stem 2-3 times, tap the circumference of the crucible with the raft, and distribute the pressure evenly throughout the sample. Press the valve stem again. After the pointer of the pressure gauge is stable, measure the pressure gauge. According to the calibration curve of the gas content and the pressure gauge reading, the instrument determines the gas content A value of the sample of the concrete mixture. After the test is completed, 1. Open the air outlet valve and prevent gas from the amount. If the gas content is to be repeatedly measured for the same sample, repeat steps 5-7 above. 2. Open the small faucet, send the clip open, and remove the sash cover. 3. Pour out the sample of the concrete mixture in the crucible and clean the inner surface of the crucible cover and the crucible. 4. If the gas content measuring instrument is not used continuously. The trim valve should be opened to deflate the chamber pressure to match the atmosphere.

Note: During operation, if the chamber pressure is exhausted through the trim valve, and there is pressure in the gauge, the valve stem must not be pressed. Otherwise, water will be sucked into the chamber, causing errors in subsequent tests.

4. Determination of concrete mixture of concrete gas content measuring instrument 1. Before measuring the gas content of concrete mixture, the gas content of aggregate should be measured first, and the measuring method is carried out according to the following steps.

1 Press to calculate the weight of the coarse and fine aggregates in each sample.

Where: WG, WS- are the weight of coarse and fine aggregate in each sample (KG) V-gas content measuring instrument measuring volume (liter) Gg, Cs- respectively, coarse in concrete per cubic meter, Fine aggregate dosage (kg)

2, the first three points of the amount of water, only a high degree of water, mix well-known coarse and fine aggregate, slowly poured into the amount of é’µ, when adding samples, should be brought into the air as little as possible, every rise in the water surface When 20-30mm, it should be gently inserted 10 times, and stirred a little, and tap the amount at any time to remove the air. During the feeding process, the top surface of the water surface is always kept high. After the aggregate is added, soak for another five minutes, and tap the wall of the body to remove the bubbles, then remove the water foam and add water to the full.

3, wipe the amount of 钵 and the edge of the lid, put the O-shaped rubber sealing ring (230 × 8.6) in the groove at the edge of the lid, cover the lid, clamp with the clip, make it airtight, and use the level Check the level.
The remaining steps are based on the relevant provisions of the determination of the gas content of the concrete mixture, and the gas content C of the grade aggregate is measured.

V. Calculation of test results of concrete gas content measuring instrument

The gas content is calculated as follows: A=A1-C
Among them: A-concrete mixture quantity (%) A1-instrument determination gas content (%) C-aggregate gas content (%)

The average of the two measurements was used as the test result. If the difference between the two gas content measurements is more than 0.2%, the cause redo test must be found.

　 6. Calibration of the gas content of the concrete meter. The instrument is accurately calibrated before leaving the factory. The calibration result is provided, but it is recalibrated from time to time to ensure the accuracy of the gas content of the concrete mixture. It is also feasible. . Calibration includes the following 3 steps:

　　 1. Calibration of measuring volume

a, prepare a flat glass plate, weigh it together with the empty amount of W (accurate to 0.05kg);

b. Fill the container with water and slide it along the upper edge with a glass plate. Add water from the water injector from time to time, so that the amount of water is filled with water and there is no air bubble under the glass plate. The amount of water filled with glass is called together with the glass plate. In the middle

The volume W1 (accurate to 0.05kg) is the volume of the volume V:
W=W1-W2 (W, W1, W2-kg)
V=W1-W2 (W, W1, W2-kg)
V=W/r (VL)
R- Specific gravity of water at nominal temperature (r-kg/L)
2. Calibration of 0% gas content.
a. Fill the measuring bowl with water and connect the calibration tube 2 to the end of the small faucet under the lid.
b. Open the small faucet, place the sash cover on the measuring shovel, clamp it with a clamp, and check the level of the instrument with a spirit level.
C. Send out the air outlet valve, use water injector to add water from the small faucet until the outlet valve outlet water, then close the small faucet and outlet valve.
Note: The space under the lid must be completely filled with water, otherwise the reading will not reflect the correct gas content.
d. Pressurize and pressurize with a pump to make the gauge pressure slightly exceed 0.1MPA. After stopping for 5 seconds, adjust the pressure with the trimmer valve to make the gauge pressure stop at 0.1MPA, tap the dial, and the gauge pressure is still 0.1MPA. Then press the valve stem 2-3 times to balance the pressure between the chamber and the pressure. The reading pressure gauge is equivalent to 0% of the gas content.

3. After calibration of the gas content of the calibration instrument with a gas content of 1%-10%, the calibration tube 1 is connected to the upper end of the faucet, and the water is sucked into the cylinder through the calibration tube. The specific operation method is as follows:

a. Press the valve stem and slowly open the small faucet. The water in the measuring cymbal flows through the calibration tube 1 into the measuring cylinder. If the water flow is not smooth, close the small faucet first.

b. Open the air outlet valve to balance the pressure in the measuring bowl with the atmospheric pressure. Then close the air outlet valve and pressurize with the pump to make the gauge pressure slightly exceed 0.1MPA and stop for 5 seconds.

C. Use the micro-regulation valve to adjust the pressure so that the gauge pressure stops at 0.1MPA accurately, stop for 5 seconds, press the valve stem 2-3 times, after the pointer is stable, the pressure value read at this time is equivalent to the gas content 1 %, the same method measured 2%, 3%, 4%, ... 10% of the pressure gauge reading.
d. Strictly calibrate 2 times in the calibration order, and obtain 0%, 1%, .10% of the pressure gauge readings of the gas content points, and the corresponding two readings, take their arithmetic mean. Taking the pressure average as the abscissa and the gas content as the ordinate, the relationship between the gas content and the pressure value should be in accordance with the glass law (p1v1=p2v2). If significant deviation is found, the cause should be found and recalibrated. After a certain period of time, the product structure may be modified for some reason. After the improvement, it may be slightly different from this manual without prior notice.

Angle Grinder, angle grinder), also called grinding machine or plate mill, is used for glass fiber reinforced plastic cutting and grinding of a grinding tool. Angle grinder is a use of glass fiber reinforced plastic portable electric tools for cutting and polishing, brush is mainly used for cutting, grinding and grinding metal and stone, etc.

Angle grinder common model according to the use of attachment specification is divided into 100 millimeters (4 inches), 125 mm (5 inches), 150 mm (6 inches), 180 mm (7 inches) and 230 mm (9 inches), Europe and the United States use of small specifications more grinder is 115 mm. Angle classification compact mill grinder and large Angle grinder, compact Angle grinder, super light, with or without security configuration, meet the requirements of the diagonal mill; Big Angle grinder: difficult power strong, suitable for grinding and cutting operations. According to different grinding diameter and the applicable scope, compact Angle of grinding machine is divided into: WSB10-115 - t,, WSG10-125 - s, WSB14 WSG10-115-125 - t, WSG14-125, WSG14-125 - s, e, WSS14 WSG14-70-70,, WSG14 MSFV649-1-150. According to different grinding diameter and the applicable scope, compact Angle of grinding machine is divided into:, WSG25 WSG20-180-180, WSB20-180, WSB25-180 - x,, WSB20 WSG20-230-230, WSG25-230, WSB25-30 x

Use a lot of, carpenter, bricklayer's welders are used to. Installed on woodworking saw blade is a smart mobile woodworking saws, can deal with simple woodworking, a lot of installation of the floor master with it. Installed on the grinding wheel is a small portable grinding wheel cutter, cutting grinding small metal parts, metal processing such as stainless steel window and light boxes are made without it. Wouldn't it or make stone processing installation, can be installed marble cutting wheel, and a series of films, crystal, flowing wool, cutting, grinding, polishing all depends on it! To be sure, grinder design is used for grinding, sawing, cutting function is not the intent of the designer. Because of the high Angle grinder speed, the use of saw blade, cutting were not forcibly pressure, can't cut more than 20 mm thick hard material, otherwise once the card is dead, will cause the saw blade, cutting piece broken splash, bounce off or machine is out of control, light damage to the goods, or hurt! Please select above 40 teeth.

Angle Grinder

electric angle grinder, angle grinder, grinder

ZHE JIANG ULITE TOOLS MANUFACTURE CO.,LTD , http://www.ulitepowertool.com