CN201716253U - Device for measuring effective porosity of permeable concrete - Google Patents

Abstract

The utility model provides a device for measuring the effective porosity of permeable concrete, which belongs to a transparent rectangular metering tube. The net dimension after the length and the width of the cross section of the metering tube deduct the wall thickness is 270mm*250mm, the height is greater than 200mm, scales capable of being directly read the effective porosity are marked on the side surface of the metering tube, and the range of the scales is between 0 and 100 percent. The device for measuring the effective porosity of the permeable concrete realized by the utility model has the characteristics of simple structure, short realized test period, convenient operation, high speed, capability of directly reading the results, high measuring precision and the like.

Description

A kind of device of measuring the pervious concrete effective drainage porosity

[technical field]

The utility model relates to a kind of pick-up unit of pervious concrete porosity, particularly a kind of device of measuring the pervious concrete effective drainage porosity.

[background technology]

The hole of pervious concrete is meant the remainder behind the shared volume of concrete cumulative volume deduction solid skeletal, and it is made up of open pore, semi-connected hole and storage pore three parts.Open pore and semi-connected hole are owing to making water pass through, get rid of or store, so be called active porosity.And the storage pore current can not enter wherein, correspondingly are called invalid hole, and therefore, effective drainage porosity is meant that the active porosity volume accounts for the number percent of compound cumulative volume.For pervious concrete, only guaranteed certain effective drainage porosity just can be guaranteed functions such as its draining, infiltration.In the pervious concrete structure Design, with effective drainage porosity as one of them controlling index.

The method that tradition is measured the material porosity has three classes, i.e. air pressure hydrometer method, suction method and unit weight scaling method.Such as boiling the suction method, be that first weighing bottle is heavy and sample is heavy, add quantitative distilled water, boiling was boiled one hour then, cool to room temperature, adding distil water obtains true specific gravity to former scale, calculates porosity then.Above the whole bag of tricks is long owing to measuring period, and the method for operating complexity, can't satisfy the needs that real-time information is obtained.

[utility model content]

The technical problems to be solved in the utility model, be to provide a kind of fast, the measurement mechanism of harmless, high-precision pervious concrete effective drainage porosity, the problem that the measuring period that can solve the measuring method that exists in the prior art is long, can't obtain information in real time.

The utility model is by solving the problems of the technologies described above by the following technical solutions: a kind of device of measuring the pervious concrete effective drainage porosity, wherein, described device is a transparent rectangle metering cylinder, the dead size of the xsect length and width deduction wall thickness of described metering cylinder is 270mm * 250mm, height is greater than 200mm, be marked with the scale value of direct reading effective drainage porosity at the lateral marks of described metering cylinder, described scale value scope is 0-100%.

Further, the side of described metering cylinder also marks the scale value that height of water level changes, and this scale value scope is 0-50mm, and this scale value is corresponding with the scale value of described effective drainage porosity.

Further, the height of reference position from the bottom of metering cylinder of the scale mark of the side of described metering cylinder mark is not less than 150mm.

Further, the test specimen specification of the measurable pervious concrete of described device is 150mm * 150mm * 150mm.

A kind of device of measuring the pervious concrete effective drainage porosity that the utility model is realized has following advantage: this measurement mechanism simple structure, implement easily to make, the test period of being realized is short, test operation is convenient, speed is fast, test result can directly read, need not troublesome calculation, and measuring accuracy can satisfy the requirement of cement pervious concrete fully.

[description of drawings]

In conjunction with specific embodiments the utility model is further described with reference to the accompanying drawings.

Fig. 1 is the structural representation of metering cylinder described in the utility model.

Fig. 2 is the initial water level synoptic diagram of metering cylinder described in the utility model.

Fig. 3 is the fixed level synoptic diagram of metering cylinder described in the utility model after putting into test specimen.

[embodiment]

Shown in Fig. 1-3, a kind of device of measuring the pervious concrete effective drainage porosity that the utility model is related, described device is a transparent rectangle metering cylinder 1, the dead size of the xsect length and width deduction wall thickness of described metering cylinder is 270mm * 250mm, height is greater than 200mm, be marked with the read text scale value 11 of the effective drainage porosity that can directly read at the lateral marks of described metering cylinder, the scale value scope is 0-100%.The side of described metering cylinder also marks the scale value 12 that height of water level changes, this scale value scope is 0-50mm, it is 11 corresponding that this scale value 12 and the read text scale of described effective drainage porosity are worth, such as, when height of water level was 0mm, corresponding effective drainage porosity was 100%, when height of water level is 30mm, corresponding effective drainage porosity is 40%, and when height of water level was 50mm, corresponding effective drainage porosity was 0%.The height of reference position from the bottom of metering cylinder of the scale mark of the side mark of described metering cylinder is not less than 150mm.The test specimen specification of the measurable pervious concrete of described device is 150mm * 150mm * 150mm.

The measuring method and the principle of work of a kind of device of measuring the pervious concrete effective drainage porosity described in the utility model are as follows: during test, in metering cylinder, pour earlier water into, make water level reach the 0mm scale value, (specification of test specimen is that 150mm * 150mm * 150mm) puts into metering cylinder with the test specimen of drying then, after treating stable level (no bubble occurs), read height of water level added value Δ, then the relation such as the formula (1) of effective drainage porosity size and height of water level changing value Δ:

$P=1-\frac{\mathrm{S\Δ}}{A\·h}=1-\frac{67500\·\mathrm{\Δ}}{150\×150\×150}=1-0.02\×\mathrm{\Δ}---\left(1\right)$

P in the formula---effective drainage porosity (%);

S---meter graduated cylinder area, i.e. 270mm * 250mm=67500mm ²

A---test specimen floorage to be measured, i.e. 150mm * 150mm;

H---test specimen height to be measured, i.e. 150mm;

The height of water level that Δ---test specimen to be measured is put into after the water middle water level is stablized changes added value (mm).

Then as can be known according to above-mentioned formula (1), effective drainage porosity size P and the linear inverse relation of SEA LEVEL VARIATION height change value Δ, after test specimen was put into graduated cylinder, when effective porosity was 0%, then the height of water level changing value was Δ=50mm; When the height of water level changing value is Δ=1mm, then effective drainage porosity is 98%, and the effective drainage porosity size is varied to linear inverse relation with height of water level.According to this linear inverse relation, the big or small of effective drainage porosity directly marked at the height of water level value place of graduated cylinder.After test specimen is put into graduated cylinder, directly read effective drainage porosity according to the SEA LEVEL VARIATION height, precision can reach 2%, and reading can be estimated and reads 0.2%.

The concrete testing procedure of a kind of device of measuring the pervious concrete effective drainage porosity described in the utility model is as described below:

1, at first preparation size is 3 of the pervious concrete test specimens to be measured of 150mm * 150mm * 150mm, supports indoor maintenance to the length of time at mark, and the preparation of test specimen should meet the regulation in " forming method of pervious concrete compressive strength test specimen ";

2, test specimen to be measured is put into 105 ± 5 ℃ dryer and dried to constant weight, take out to be placed on and be cooled to room temperature in the exsiccator;

3, metering cylinder is placed level, in metering cylinder, pour water into, make water level reach the 0mm scale value, as shown in Figure 2;

4, pervious concrete test specimen to be measured is put into metering cylinder, treat stable level after (no bubble occurs) directly read effective drainage porosity, as shown in Figure 3, the effective drainage porosity of cement pervious concrete test specimen then to be measured is 12%;

5, test the effective drainage porosity of every group of test specimen by above step, average, test result be accurate to 1%, three in the test value maximal value or minimum value in surpass 20% of intermediate value if any one with the difference of intermediate value, then getting intermediate value is measured value; Difference as maximal value and minimum value and intermediate value all surpasses 20% of intermediate value, and it is invalid then should to organize test result.

Claims (4)

1. device of measuring the pervious concrete effective drainage porosity, it is characterized in that: described device is a transparent rectangle metering cylinder, the dead size of the xsect length and width deduction wall thickness of described metering cylinder is 270mm * 250mm, height is greater than 200mm, be marked with the scale value of direct reading effective drainage porosity at the lateral marks of described metering cylinder, described scale value scope is 0-100%.

2. a kind of device of measuring the pervious concrete effective drainage porosity according to claim 1, it is characterized in that: the side of described metering cylinder also marks the scale value that height of water level changes, this scale value scope is 0-50mm, and this scale value is corresponding with the scale value of described effective drainage porosity.

3. a kind of device of measuring the pervious concrete effective drainage porosity according to claim 1 is characterized in that: the height of reference position from the bottom of metering cylinder of the scale mark of the side mark of described metering cylinder is not less than 150mm.

4. a kind of device of measuring the pervious concrete effective drainage porosity according to claim 1 is characterized in that: the test specimen specification of the measurable pervious concrete of described device is 150mm * 150mm * 150mm.

Images