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LST-II沥青混凝土渗透试验仪

沥青混凝土渗透仪是**检测仪器,符合电力部水工沥青混凝土试验规程DL/T5326-2006的要求,用于测定沥青混凝土的渗透系数。沥青混凝土渗透仪符合DL/T5362-2006水工沥青混凝土试验规程测定沥青混凝土的渗透系数。常用水头试验适用于渗透系数较大的试件,变水头试验适用于试件较小的试件。

  • 型号: LST-II

  • 产品参数
  • 型号: LST-II

 

 


 

沥青混凝土渗透仪**检测仪器,符合电力部水工沥青混凝土试验规程DL/T5326-2006的要求,用于测定沥青混凝土的渗透系数。沥青混凝土渗透仪符合DL/T5362-2006水工沥青混凝土试验规程测定沥青混凝土的渗透系数。常用水头试验适用于渗透系数较大的试件,变水头试验适用于试件较小的试件。

Asphalt concrete permeation meter is a testing instrument that meets the requirements of the Ministry of Electric Power's hydraulic asphalt concrete test regulations DL / T5326-2006, and is used to determine the permeability coefficient of asphalt concrete. The asphalt concrete permeation meter conforms to DL / T5362-2006 hydraulic asphalt concrete test procedures to determine the permeability coefficient of asphalt concrete. The common water head test is suitable for test pieces with large permeability coefficients, and the variable water head test is suitable for test pieces with smaller test pieces.

 

二、沥青混凝土渗透仪技术参数:

■试验规格:¢101.6mm,  厚63.5mm

■电源电压:220v  50HZ

■外形尺寸:600×750×1900mm

■整机重量:150Kg

 Technical parameters of asphalt concrete infiltration meter:

■ Test specification: ¢ 101.6mm, thickness 63.5mm

■ Power supply voltage: 220v 50HZ

■ Dimensions: 600 × 750 × 1900mm

■ Machine weight: 150Kg

三、沥青混凝土渗透操作规程

■按规定制备沥青混合料,按规定成型马歇尔试件。如采用芯样进行试验,用切割机将芯样上下两头切平,测量试件的平均高度和直径。

■将渗透试模的上盖卸下,将试件放入试模中间,清理试件表面,除去油污、粉尘等,避免试件周边与沥青结合不好而渗水,灌入热沥青密封试模与试件周边的缝隙。灌缝时应避免热沥青污染试件表面及沥青外留。待沥青冷至室温后,装好上盖,拧紧螺栓。渗透试件装模后,应加以检查,确认试模密封良好、管道通畅。

■ 试验应采用蒸馏水或经过滤的清水,试验前用抽气法或煮沸法进行排气。试验时水温宜高于室温3℃~4℃.试验开始前应备够一次试验所需的水。

■将渗透试模安装在渗透试验装置上。安装时,关闭全部阀门,防止水流入渗透试模内。

■打开阀门 ③、⑥ ,开动抽气机进行抽气,至抽气瓶内无气泡排除。关闭阀门 ⑥ ,打开阀门④,使试件从上下两端充水饱和,关闭阀门④,打开阀门⑥,进行抽气,至抽气瓶内无气泡排出时,关闭阀门⑥,打开阀门④,使试件充水饱和。如此反复进行,至气泡完全排除。饱和排水结束后,将全部阀门关闭。

■先打开阀门①、④,使进水口测压管水位达到一定水平后关闭阀门④,分别记录进水口和出水口测压管的水位,同时开动秒表计时,经时间t后,在记录两测压管相应的水位 。如此反复试验三次~四次后,在打开阀门 ④ ,使进水测压管水位重新上升后,再重复进行测试。记录试验开始和结束时的水温。每次试验的水头应不小于50mm,并应在3h~4h内完成。如两次试验结果出现较大偏差时,应在试验前重新抽气饱水,在进行试验。

 Third, the asphalt concrete infiltration instrument operating procedures:

■ Asphalt mixture is prepared according to regulations, and Marshall test pieces are formed according to regulations. If the core sample is used for the test, the upper and lower ends of the core sample are cut flat with a cutting machine, and the average height and diameter of the test piece are measured.

■ Remove the upper cover of the penetration test mold, put the test piece in the middle of the test mold, clean the surface of the test piece, remove oil stains, dust, etc., to prevent the surrounding of the test piece from being badly bonded to the asphalt and leak water, and fill the hot asphalt to seal the test mold With the gap around the test piece. When filling joints, avoid hot asphalt contaminating the surface of the test piece and leaving the asphalt outside. After the asphalt has cooled to room temperature, install the cover and tighten the bolts. After the penetration test piece is installed, it should be inspected to confirm that the test mold is well sealed and the pipeline is unobstructed.

■ The test should use distilled water or filtered water, and use the exhaust method or the boiling method to evacuate before the test. The water temperature during the test should be 3 ℃ ~ 4 ℃ higher than the room temperature. Before the test, sufficient water for one test should be prepared.

■ Install the penetration test mold on the penetration test device. During installation, close all valves to prevent water from flowing into the penetration test mold.

■ Open the valve ③, ⑥ and start the air extractor to evacuate until there are no bubbles in the air extractor. Close the valve ⑥ and open the valve ④ to saturate the test piece with water from the upper and lower ends. Close the valve ④ and open the valve ⑥ to perform air extraction. When no air bubbles are discharged from the pump cylinder, close the valve ⑥ and open the valve ④. The test piece was saturated with water. This was repeated until the bubbles were completely eliminated. After the saturated drainage is completed, all valves are closed.

■ Open the valves ① and ④ first, and then close the valve ④ after the water level of the pressure measuring pipe at the water inlet reaches a certain level. Record the water levels of the pressure measuring pipe at the water inlet and the water outlet separately, and start the stopwatch at the same time. The corresponding water level of the pressure pipe. After repeating the test three to four times in this way, the test is repeated after the valve ④ is opened and the water level of the inlet pressure measuring pipe is raised again. Record the water temperature at the beginning and end of the test. The head of each test shall not be less than 50mm, and shall be completed within 3h to 4h. If there is a large deviation in the results of the two tests, the air should be pumped and saturated before the test, and the test should be carried out.

 

沥青混凝土渗透仪试验结果:

■    Kt=(QL/At)x IN x(△h1/△h2)   (9.8 4-1)

式中:

 a_____测压管截面积,cm2;

h1____ 时段t开始时进水测压管和出水测压管的水位差,㎝;

h2____时段t结束时进水测压管和出水测压管的水位差,㎝。

■按图所示的渗透试验装置进行试验,常水头试验的渗透系数按式计算:

Kt=QL/AHt     (9.8  4-2)

式中:

H_____水头,㎝。

■单个试件几次测试算出的渗透系数,取平均值作为该试件的渗透系数。应平行测定3个~5个试件,渗透系数小于1.0x10㎝/S时,给出渗透系数的范围;渗透系数大于等于1.0x1.0㎝/S时,取其平均值。

■Kt可按式换算为K20:

                     K20=Kt X(nr/n20)    ( 9.8  4-3)

式中:

K20______温度20℃时渗透系数,㎝/s;

nr_______温度T℃时水的动力黏滞系数,Pa .s;

n20_______温度20℃时水的动力黏滞系数,Pa .s;

nr/N20______可按9.8.3公式查得。

 4. Test results of asphalt concrete infiltration meter:

■ Kt = (QL / At) x IN x (△ h1 / △ h2) (9.8 4-1)

In the formula:

_A_____ Cross-sectional area of pressure measuring tube, cm2;

h1____ The water level difference between the inlet pressure measuring tube and the outlet pressure measuring tube at the beginning of the period t, ㎝

At the end of h2____ period t, the water level difference between the inlet pressure measuring tube and the outlet pressure measuring tube, ㎝.

■ Perform the test according to the penetration test device shown in the figure, and the permeability coefficient of the normal head test is calculated according to the formula:

Kt = QL / AHt (9.8 4-2)

In the formula:

H_____ Water head, eh.

■ The permeability coefficient calculated from several tests of a single specimen, and the average value is taken as the permeability coefficient of the specimen. Three to five test pieces shall be measured in parallel. The range of permeability coefficient is given when the permeability coefficient is less than 1.0x10㎝ / S; when the permeability coefficient is 1.0x1.0㎝ / S or more, the average value is taken.

Kt can be converted to K20 according to the formula:

K20 = Kt X (nr / n20) (9.8 4-3)

In the formula:

K20______ Permeability coefficient at 20 ℃, ㎝ / s;

nr_______ Dynamic viscosity coefficient of water at temperature T ℃, Pa .s;

n20_______ Dynamic viscosity coefficient of water at 20 ℃, Pa .s;

nr / N20 ______ can be found by formula 9.8.3.

 

五、沥青混凝土渗透仪水的动力黏滞系数、黏滞系数比、温度校正系数

 

             

LSY-2 示意图:

1、储水瓶            5、接水管      9、指示灯

2、进水测压管        6、抽气瓶      10、进水管

3、出水测压管        7、放水阀      11、出水管

4、装好试件的试模    8、抽气开关①②③④⑤⑥阀门

 

 


LST-II沥青混凝土渗透试验仪

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