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CBR承载比试验仪

CBR承载比试验仪适用于各种土和混合料(粒径小于40mm的土)在规定的试筒模内压实后进行承载比试验,以确定所设计的路面、路面基层,底基层,路基材料层的承载能力,仪器由主机、量力环及贯入杆、加栽板、百分表、膨胀量测定装置等组成。仪器具有体积小,出力大,操作方便等特点。 

The CBR load ratio tester is suitable for various soils and mixtures (soils with a particle size of less than 40mm) to carry out the load ratio test after compacting in the specified cylinder mold to determine the designed road surface, pavement base layer, subbase layer, and subgrade The bearing capacity of the material layer, the instrument consists of the host, the force ring and the penetrating rod, the planting plate, the dial indicator, the expansion measuring device and so on. The instrument has the characteristics of small size, large output and easy operation.


CBR承载比试验仪主要参数: 

★速度:1mm/min 大压力3T

★贯入杆:端面直径φ50mm。内径φ52mm 长100mm

★多孔板:两块

★百分表:0~10mm,三只φ

★载荷板:6块(外径φ150mm,内径φ52mm,每块1.25Kg).

★试筒:内径φ125mm,高170mm,垫块φ151mm,高50mm同重型击实试验试筒。

★外形尺寸:310X310X930mm

★重量:100kg

CBR load ratio tester main parameters:

★ speed: 1mm / min much pressure 3T

★ penetration rod: end face diameter φ50mm. Long 100mm inside diameter φ52mm

★ Multi-well plate: two pieces

★ Dial indicator: 0 ~ 10mm, three φ

★ Load board: 6 (outer diameter φ150mm, inner diameter φ52mm, each 1.25Kg).

★ Cylinder: inner diameter φ125mm, height 170mm, spacer φ151mm, height 50mm. Same as heavy-duty compaction test cylinder.

★ Dimensions: 310X310X930mm

★ Weight: 100kg


CBR承载比试验仪使用方法:

★打开电源开关,仪器运转,检查仪器的工作状况是否正常,检查手柄进出,转动是否正常,如一切正常可准备开始试验。

★按《公路路面基层材料试验规程》JTJ075-85承载比试验方法制取试件。

★测量饱水膨胀量:

★测量饱水膨胀量:将经过湿气养生的试件放在装有调节杆的多孔板,在板上加足够的载荷板,使试件面上的压力等于该材料层上路面的压力,

★将试筒与多孔板一起放在水槽内(先不放水)并用拉杆将模具拉紧,安装百分表,读取初始读数。

★向水槽内放水,使自由进到试件的顶部,在饱水期间,槽内水应保持在试件的顶面以上25mm,通常试件要泡96小时,

★在泡水时间到时,读取百分表读数,计算膨胀量。

=泡水后试件高度的变化/原试件高(120mm)×**

★从水槽中取出试样,倒出试样上的水,静置15分钟让其排水然后卸去附加载荷和多孔板,底板及滤纸,并承重M,以计算试件的深度及密度的变化。

★贯入试验:将饱和水试验终了的试件放到试验仪升降盘上,调整贯入杆与测力环对中,在贯入杆周围放置预定数量的载荷板。

★先将贯入杆用手轮施加45N载荷,然后将测力环,测形变的百分表调整到零点。

★加荷压人手轮,记录测力百分表某些读数(20、40…..)时的贯入量,并注意贯入量为2.5mm,能有8各以上的读数,总贯入量为2.5、50mm时的承载比:

承载比C=单位压力/7或10.5×**

Bearing ratio CBR tester using the method:

★ Turn on the power switch, the instrument is running, check whether the instrument is working normally, check whether the handle is in and out, and whether the rotation is normal. If everything is normal, you can prepare to start the test.

Press ★ "Base material testing procedures Pavement" JTJ075-85 carrier ratio test specimens taken methods.

★ Measure the amount of water-swelling:

Saturated ★ measuring the amount of expansion: After the test piece was placed with health moisture adjusting lever perforated plate, the plate plus sufficient load plate, the pressure surface of the test piece is equal to the pressure on the material layer of the road surface,

★ Put the test tube with the perforated plate in the water tank (without water first) and tighten the mold with the pull rod, install the dial indicator, and read the initial reading.

★ Put water into the water tank, so that it can freely enter the top of the test piece. During the saturation period, the water in the tank should be kept 25mm above the top surface of the test piece. Usually, the test piece should be soaked for 96 hours.

★ When the soaking time is up, read the dial indicator and calculate the expansion.

= Change of test piece height after soaking water / original test piece height (120mm) × **

★ Remove the sample from the water tank, pour out the water on the sample, let it stand for 15 minutes to allow it to drain, then remove the additional load and the perforated plate, the bottom plate and the filter paper, and load M to calculate the depth and density change of the test piece. .

★ Penetration test: Place the test piece after the saturated water test on the tester lifting plate, adjust the penetrating rod and the force measuring ring, and place a predetermined number of load plates around the penetrating rod.

★ Apply a 45N load to the penetrating lever with the hand wheel, and then adjust the force gauge and the deformation indicator to zero.

★ Press the human handwheel, record the penetration of some readings (20, 40… ..) of the dial indicator, and pay attention to the penetration of 2.5mm, which can have more than 8 readings, total penetration Load ratio when the amount is 2.5, 50mm:

Load ratio C = Unit pressure / 7 or 10.5 × **


CBR承载比试验仪保养:

1、每次使用后,应立即将仪器擦干净。

2、使用一年后应把变速箱内润滑油脂换上新的润滑油脂,一会定期保养。

Bearing ratio CBR Tester Maintenance:

1, after each use, immediately clean the instrument.

2, one year after the gearbox grease should be replaced with a new grease for a regular maintenance.


CBR承载比试验仪
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