Introduction: The CBR load-bearing ratio tester is suitable for carrying out load-bearing ratio tests after compaction of various soils and mixtures (soil with a particle size of less than 40mm) in the prescribed test cylinder mold to determine the designed pavement, pavement base, subbase and roadbed The load-bearing capacity of the material layer, the instrument consists of the main machine, the measuring ring and the penetrating rod, the adding plate, the dial indicator, and the expansion measuring device. The instrument has the characteristics of small size, large output and convenient operation. Technical Parameters: Speed: 1mm/min, high pressure 3T Penetrating rod: end diameter φ50mm. Inner diameter φ52mm length 100mm Perforated plate: two Dial indicator: 0~10mm, three φ Load plate: 6 pieces (outer diameter φ150mm, inner diameter φ52mm, 1.25Kg each). Test tube: inner diameter φ125mm, height 170mm, cushion block φ151mm, height 50mm, same as heavy-duty compaction test tube. Dimensions: 310X310X930mm Weight: 100kg Instructions: 1. Turn on the power switch, the instrument is running, check whether the working condition of the instrument is normal, check whether the handle enters and exits, and the rotation is normal. If everything is normal, you can prepare to start the test. 2. According to "Highway Pavement Base Material Test Regulations" JTJ075-85 bearing ratio test method to prepare specimens. 3. Measure the amount of water-swelling: 4. Measure the amount of saturated water expansion: place the specimen after moisture curing on a perforated plate equipped with an adjusting rod, and add enough load plates on the plate to make the pressure on the specimen surface equal to the pressure on the road surface on the material layer , 5. Put the test tube and the perforated plate in the sink (without putting water first) and use the pull rod to tighten the mold, install the dial indicator, and read the initial reading. 6. Pour water into the water tank so that it can enter the top of the test piece freely. During the period of full water, the water in the tank should be kept 25mm above the top surface of the test piece. Usually the test piece needs to be soaked for 96 hours. 7. When the soaking time is up, read the dial indicator and calculate the expansion. = Change of specimen height after soaking in water / original specimen height (120mm) ×** 8. Take out the sample from the sink, pour out the water on the sample, let it stand for 15 minutes to let it drain, then remove the additional load and perforated plate, bottom plate and filter paper, and load M to calculate the depth and density of the sample Variety. 9. Penetration test: Place the test piece after the saturated water test on the lifting plate of the tester, adjust the center of the penetration rod and the force measuring ring, and place a predetermined number of load plates around the penetration rod. 10. First apply a 45N load on the penetrating rod with the handwheel, and then adjust the force measuring ring and the dial gauge for measuring deformation to zero. 11. Apply load to the hand wheel, record the penetration of certain readings (20, 40.....) of the force gauge, and note that the penetration is 2.5mm, and there can be more than 8 readings, total penetration Load ratio when the input volume is 2.5, 50mm:
Introduction: The CBR load-bearing ratio tester is suitable for carrying out load-bearing ratio tests after compaction of various soils and mixtures (soil with a particle size of less than 40mm) in the prescribed test cylinder mold to determine the designed pavement, pavement base, subbase and roadbed The load-bearing capacity of the material layer, the instrument consists of the main machine, the measuring ring and the penetrating rod, the adding plate, the dial indicator, and the expansion measuring device. The instrument has the characteristics of small size, large output and convenient operation.
