Inorganic binder splitting rebound modulus test device for stable materials

1、 Product Overview

Inorganic binder splitting rebound modulus test device for stable materialsThe rebound modulus test fixture product complies with the requirements of the T0852 inorganic binder stabilized material splitting rebound modulus test method in the JTGE51 highway engineering inorganic binder stabilized material test regulations. Axial load cutting is applied to cylindrical specimens through the fixture to measure the axial elastic deformation of the specimens under load changes, thereby calculating the splitting rebound modulus of the material.

2、 Technical parameters

Product Name: Inorganic Bonding Material Splitting Rebound Modulus Test Fixture

Test piece size: 50x50MM, 100x100MM, 150x150MM

Width of pressure strip: 6.35MM, 12.7mm, 18.75mm

Arc radius: 25MM, 50MM, 75MM

3、 Preparation and maintenance of test specimens:

1. For fine-grained and medium grained mixtures, cylindrical specimens with a diameter of 100 * 100 are used; For coarse-grained mixtures, cylindrical specimens with a diameter of 150 * 150 are used, and the test load is a static load.

2. Determine the maximum moisture content and maximum dry density of inorganic binder stabilized materials according to regulations.

3. Number of specimens: For fine-grained soil, no less than 9 specimens should be prepared, and the coefficient of variation of modulus test results should not exceed 10%; At least 15 specimens should be prepared for medium grained soil, and the coefficient of variation of modulus test results should not exceed 10%; At least 19 specimens should be prepared for coarse-grained soil, and the coefficient of variation of modulus test results should not exceed 15%

4. According to the standard health preservation methods, the health preservation period for cement stabilized soil is 90 days, and for lime or fly ash stabilized soil it is 180 days.

4Inorganic binder splitting rebound modulus test device for stable materialsTest steps

1. Based on the type of test material and general engineering experience, select a suitable range of load cell and testing machine, and apply a load greater than 20% of the range and less than 80% of the range. Apply engine oil to the spherical support and upper and lower pressure strips to enable the spherical support to rotate flexibly. 2. Take out the specimen that has been immersed in water for a day and night, use a soft cloth to absorb the moisture on the surface of the specimen, and weigh the mass of the specimen. 3. Test of specimen height; Measure the height of four equal points along the circumference with a vernier caliper, accurate to 0.1mm. Take the average value and draw a cross mark on both sides of the specimen through the center of the circle.

4. Place the specimen between the upper and lower pressure strips of the test bench fixture, align the upper pressure strip with the cross drawn line on the side, and ensure that the upper and lower pressure strips are centered.

5. Determine the degree of splitting of the mixture according to the specifications as the failure load P for the splitting rebound modulus test

6. Place a dial gauge at equal distances on both sides of the specimen.

7. Preloading: First, conduct two loading and unloading preloading tests using half of the maximum load to be applied, so that the loading top plate is in close contact with the surface of the specimen. After each uninstallation, wait for 1 minute, adjust the short pointer of the dial gauge to the middle position, and adjust the long pointer to 0. Record the original reading of the dial gauge.

8. Rebound deformation measurement: Divide the predetermined unit pressure into 5-6 equal parts as the pressure value applied each time. The set maximum pressure value should not exceed 0.6-0.7 times the failure load, and the actual applied load should be increased by 1 level compared to the predetermined level. Apply a level 1 load (such as 1/5 of the predetermined maximum load), wait for the load to act for 1 minute, record the reading on the dial gauge, and remove the load to allow the elastic deformation of the specimen to recover. Record the reading of the dial gauge at 0.5 minutes, apply the second level load (2/5 of the predetermined maximum load), as before, wait for the load to act for 1 minute, record the reading of the dial gauge, and remove the load. After unloading for 0.5 minutes, record the reading of the dial gauge and apply the third level load. Repeat this step by step until the rebound deformation under the next level of load is recorded.