土基回弹模量测定仪是 检测仪器。适用于在室内对细颗粒土或粒径20㎜以下的级配集料试件进行回弹模量测定。试件在一定载荷的作用下产生变形，卸去载荷，变形恢复，但载荷大于试件的弹性变形时产生塑性变形，本仪器采用杠杆法对试件进行加荷，卸荷试验，以得到试件的 回弹试模和塑限值。

The soil-based rebound modulus tester is a testing instrument. It is suitable for measuring the rebound modulus of fine-grained soil or gradation aggregate samples with a particle size of less than 20㎜ indoors. The test piece is deformed under a certain load, the load is removed, and the deformation is recovered, but the plastic deformation occurs when the load is greater than the elastic deformation of the test piece. This instrument uses the lever method to load and unload the test piece to obtain the test. Resilience test and plastic limit of the part.

土基回弹模量测定仪技术参数：

★承载板面积：

Φ25.2mm-5cm2

Φ37.4mm-11cm2

Φ50.5mm-20cm2

★杠杆比： 10:1

★外形尺寸：450X350450mm

★重量：20kg

Technical parameters of soil-based rebound modulus tester:

★ Bearing board area:

Φ25.2mm-5cm2

Φ37.4mm-11cm2

Φ50.5mm-20cm2

★ Leverage ratio: 10: 1

★ Dimensions: 450X350450mm

★ Weight: 20kg

土基回弹模量测定仪操作规程：

★试料的准备：如试料为粗颗粒的级配集料，则筛取试料中直径大于20mm的颗粒，如200mm以下的集料的颗粒组成不符合级配要求，则添加所缺粒料，使达到级配要求。

★击实试验：按击实试验法测定材料的A佳含水率和A大干容量，并绘制含水量.干容重关系图。

★制试件,对于路基土做3---4组击实功能不同的试件。

例如：击实功能分别为5.62Kgcm/C㎡(相当于轻型击实仪实验法)12.5Kgcm/Cm,19.5Ggcm/Cm左右的试件，每组6---7各点，利用试件作回弹试模试验。

★对于路面材料，参照承载比试验法制作方法制取试件，同一试件作2—4个，其中一半进行泡水测膨胀量，然后一起进行逐级载荷试验(即测{a}1211{/a})。

Operation rules of soil-based rebound modulus tester:

★ Preparation of sample: if the sample is a coarse-grained aggregate, sieve particles with a diameter greater than 20mm in the sample, if the particle composition of the aggregate below 200mm does not meet the grading requirements, add the missing particles Materials, so as to meet the grading requirements.

★ Compaction test: According to the compaction test method, determine the material A's best moisture content and A's large dry capacity, and draw the relationship between water content and dry bulk density.

★ Make test pieces, and make 3--4 test pieces with different compaction functions for subgrade soil.

For example: the compaction function is 5.62Kgcm / C㎡ (equivalent to the light compactor test method) 12.5Kgcm / Cm, 19.5Ggcm / Cm, about 6-7 points in each group Springback test.

★ For pavement materials, prepare test specimens by referring to the production method of the load-bearing test method. Two or four test specimens are made of the same test specimen, half of which is measured by the soaking in water to measure the expansion, and then the load test is performed step by step (ie {a} 1211 { / a}).

使用说明：

★选定承载板上的单位压力

1、对于计算含水量大于塑性的 土基层用0.5—10kg/平方厘米

2、对于计算含水量小于塑限的 土基层用1.0-2.0kg/平方厘米

3、对于地基层材料用，5—7Kg/平方厘米

★将带试筒的式样倒置在仪器的地板上，安放直径约为试筒四分之一的承载板：调平杠杆，使砝码的一端略翘上，并安置百分表

★预压：先计算的A大荷载对试件1-2次，卸荷预压试验，在试验过程中，进一步调整承载板的位置，承载板与试样表面的接触，杠杆的高低，并调整百分表的指针指零，并使百分表预压1mm。

★测回弹变形：将计算好的预定的单位压力分为4—6等份，作为每次加荷的数量(A后一次加荷可略大于预定的计算总压力)

Instructions for soil-based rebound modulus tester:

★ Selected unit pressure on the load plate

1. For soil bases whose calculated water content is greater than plastic, use 0.5-10kg / cm2.

2.For soil bases whose calculated water content is less than the plastic limit, use 1.0-2.0kg / cm2.

3. For foundation materials, 5-7Kg / cm2

★ Invert the style with the test cylinder on the floor of the instrument, and place a load plate with a diameter of about one-fourth of the test cylinder: level the lever, slightly raise one end of the weight, and place the dial indicator.

★ Preload: Calculate A load for 1-2 times on the test piece first, unload preload test, during the test, further adjust the position of the bearing plate, the contact between the bearing plate and the sample surface, the level of the lever, Adjust the pointer of the dial indicator to zero and preload the dial indicator by 1mm.

★ Measure the rebound deformation: divide the calculated predetermined unit pressure into 4-6 equal parts as the number of each load (the load after A can be slightly larger than the total calculated pressure)