Direct tensile strength test method of inorganic binding material stabilizing material
A technology of inorganic binder and testing method, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problems of deviation of design results, inability to directly use asphalt mixture and cement concrete, lack of other problems, and achieve weak deformation ability , Improve the mechanical performance test, the effect of high compressive strength
Inactive Publication Date: 2019-07-19
CHINA ROAD & BRIDGE +1
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Problems solved by technology
Direct tensile test is an important method to accurately obtain the tensile strength of inorganic binder stabilized materials. However, due to the lack of direct tensile strength test methods in the current test regulations for inorganic binder stabilized materials in my country, only splitting or splitting methods can be used in pavement design. If the strength results of indirect tensile tests such as bending tests are used instead, it will lead to large deviations in design results
In addition, due to the particularity of inorganic binder stabilized materials, the direct tensile strength test method of asphalt mixture and cement concrete cannot be directly used. It is necessary to re-study and propose corresponding test methods based on the characteristics of inorganic binder stabilized materials
Method used
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Embodiment 1
[0050] Taking cement-stabilized graded crushed stone as an example, the implementation of the direct tensile strength test method for inorganic binder-stabilized materials is described.
[0051] 1) Select the cement-stabilized graded crushed stone CBG25 graded in Table 1 to carry out heavy-duty compaction tests, and determine the optimum moisture content of 5.5% and cement dosage of 6%.
[0052] Table 1 Gradation composition of cement-stabilized graded crushed stone CBG25
[0053] Sieve hole(mm) 26.5 19 13.2 9.5 4.75 2.36 1.18 0.6 0.3 0.15 0.075 Passing rate(%) 99.9 83.4 68.1 57.9 40.2 24.9 16.6 10.7 6.9 5.5 4.1
[0054]2) Since the CBG25 in step 1) is a coarse-grained material, according to the design result in step 1), 15 cylindrical specimens with a diameter×height of φ150mm×300mm were molded.
[0055] 3) Put the test pieces in step 2) in a standard health care room for health preservation, and the health preservation period is 90 d...
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The invention relates to a direct tensile strength test method of an inorganic binding material stabilizing material, and belongs to the field of highway material performance testing. A cylinder testpiece of the inorganic binding material stabilizing material is manufactured; linear displacement sensors are uniformly distributed on the surface of a cylinder; one end of the cylinder test piece isfixed onto a base; the other end of the cylinder test piece is fixed on a test machine; through the tensile loading of the test machine, a load-displacement curve is obtained; a maximum tensile load generated when the test piece is damaged is obtained; and the direct tensile strength Rt is obtained through calculation. The method provided by the invention can be used for directly reflecting the tensile intensity of the inorganic binding material stabilizing material, and more direct reference data are provided for the pavement structure design.
Description
technical field [0001] The invention relates to the technical field of road engineering, in particular to a method for testing the direct tensile strength of an inorganic binder stabilized material. Background technique [0002] Inorganic binder stabilizing materials are mainly used for the pavement base in road engineering. In the design of pavement structure, the tensile strength of the base is very critical, and often controls and dominates the design results. Direct tensile test is an important method to accurately obtain the tensile strength of inorganic binder stabilized materials. However, due to the lack of direct tensile strength test methods in the current test regulations for inorganic binder stabilized materials in my country, only splitting or splitting methods can be used in pavement design. Substituting the strength results of indirect tensile tests such as bending tests will lead to large deviations in design results. In addition, due to the particularity of ...
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Login to View More IPC IPC(8): G01N3/08
CPCG01N3/08
Inventor 刘晋周周兴业王旭东周广利孟壮肖倩
Owner CHINA ROAD & BRIDGE