How to measure elastic modulus of ca mortar

Abstract

The invention discloses a method for detecting the elastic modulus of CA mortar. The method comprises the steps that firstly a cylinder test piece and a square test plate surface are separately processed by simulating working conditions, a breaking limiting value of the cylinder test piece is firstly measured by using a triaxial test machine, then stable normal tolerable values are taken to measure the square test plate surface according to the force characteristics of the CA mortar, and then the elastic modulus value of the square test plate surface under different stress characteristics is measured according to the relationship between the force and the deformation. Since a press machine is subjected to value control, when the measurement is performed, the initial characteristics of thetest plate surface are not changed, the integrity of a measured object is ensured, multiple tests are performed conveniently, the measurement accuracy is further improved, the actually processed elastic modulus of the CA mortar is restored, and excellent test data are provided for the preparation of ballastless tracks.

Description

technical field [0001] The invention belongs to the field of testing the mechanical properties of materials, and relates to a testing method for the elastic modulus of CA mortar with both measurement accuracy and efficiency. Background technique [0002] Slab track is a kind of ballastless track structure that is suitable for the development of high-speed railway. It has a better and more stable track structure than ballasted track, and the maintenance workload and maintenance cost of operation are far lower than those of ballasted track. ballast track. [0003] Generally speaking, the slab track structure is mainly composed of track slabs, concrete bases, convex blocks and rail fasteners. Fill the buffer material layer between and around the convex block, and eliminate the construction error of concrete components at the same time. As a buffer filling material, it should have both certain elasticity and certain strength. Cement mortar has sufficient strength but insuffici...

AI Technical Summary

Problems solved by technology

As a buffer filling material, it should have both certain elasticity and certain strength. Cement mortar has sufficient strength but insufficient elasticity. Asphalt has good elasticity but low strength and is greatly affected by temperature. Therefore, the combination of the two is used. Asphalt mortar is used as the elastic cushion material, and the formed cement asphalt mortar elastic cushion (cement asphalt motar, referred to as CA mortar layer) is the key component of the slab track, which is composed of special asphalt emulsion, cement, admixture materials, fine aggregate, Water, aluminum powder and other materials are blended at room temperature. There are still considerable gaps in air content, fluidity, durability, and frost resistance of CA mortars from different manufacturers and process conditions. It will directly affect the compressive strength of the slab ballastless track, increase the impact resistance, wear resistance, durability and maintenance workload

However, in the prior art, the elastic modulus of CA mortar is usually obtained by calculation methods, but the calculation methods obtained by the calculation methods are usually ideal values, and in the actual construction process, due to construction technology and environmental factors At the same time, the formation of CA mortar on the concrete base will also be affected by the material properties of the base. Such different types of influence will lead to the actual elastic modulus of the CA layer after the CA mortar is formed and the reference calculation value. There are usually large differences, making the referenced operand values ​​often of limited usefulness in practical applications