Test method for determining CRTSI type CA mortar asphalt film thickness

Abstract

The invention discloses a test method for determining the CRTSI type CA mortar asphalt film thickness. The CRTSI type CA mortar asphalt film thickness is determined through combination between tests and theoretical calculation. The CA mortar solidified body comprises, by volume, asphalt, cement hydration particles, sand and pores. The asphalt film thickness is determined according to the volume composition relationship of the CA mortar solidified body, and the average particle diameter of the cement hydration product particles, the average particle diameter of the sand, and the size (average particle diameter) and porosity in the CA mortar solidified body are determined at first. The volume composition relationship of the CA mortar solidified body is sufficiently taken into consideration during calculation of the asphalt film thickness. The particle diameter composition of the sand is obtained through a screening test, the particle diameter composition of the cement hydration products is obtained through a laser particle diameter analysis test, and the composition of the pores in the CA mortar solidified body is obtained through a mercury injection test. On this basis, the CA mortar asphalt film thickness can be accurately calculated through the test method.

Description

technical field [0001] The invention relates to a test method for the thickness of cement asphalt mortar and asphalt film of CRTS I type ballastless track cushion of high-speed railway. Background technique [0002] Cement asphalt mortar (cement asphalt mortar referred to as CA mortar) is a new type of organic-inorganic composite material formed by bonding and curing cement, asphalt emulsion, sand and various admixtures. The important role of vibration in three aspects. high-speed railway ballastless track figure 1 shown. [0003] The CRTS type ballastless track used in my country is mainly divided into two types: CRTSI type and CRTSII type. The research results at this stage show that the CA mortar (asphalt cement mass ratio A / C between 1.4 and 1.6) for CRTSI type ballastless track is fine. The visual structure is similar to that of asphalt mixture, that is, inorganic particles (cement hydration products and quartz sand) are dispersed in asphalt. For such asphalt-based m...

AI Technical Summary

Problems solved by technology

In the current engineering practice and scientific research, there is no relevant test that can directly measure the asphalt film thickness of CRTSI type CA mortar, and the particle size of cement particles will become larger after hydration, so it cannot be directly calculated from theory Angle Calculation of Bituminous Film Thickness for CA Mortar Curing Systems

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