Test method for expansion ratio of cement emulsified asphalt mortar

Abstract

The invention relates to a test method of material characteristic, in particular to a test method for expansion ratio of a cement emulsified asphalt mortar, which solves the problem of poor repeatability and high variation coefficient of a measuring result of the measuring cylinder height variation method and the like. The method comprises the following steps: erecting a measuring cylinder on a horizontal plane; calibrating a volume V0 of the measuring cylinder and the volume V of an erlenmeyer flask; injecting the cement asphalt mortar into the erlenmeyer flask, making the mortar surface be flush with the flask mouth, and recording the mass m of the mortar; obtaining an apparent density rho from the volume V of the erlenmeyer flask and the mass m of the mortar; putting the measuring cylinder on a balance to deduct the mass of the measuring cylinder, injecting part of the mortar in the erlenmeyer flask into the measuring cylinder, and recording the mass m0 of the mortar; calculating an initial volume V1 of the mortar injected into the measuring cylinder; putting the measuring cylinder on the balance to deduct the mass of the measuring cylinder after 24 hours, filling the measuring cylinder with water, recording the mass m1 of the water added, and calculating a volume V2 of the water added; and the expansion ratio (percent) can be obtained through a formula of ((V-V1-V2) / V1)*100%. The repeatability of the measuring result is high, the range, the standard deviation and the variation coefficient of the measurement data are less than that of the measuring cylinder height method, and the operation is simple.

Description

technical field [0001] The invention relates to a method for detecting material properties, in particular to a method for detecting the expansion rate of cement emulsified asphalt mortar. Background technique [0002] As we all know, cement emulsified asphalt mortar for slab ballastless track (abbreviated as CA mortar) is an organic-inorganic composite material between the track slab and the bottom plate of the slab ballastless track system, with a thickness of 40-60mm, which can support, adjust, absorb and isolate vibration, etc. It is one of the key functional materials of high-speed railway system. CRTS I-type slab ballastless track CA mortar has the characteristics of high toughness, low strength (28d, ≥1.8MPa), low elastic modulus (28d, 100-300MPa), and the hardened matrix is ​​interpenetrated by cement hydrate and asphalt. network structure. Since the mortar will have a certain volume change during the setting and hardening process, such as cement hydration, water ev...

AI Technical Summary

Problems solved by technology

[0015] In order to solve the problems of inaccurate measurement, poor repeatability of measurement results, large coefficient of variation and cumbersome operation by adopting the measuring cylinder height change method in the existing cement asphalt mortar expansion rate detection method, the present invention provides a cement emulsified asphalt mortar expansion rate test method. Detection method

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