Device and method for real-time testing of volume deformation of cement-based composite materials after hardening

Abstract

The invention provides a real-time testing device and a real-time testing method of size deformation after cement based composite materials hardening. The real-time testing device and the real-time testing method of the size deformation after the cement based composite materials hardening comprise a measurement component, a detachable component and a fixing component, wherein the fixing component comprises a base and an outer die. The outer die is arranged at an edge of the base and is perpendicular to the base. The detachable component comprises a round inner die which is perpendicular to the base, and the diameter of the round inner die is 0.5-0.8 times as long as the width of the outer die. The measurement component comprises a dial indicator and a test probe, and the dial indicator penetrates through holes formed in the outer die and the round inner die. The test probe is pre-embedded in a test piece, and the position of the test probe corresponds to the dial indicator. Through a round inner forming test piece, wherein the diameter of the round inner forming test piece is far larger than the height of the round inner forming test piece, the test piece is enabled to freely set, harden and deform in the outer die with the diameter larger than that of the inner die, radial deformation quantity of the test piece after preheating is continuously tested by the adoption of the dial indicator, and under the premise that the test piece is not moved, and the deformation of the test piece cannot be restrained by containers around, the testing device can effectively, continuously and accurately test shrinkage and deformation of the cement based composite material after hardening.

Description

technical field

[0001] The invention relates to the technical field of building material testing, in particular to a real-time testing device and method for volume deformation of cement-based composite materials after hardening. Background technique

[0002] At present, the preparation and testing technology of cement and concrete is constantly leaping forward, and the composition of cement-based materials is becoming more and more complex and diversified. The working performance of concrete is mainly improved by the incorporation of inorganic mineral admixtures, admixtures and different types of organic materials. , durability and strength to form cement-based composite materials; this material system will become one of the important trends in the development of civil engineering materials in the future. In particular, fly ash with good activity effect, morphological effect, and micro-aggregate effect, emulsified asphalt with outstanding rheological properties, and gypsum w...

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