Method for measuring early elastic modulus of mass concrete

Abstract

The invention provides a mass concrete early-stage elastic modulus measuring method, belongs to the technical field of mass concrete quality control, and aims to effectively evaluate the mass change process of mass concrete. The method comprises the following steps: firstly, binding and fixing a stress sensor and a crack meter along a steel bar at an internal measuring point of the mass concrete structure; the method comprises the following steps of: firstly, pouring fluid concrete, setting the initial elastic modulus of a concrete structure to be 0, secondly, reading initial data of a stress sensor and a crack meter as an initial stress value and an initial strain value when the elastic modulus is 0, and then, reading the stress sensor and the crack meter at the same acquisition frequency during concrete curing, so that the initial stress value and the initial strain value are obtained. Respectively deducting an initial stress value and a strain value to respectively serve as a stress change value and a strain change value; and finally, taking the ratio of the stress change value to the strain change value as the actual elastic modulus of the concrete, and obtaining the elastic modulus calculation values in different time periods by drawing an elastic modulus evolution curve.

Description

technical field [0001] The invention relates to the technical field of mass concrete quality control, in particular to a method for measuring the early elastic modulus of mass concrete. Background technique [0002] The main factor affecting the construction quality of mass concrete structures is the change of heat of hydration during pouring and curing of concrete. Due to the hydration of cement and other cementitious materials, the strength of concrete increases with the evolution of temperature. However, due to the differences in the size of the mass concrete, the contact surface with the atmospheric environment / bottom cushion, and the concrete mix ratio, it is difficult to use a unified scale or measurement method to reflect the strength evolution of the concrete structure in the monitoring of heat of hydration. referential indicators. [0003] For a mass concrete structure, the direct indicator reflecting its strength evolution is the elastic modulus. From the initial ...

AI Technical Summary

Problems solved by technology

However, due to the differences in the size of the mass concrete, the contact surface with the atmospheric environment / bottom cushion, and the concrete mix ratio, it is difficult to use a unified scale or measurement method to reflect the strength evolution of the concrete structure in the monitoring of the heat of hydration. referential index