Concrete temperature stress testing machine and creep testing method

Abstract

The invention discloses a concrete temperature stress testing machine and a creep testing method. The concrete temperature stress testing machine comprises a free deformation testing machine and a restrained deformation testing machine; the restrained deformation testing machine comprises a bottom die plate, side die plates, two P wave sensors, two S wave sensors and a restrained deformation detection device; the bottom die plate and the side die plates are matched to form a restrained die cavity suitable for arranging a concrete restrained test piece, and two through holes are formed in the bottom die plates; the two P wave sensors are correspondingly arranged on the upper surface and the lower surface of the concrete restrained test piece, and the P wave sensor arranged on the lower surface of the concrete restrained test piece is located in one through hole; the two S wave sensors are correspondingly arranged on the upper surface and the lower surface of the concrete restrained test piece, and the S wave sensor arranged on the lower surface of the concrete restrained test piece is located in the other through hole. According to the concrete temperature stress testing machine, concrete creep can be accurately detected, and a detection result is closer to the actual condition.

Description

technical field [0001] The invention belongs to the technical field of concrete testing in civil and hydraulic engineering, and relates to a concrete temperature stress testing machine and a creep testing method based on the concrete temperature stress testing machine. Background technique [0002] The creep characteristic of concrete is an important index to evaluate the early crack resistance of mass concrete. The strength of creep ability is an important factor affecting the early temperature cracking of mass concrete. At present, the most effective test method for simulating the temperature stress of concrete under constraints is the concrete temperature stress testing machine (TSTM). The TSTM test method for creep is also quite different from the conventional creep test with the load constant. [0003] At present, the creep test method proposed by Kovler is the most widely used by scholars. This method is based on the closed-loop computer control theory. Two sets of te...

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Problems solved by technology

[0005] Although Lin gave the theoretical calculation formula of elastic deformation, the use of "active method" to measure the elastic modulus will cause damage to the early concrete specimens, and the measured elastic modulus has a large error, which will further affect the creep results. cause greater impact

At present, there are few methods for measuring the creep of concrete using the TSTM system at home and abroad after considering the stiffness of the testing machine.

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