Multi-functional test system and method for concrete durability under action of continuous pressure

Abstract

The invention discloses a multi-functional test system and method for concrete durability under an action of continuous pressure, wherein the system comprises an upper end plate and a lower plate oppositely distributed up and down; a steel pull rod upright arranged and fixedly arranged between the upper end plate and the lower end plate; a first pressure transmission plate which is arranged between the upper end plate and the lower end plate, is in sliding fit with the steel pull rod, and is provided with holes or bulges in the center; a jack and a pressure sensor arranged between the upper end plate and the first pressure transmission plate from up to down; an upper hinge plate hinged on a bottom face of the first pressure transmission plate; a lower hinge plate hinged on a top face of the lower end plate; a concrete test piece compressed between the upper hinge plate and the lower hinge plate; and a displacement sensor fixedly arranged on the concrete test piece. The invention further discloses a method for testing concrete durability in multiple eroding environments by utilizing the multi-functional test system, the device is simple, the method is simple and feasible, and an objective appraisal for concrete durability can be provided.

Description

technical field [0001] The invention relates to the field of durability testing of engineering concrete materials and structures, in particular to a multifunctional testing system and method for durability of concrete under continuous pressure. Background technique [0002] Concrete durability determines the safety of concrete structures throughout their service life. Statistics at home and abroad show that the direct and indirect losses caused by the poor durability of concrete are huge, which has caused heavy financial burdens in both developed and developing countries. [0003] At present, my country is carrying out large-scale infrastructure construction, which has attracted the attention of the world. Many large-scale projects such as cross-sea bridges, island-connecting projects, and cross-river and sea tunnels have been launched. Durability has very high requirements. [0004] In recent decades, a large number of concrete durability studies have been carried out at h...

AI Technical Summary

Problems solved by technology

[0006] Based on the existing research data, it is found that the current method of applying axial load to concrete specimens by post-tensioning prestressing method or by screw, steel plate and torque wrench is difficult to maintain the original load due to the influence of concrete creep under long-term loading. Some load levels, and the deformation of concrete cannot be monitored and controlled in real time; in the durability test, it is necessary to put the device into an erosion solution containing harmful ions such as chloride ions and sulfate ions, and the corrosion of the device by the environment will affect the durability research results The impact is great, and the test results cannot accurately reflect the objective relationship between the real load level and durability; at the same time, the measurement index is single, and the way of applying the load is complicated or inconvenient

[0007] Based on the fact that when the load is applied to the concrete in the existing test device, the load distribution is uneven, and the load cannot be monitored and adjusted in real time, and the deformation of the concrete cannot be tested in real time. When the device is placed in the corrosion solution, the corrosion effect of the environment on the device is tested when the durability is tested. Therefore, it is necessary to provide a test system and test method that can truly reflect the durability of concrete

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