Concrete durability test device and evaluation method under the coupling of load and freeze-thaw cycle

Abstract

The invention discloses a load and freeze-thaw cycle coupled concrete durability testing device and an evaluation method. The device comprises a concrete load and freeze-thaw cycle coupling device, aconcrete strain testing system and a freeze-thaw testing machine. The concrete load and freeze-thaw cycle coupling device is placed in the freeze-thaw testing machine for a freeze-thaw cycle couplingtest. Sample strain data is recorded at real time through the concrete strain testing system, and by testing parameters such as rate of strain change, rate of mass change, etc. of a test piece after acertain times of load and freeze-thaw cycle coupling, durability of the concrete is evaluated. According to the invention, durability of loaded concrete (member) serving in severe cold areas can be rapidly tested, and load and freeze-thaw cycle coupling effect in actual service is accurately simulated. The method is simple to operate and is scientific and effective. The invention provides technical support for durability design and material selection of large-scale engineering structures under complex service conditions such as severe cold condition, etc.

Description

technical field [0001] The invention discloses a concrete durability test device and evaluation method under the coupling action of load and freeze-thaw cycle, in particular to a concrete durability test device under the coupling action of load and freeze-thaw cycle and concrete under the coupling action of load and freeze-thaw cycle The utility model relates to a durability evaluation method; it belongs to the technical field of concrete performance measurement. Background technique [0002] Since the birth of concrete materials, it has been the most widely used and used building material in the world. With the extension of service life and the continuous extension of engineering structures to harsh service environments such as severe cold and ocean, the durability of concrete materials and their structures has become one of the focuses in the field of concrete research. [Miao Changwen. Modern Concrete Theory and Technology [M ] Science Press, 2012.3.], and how to effectiv...

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Problems solved by technology

Liu Jiankun and others invented a soil freeze-thaw experimental system that can apply dynamic loads. The system is composed of a hydraulic system and a computer control system. By applying sinusoidal or square wave forces to soil samples, it can simulate the operation of high-speed trains under different conditions. To test the freezing characteristics of soil at different temperatures [the publication number is CN101699284A], but the main object of the device is frozen soil; Diao Bo et al. invented a load-bearing device for the freeze-thaw load coupling test of reinforced concrete beams [ The publication number is CN20161017U]. This device is relatively simple, mainly for large-scale specimens such as reinforced concrete beams, requires specific large-scale environmental conditions, and applies bending and tension loads. The operation is complicated and difficult to popularize.

In summary, so far, there have been no reports on the test system and evaluation method for the rapid testing of the frost resistance of concrete under the coupled action of simulated loads and freeze-thaw cycles. The requirements for the durability design and material selection of large-scale engineering structures under complex service conditions, in view of this, the present invention intends to develop a test device and method that can quickly and effectively test and evaluate the durability of concrete under the coupled action of load and freezing, in order to ensure that the concrete engineering structure Service life provides technical support

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