Device and method for detecting impact resistance of concrete

Abstract

The invention discloses an apparatus and a method for detecting shock resistance of concrete. The apparatus for detecting shock resistance of concrete comprises a chassis and an impact device; the chassis is placed over a concrete test block, the center of the chassis is provided with an impact hole in breakthrough, and the chassis is vertically provided with several guide rail rods; the impact device can climb on the guide rail rods and freely fall off, and the impact device can freely fall off from the guide rail rods and transverses the impact hole and impacts on the concrete test block. The method for detecting shock resistance of concrete comprises the following steps: a step 1, at least five concrete test blocks are poured; a step 2: the apparatus for detecting shock resistance of concrete is installed; a step 3: a motor with forward or reverse rotation is provided; a step 4: shock-testing is carried out; a step 5: the step 4 is repeated till the concrete test block appears cracking or penetrated cracks; a step 6: site clearing is carried out. The apparatus has small volume and is easy to carry, and shock resistance detection of the concrete can be rapidly completed.

Description

technical field [0001] The invention relates to a detection device and method for the impact resistance performance of concrete, belonging to the field of civil engineering. Background technique [0002] At present, the industry standard formulated by the American Concrete Institute (ACI) is generally adopted for the detection of the impact resistance of concrete. The continuous free-fall impact test is carried out on standard concrete samples using the falling weight method. The American ACI544 committee recommends the use of the following for the calculation of the impact energy of concrete: W=n*m*g*H ( W is the impact energy; n is the number of impacts; H is the falling height of the hammer; m is the mass of the hammer; g is the acceleration of gravity). According to this specification, many manufacturers at home and abroad produce corresponding test and measuring instruments, such as the XJL-300C drop weight test device of Hebei Chengde Hengtong Test and Inspec...

AI Technical Summary

Problems solved by technology

[0003] Although the measuring instruments produced by the instrument manufacturers according to the standards can quickly and accurately measure the impact resistance of concrete, there are several deficiencies: first, the user purchases instruments to increase the cost, which is expensive for small scientific research projects and ordinary construction inspections; The device is not easy to carry, and the concrete strength test for outdoor construction sites cannot be completed

For the use of the self-made test device, there are also the following obvious disadvantages: first, it is necessary to reset a set of experimental device parameters, which is not only cumbersome but also has a narrow scope of application; second, the continuous repetition of the ball falling and continuous bending movement It consumes human energy, especially the experiment with a large number of impacts, which is not humane enough; at the same time, the weight may swing very slightly during the test, which makes the landing area larger and the force of the test piece scattered, resulting in a larger discrete type.

Images