Manufacturing assembly for chamfer test piece of jointed surface of new and old concretes and manufacturing method

Abstract

The invention relates to a manufacturing assembly for a chamfer test piece of a jointed surface of new and old concretes and a manufacturing method. The manufacturing assembly comprises a bracket, a first pouring unit and a second pouring unit; the first pouring unit comprises a first pouring mold and a first steel wire frame; the first pouring mold is equipped with an inclined plane and is used for acquiring an old concrete base block; the first steel wire frame is hung on the bracket while pouring, is located in the first pouring mold and is used for enhancing the strength of the old concrete base block; the second pouring unit comprises a second pouring mold and a second steel wire frame; the second pouring mold is used for accommodating the old concrete base block and is used for pouring a new concrete base block on the inclined plane of the old concrete base block; the second steel wire frame is hung on the bracket while pouring, is located in the second pouring mold and is used for enhancing the strength of the new concrete base block; the height of the first and second steel wire frames can be adjusted through the bracket. The strength of the chamfer test piece of the jointed surface of new and old concretes acquired by using the manufacturing assembly is uniformly enhanced and the thickness of the concrete protecting layer is uniform, so that accurate and reliable testdata of shearing strength of the jointed surface of new and old concretes can be acquired.

Description

technical field [0001] The invention belongs to the technical field of oblique shear tests on the joint surface of old and new concrete, and in particular relates to a manufacturing tool and a manufacturing method of an oblique shear test piece on the joint surface of old and new concrete. Background technique [0002] Concrete is widely used in civil engineering fields such as buildings and bridges. During the construction and use of concrete structures, various factors often cause partial concrete damage to the components. The performance of the components can be strengthened and repaired by techniques such as pouring concrete, so that the structure can meet the requirements of use. At this time, due to differences in age and strength between the poured concrete and the original concrete, a new and old concrete joint surface is formed. In addition, in prefabricated concrete structures, prefabricated concrete components are often connected by post-cast concrete to form an ...

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Problems solved by technology

[0004] In order to avoid the failure of the concrete base block before the joint surface during the oblique shear test, resulting in a small shear strength test value, Saldanha R et al. in the paper A modified slant shear test designed to enforce adhesive failure ("Construction and Building Materials" .2013, Vol. 41, pp. 673-680), it is proposed that a steel wire (reinforcement) grid can be installed in the concrete base of the oblique shear test piece to enhance the compressive strength of the concrete base, but the steel wire grid is And the position is prone to large deviation during the condensation process, resulting in uneven compressive strength of the concrete base and thickness of the protective layer

The paper does not propose a solution to the problem

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