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High-precision prefabrication method and device of concrete member micro cracks

A concrete and micro-crack technology, which is applied in the manufacture of tools, ceramic molding machines, etc., can solve problems such as scratching and difficulty in ensuring accuracy, and achieve high energy utilization and high precision

Active Publication Date: 2019-06-07
NANJING HYDRAULIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, the steel sheet is taken out before the concrete is formed, which will inevitably scratch the inner surface of the micro-cracks to be formed, and the volume of the micro-crack cavity may change during the curing process of the concrete after the steel sheet is taken out, making it difficult to ensure the formation Accuracy of opening width of precast microcracks in post-concrete

Method used

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  • High-precision prefabrication method and device of concrete member micro cracks
  • High-precision prefabrication method and device of concrete member micro cracks
  • High-precision prefabrication method and device of concrete member micro cracks

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Experimental program
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Embodiment 1

[0033] This embodiment further describes the structure of the device of the present invention in conjunction with the accompanying drawings.

[0034] Such as figure 1 The shown concrete component microcrack prefabrication device includes a workbench 1-1, a heating plate 1-3 and a temperature sensor 1-4; the heating plate 1-3 is fixed on the workbench 1-1, and the heating plate 1-3 and the working An insulating layer 1-2 is provided between the platforms 1-1, and concrete samples 1-6 are placed on the heating plate 1-3;

[0035] The temperature sensor 1-4 is arranged on the upper surface of the concrete sample 1-6 for measuring temperature;

[0036] Both sides of the workbench 1-1 are provided with brackets 1-5, the middle section of the upper beam of the bracket 1-5 is provided with a hollow structure, and the hollow section is provided with a track 1-8, and the temperature sensor 1-4 is limited to the rail 1-4. 8. It can slide horizontally along the track 1-8.

[0037] In ...

Embodiment 2

[0042] This embodiment specifically illustrates the method for prefabricating concrete members with microcracks using the device of Embodiment 1.

[0043] In this embodiment, the heating power is 3000W; the thickness of the heat insulating layer 1-2 is 6 mm; stainless steel is selected as the heating plate 1-3, and the thickness is 1 mm. The upper limit of temperature sensor measurement is 300 ℃. 1-7 The heat shrinkable film is made of PVC film.

[0044] The specific steps of micro-crack prefabrication of concrete members are as follows:

[0045] (1) Select PVC membranes with a thickness of 0.02 mm, 0.03 mm, 0.05 mm, and 0.08 mm to preform microcracks in concrete. The length and width of these membranes are both 40 mm.

[0046] (2) Configure C30 concrete and pour it into a 40mm×40mm×160mm steel mold. When pouring to the position where microcracks are to be prefabricated, bury the heat shrinkable film. Among them, only one thickness of PVC film is embedded in a steel mold. ...

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Abstract

The invention relates to a high-precision prefabrication method and device of concrete member micro cracks. The thickness of thermal shrinkage film is determined according to the dimensions of micro cracks to be prefabricated, and the corresponding shapes are cut out; concrete is prepared, and is poured into a steel mold; when the concrete is poured to the positions where the micro cracks are to be prefabricated at, the thermal shrinkage film is embedded, then pouring is continuously carried out till the mold is completely filled with the concrete, and concrete curing is carried out for 28 days in the standard conditions after carrying out vibration compactness; a concrete sample subjected to complete curing is placed on a heating plate to be heated, the surface, making contact with the heating plate, of the sample is changed in the heating process, and after thermal shrinkage film contracts, the micro cracks appear in the sample. According to the high-precision prefabrication method and device of the concrete member micro cracks, the width of an opening of the part, close to the surface of the sample, of one micro crack prefabricated in a concrete member is equal to the thicknessof the thermal shrinkage film embedded beforehand in the position of the micro crack, high precision is achieved, and the micro cracks can be made in a concrete test block in a short time.

Description

technical field [0001] The invention belongs to the technical field of civil engineering and concrete construction, and in particular relates to a high-precision prefabrication method and device for microcracks in concrete components. Background technique [0002] Cracks are a major hidden danger affecting the safe operation of concrete buildings during their service. Large-scale visible cracks originate from micro-cracks, and early detection of micro-cracks and corresponding protective measures can effectively avoid the occurrence of large-scale cracks. In recent years, the idea of ​​using ultrasonic-induced infrared thermography to find micro-cracks in concrete structures has gradually attracted attention, but this method is still in the stage of experimental exploration. One of the important reasons restricting the promotion of this method is that the magnitude of the opening width of the detected crack cannot be determined, and its detection mechanism is still unclear. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B1/14B28B1/087B28B1/04B28B11/24B28B11/08
Inventor 汤雷贾宇王海军顾培英张盛行
Owner NANJING HYDRAULIC RES INST