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Test equipment and test method for evaluating forming performance of product concrete

A technology for testing equipment and molding performance, which is applied in the direction of material inspection products, instruments, measuring devices, etc., and can solve problems such as backward evaluation methods

Pending Publication Date: 2018-10-26
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the evaluation methods for the performance of concrete products are relatively backward, and there is no unified method to characterize the performance of different concrete products with a scientific and reasonable value.

Method used

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  • Test equipment and test method for evaluating forming performance of product concrete
  • Test equipment and test method for evaluating forming performance of product concrete
  • Test equipment and test method for evaluating forming performance of product concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The embodiment of the present invention provides a test equipment and method for evaluating the formability of prefabricated sleeper concrete, which specifically includes the following contents:

[0023] 1. The frequency conversion vibration equipment such as figure 1 As shown, it consists of a vibrator (7), a vibration table (4), a frequency conversion control cabinet (8), a suspension and guide device for moving parts (5), a support device (6), a slump cylinder (1), and a special container The material container (2); the vibration frequency of the frequency conversion vibration equipment is 5Hz~200Hz, the accuracy is greater than or equal to 0.1Hz, the amplitude is less than or equal to 20mm, and the accuracy is greater than or equal to 0.01mm;

[0024] 2. Use the concrete slump tester to test the slump value of the newly mixed concrete to be 35mm, choose a type I container (2a) with a diameter (D1) of 240mm and a height (H1) of 150mm, and a special container ( 2) Sp...

Embodiment 2

[0030] The embodiment of the present invention provides a test equipment and method for evaluating the formability of prefabricated track slab concrete, which specifically includes the following contents:

[0031] 1. Use a concrete slump tester to test the slump value of the newly mixed concrete, and the value is 110mm. Select a type II container (2b) with a diameter (D2) of 320mm and a height (H2) of 75mm. Wet slump cylinder (1) and Type II material storage container (2b), and ensure that there is no clear water on the inner wall of the slump cylinder (1) and the inner wall of the Type II material storage container (2b);

[0032] 2. Place the slump cylinder in the middle of the Type II container (2b), then put the mixed concrete (9) into the slump cylinder evenly in three layers, each layer of concrete (9), Use a tamping rod to form a spiral form from the edge to the center to insert and tamp 25 times evenly. After tamping, the height of each layer of concrete (9) is about on...

Embodiment 3

[0037] The embodiment of the present invention provides a test equipment and method for evaluating the formability of prefabricated box girder concrete, which specifically includes the following contents:

[0038] 1. Use a concrete slump tester to test the slump value of the newly mixed concrete to be 200mm, select a type IV container (2d) with a diameter (D4) of 600mm and a height (H4) of 25mm, wet slump cylinder (1) and Type IV material container (2d), and ensure that there is no clear water on the inner wall of the slump cylinder (1) and the inner wall of Type IV material container (2d);

[0039] 2. Place the slump cylinder (1) in the middle of the Type IV container (2d), then put the mixed concrete (9) into the slump cylinder (1) evenly in three layers, each For the concrete layer, use a tamping rod to insert and tamp 25 times evenly in a spiral form from the edge to the center. After tamping, the height of each layer of concrete (9) is about one-third of the height of the...

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Abstract

The invention provides test equipment and a test method for evaluating the forming performance of product concrete. The test method particularly includes filling a slump cone placed in the middle of aspecial accommodating container with stirred concrete with known slump; fixing the special accommodating container on a vibration tabletop of variable-frequency vibration equipment; lifting the slumpcone; turning on vibration control switches to allow the tabletop to vibrate at set frequencies; observing the deformation capacity and the deformation speed of the concrete; recording the vibrationtime from the moment when the tabletop starts to vibrate to the moment when the special accommodating container is filled with the concrete and the surface of the concrete is completely subjected to bleeding; multiplying the vibration frequencies by unified physical variables and then dividing products by the vibration time to obtain computation numerical values which are forming indexes of the product concrete. The unified physical variables are height and diameter ratios of the accommodating container. The forming indexes can be used for representing the forming performance of the product concrete. The test equipment and the test method have the advantages of wide applicability, simplicity and convenience in operation, high measurement accuracy and the like. Besides, the test equipment and the test method can be used for evaluating forming and compacting difficulty levels of different types of product concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete work performance testing, and in particular relates to a detection device and a test method for evaluating the formability of concrete products. Background technique [0002] Concrete mixture is a gas-liquid-solid multiphase material formed by mixing and stirring cement, mineral admixtures, sand, stones, water and admixtures. The particle size of each component is uneven, and the flow of each component The properties are different. In order to measure the working performance of concrete mixture and evaluate its formability, in addition to the slump test widely used in various countries in the world, people have also proposed compaction factor test, remodeling test, Viber consistency test, increasing Although these methods have achieved some success in quantitative determination, they can only quantitatively measure a single characteristic of the workability of ordinary concrete, and only combine ...

Claims

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Application Information

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IPC IPC(8): G01N33/38
CPCG01N33/383
Inventor 谢永江翁智财刘子科王月华胡建伟何龙
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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