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Automatic testing system used for testing fresh mixing performance of concrete

An automatic test system, concrete technology, applied in flow characteristics, measuring devices, instruments, etc., can solve the problems of concrete without good workability measurement methods and test systems, and achieve the effects of simple measurement methods, convenient use, and high measurement accuracy

Active Publication Date: 2013-07-10
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that there is no good workability measurement method and test system for concrete with high fluidity, an automatic test system for testing the workability of fluid concrete in the fresh state is provided.

Method used

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  • Automatic testing system used for testing fresh mixing performance of concrete

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example 1

[0021] Design a typical combination such as C50. Under the condition that the amount of other raw materials is the same, the slump and cohesiveness can be controlled by adjusting the amount of admixture. For example, the slump is controlled to 180~260mm, and the cohesion and water retention are good. or bad. Stir 50-100L. After the mixing is completed, test the slump performance according to the standard method of consistency test according to the national standard GB / T 50080-2002, or the improved slump method based on this. Install the measurement system on the measurement plane, press the trigger button of the automatic test system while lifting the slump cylinder or opening the valve, the automatic test system will automatically record the whole process of slurry flow and obtain all the data of the working performance . And use wireless or wired methods to transmit the measurement results to the analysis and processing software, and the software can automatically obtain pa...

Embodiment 1

[0024] Concrete C50 for a certain project has a design slump of 200±20mm, which requires good cohesion and water retention. The design mix ratio is: P·O cement 400kg / m 3 , Class I fly ash 50 kg / m 3 , S95 grade slag fine powder 50 kg / m 3 , sand 659 kg / m 3 , gravel 1112 kg / m 3 , water 154 kg / m 3 , and add an appropriate amount of admixture to control the workability. Stir 30L in the laboratory.

[0025] According to the national standard GB / T 50080-2002, the slump test is carried out on the flat plate, and the material is loaded in layers and compacted according to the requirements. Place the automatic test system in front of the slump tester, and press the start button of the test system while lifting the slump.

[0026] Wait for the slurry to stop flowing and the test system to stop. The measurement image is transmitted to the data processing system through the image acquisition module in a wireless or wired manner (see attached figure 1 )superior. Select the perform...

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Abstract

The invention provides an automatic testing system used for testing the working performance of freshly mixed concrete, and is used for solving the problem that the working performance of the concrete can only be tested by slump and visual inspection currently and the working performance of the concrete can not be accurately and comprehensively evaluated. The automatic testing system comprises a charge coupled device CCD image collection sensor, a mounting bracket and a data processing system, wherein the data processing system comprises an image obtaining module, an image processing and identifying module, an image analyzing module, a result judging module and an output module. When being used for performing automatic flow tests such as slump according to the national standard, the automatic testing system provided by the invention can be used for accurately and comprehensively obtaining the working performance of the concrete including the slump, slumping flow diameter, flow velocity, uniformity, water-retaining property, and the like, and the automatic testing system can be also used for researching the effect degrees of mechanical property, crack resistance and permeability according to the built-in working performance so as to comprehensively master and evaluate the working performance of the concrete to provide a reference frame for controlling the concrete quality on construction sites.

Description

technical field [0001] The invention relates to the field of building materials and testing systems, in particular to the testing of the working performance of relatively fluid concrete in a freshly mixed state. Background technique [0002] As we all know, the concrete used in modern engineering has developed into a large-fluidity concrete that adopts the pumping construction method, which is particularly prone to cracks. The workability of concrete has an important impact on the mechanical properties, crack resistance and durability of concrete. The workability of freshly mixed concrete means that the concrete mixture can keep its composition uniform without stratification, segregation, bleeding, etc. It is suitable for construction operations such as transportation, pouring, pumping, and compaction, and can obtain uniform quality. Dense concrete properties, including fluidity, cohesion, water retention, pumpability, uniformity, and ease of compaction. At present, the wor...

Claims

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Application Information

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IPC IPC(8): G01N11/00G01N21/84
Inventor 庞超明徐剑
Owner SOUTHEAST UNIV
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