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Method for researching measured value of concrete slump cone based on critical value comparison method

A slump and concrete technology, which is applied to measuring devices, flow characteristics, instruments, etc., can solve the problems that new slump cylinders are impractical to formulate new specifications and cannot be used directly, and achieve convenient measurement of slump values. Effect

Inactive Publication Date: 2015-05-13
NANJING INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When using a new type of slump cylinder for measurement, it is obvious that the industry specifications corresponding to the original standard test method cannot be used directly, and it is not practical to formulate new specifications for the new type of slump cylinder, so there is a need for a method that can convert the new type of slump Barrel measurements combined with industry norms

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  • Method for researching measured value of concrete slump cone based on critical value comparison method
  • Method for researching measured value of concrete slump cone based on critical value comparison method
  • Method for researching measured value of concrete slump cone based on critical value comparison method

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Embodiment

[0024] A method of measuring values ​​of concrete slump cylinders based on the boundary value comparison method. After using the opening and closing slump cylinders to measure several kinds of concrete with different slumps multiple times, each group of measurement data is obtained, and invalid data are excluded. Take the arithmetic mean value for each group of measurement data to obtain the slump value t measured by opening and closing the slump cylinder.

[0025] Repeat the above steps to get the measured slump value t of each concrete 1 , t 2 , t 3 ,...; the measured slump value t 1 , t 2 , t 3 , ... with conversion factor k (i+1) / 2 =(y i+1 -y i ) / (t i+1 -t i )(i=1, 3, 5, 7), where y i ={10, 30, 35, 50, 55, 70, 75, 90}, i={1, 2, 3, 4, 5, 6, 7, 8}, combined to obtain the converted slump value , specifically: for the concrete whose measured slump value is x, the formula (x-t i ).k (i+1) / 2 +y i (t i ≤x≤t i+1 ,i=1,3,5,7), where k (i+1) / 2 is a constant to obtain...

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Abstract

The invention provides a method for researching a measured value of a concrete slump cone based on a critical value comparison method. The method comprises the following steps: measuring concrete with different slumps by using an opening and closing slump cone to obtain each group of measured data, and taking an arithmetic mean value of each group of measured data after excluding invalid data to obtain the slump t measured by the slump cone; repeating the above step to obtain slumps t1, t2, t3... measured by each type of concrete; and combining the slumps t1, t2, t3... measured with a conversion coefficient to obtain a converted slump. The critical value comparison method measures the slump by adopting a precise measuring opening and closing slump cone, so that the measured valve of the slump cone is reliably combined with a code value in the industry.

Description

technical field [0001] The invention relates to a method for measuring values ​​of concrete slump cylinders based on a boundary value comparison method, and belongs to the field of measuring instruments for material properties of civil engineering materials. Background technique [0002] Concrete slump mainly refers to the plasticizing performance and pumpability of concrete, and specifically refers to the measured value of the fluidity of the concrete mixture when the plasticity and water retention meet the requirements. Therefore, it can also be said that the size of the slump value reflects the workability of concrete. The workability of concrete is the performance of whether the concrete is easy to construct and operate and is uniform and dense. It is a very comprehensive performance which includes fluidity, cohesion and water retention. The larger the slump value, the better the workability of concrete. Therefore, at present, the workability is usually expressed by me...

Claims

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Application Information

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IPC IPC(8): G01N11/00
Inventor 庞汉松陆韬张伟伟范杰
Owner NANJING INST OF TECH
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