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A method for detecting concrete slump by acoustic waves

A technology for sonic detection, concrete

Active Publication Date: 2021-06-11
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method does not take into account the loss of the concrete mixture during transportation, that is, it does not consider the change of the concrete mixture over time. The loss of the concrete mixture during transportation may cause the concrete The slump of the mixture cannot meet the needs of pumping

Method used

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  • A method for detecting concrete slump by acoustic waves
  • A method for detecting concrete slump by acoustic waves
  • A method for detecting concrete slump by acoustic waves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1 Determine the relational expression of wave velocity v and slump SL changing with time

[0038] In order to realize the above-mentioned purpose of the invention, comprise the following steps:

[0039] (1) Concrete mixture 1 is configured according to the mix ratio listed in Table 1;

[0040] Table 1

[0041] water cement sand pebbles 160kg 400kg 776kg 1164kg

[0042] (2) The raw materials configured in step (1) are mixed by the secondary feeding method (pre-mixed cement mortar method). First, put water, cement, and sand into the mixer, mix for 30 seconds to form cement mortar, and then put in stones and stir for 60 seconds to obtain mixing. homogeneous concrete mix 1;

[0043] (3) Put the concrete mixture 1 stirred in step (2) into an acrylic box 3 with a size of 10cm*10cm*20cm and a wall thickness of 5mm, and open two holes on both sides of the acrylic box 3 with a height of 10cm A hole with a diameter of 3.5cm. The purpo...

Embodiment 2

[0054] Embodiment 2 verifies the correctness of embodiment 1 relational expression

[0055] Verification example 2-1:

[0056] The difference between verification example 2-1 and embodiment 1 is only that step (1) configures concrete mixture 1 according to the mix ratio listed in table 3:

[0057] table 3

[0058] water cement sand pebbles 170kg 400kg 772kg 1158kg

[0059] The measurement results of wave velocity and slump over time and the formula calculation results of this verification example are shown in Table 4:

[0060] Table 4

[0061]

[0062] Verification example 2-2:

[0063] The difference between verification example 2-2 and embodiment 1 is only that step (1) configures concrete mixture 1 according to the mix ratio listed in table 5:

[0064] table 5

[0065] water cement sand pebbles 180kg 400kg 768kg 1152kg

[0066] The measurement results and formula calculation results of wave velocity and...

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Abstract

The invention discloses a method for detecting the slump of concrete by acoustic wave, which is to apply a stress wave on the surface of the concrete mixture to be tested, obtain the change trend of the wave velocity v with time according to the original echo signal received by the sensor, and then pass The relationship between the wave velocity v and the slump SL is obtained by combining the change trend of the slump SL with time and the change trend of the wave velocity v with time, and then the value of the slump SL is obtained by detecting the wave velocity v during detection. The method for detecting concrete slump with acoustic waves provided by the present invention responds to changes in concrete slump over time with wave velocity, effectively reduces the work intensity of workers, reduces the amount of staffing, reduces cumbersome work processes, and improves the accuracy of measurement.

Description

technical field [0001] The invention provides a detection method, which belongs to the technical field of acoustic wave detection, and in particular relates to a method for detecting the slump of concrete mixture by acoustic wave. Background technique [0002] At present, my country's projects basically use ready-mixed concrete. Ready-mixed concrete refers to cement, aggregates, water, and admixtures and mixtures mixed in according to needs. Concrete mixture that is sold after being measured and mixed, and transported to the place of use within a specified time using a transport vehicle. Compared with on-site mixing concrete, the time difference between mixing and pouring is greatly extended. The supply radius of ready-mixed concrete is generally within 10km ~ 20km. During transportation, due to poor roads, traffic jams and other reasons, the time when the concrete mixer truck reaches the destination Sometimes up to 3 hours or even longer. Although the concrete mixer truck ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04G01N29/07G01N33/38
Inventor 龙士国余高刘佩李婷
Owner XIANGTAN UNIV