Method for detecting concrete slump through sound waves

A technology of acoustic wave detection and concrete, which is applied in the field of acoustic wave detection of concrete mixture slump, which can solve the problem that the concrete mixture slump cannot satisfy pumping, the loss of concrete mixture is not considered, and the concrete mixing is not considered It can reduce the amount of staffing, the measurement data is accurate and reliable, and the installation is simple.

Active Publication Date: 2019-05-21
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

Method used

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  • Method for detecting concrete slump through sound waves
  • Method for detecting concrete slump through sound waves
  • Method for detecting concrete slump through sound 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

the 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...

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

the 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

the sand

pebbles

180kg

400kg

768kg

1152kg

[0066] The measurement results and formula ...

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Abstract

The invention discloses a method for detecting concrete slump through sound waves. Stress waves are applied to the surface of a to-be-measured position of a concrete mixture; according to an originalecho signal received by a sensor, the change trend of the wave velocity v over time is obtained, the relation between the wave velocity v and the slump SL is obtained by combining the change trend ofthe slump SL over time and the change trend of the wave velocity v over time, and the value of the slump SL is obtained by detecting the wave velocity v in the detection process. According to the method for detecting the slump concrete through the sound waves, the change of the concrete slump over time is reflected through the wave velocity, the working intensity of workers is effectively reduced,the personnel allocation amount is reduced, the complex working process is reduced, and the measurement accuracy is improved.

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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IPC IPC(8): G01N29/04G01N29/07G01N33/38
Inventor 龙士国余高刘佩李婷
Owner XIANGTAN UNIV
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