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Method for testing and analyzing morphology characteristics of machine-made sand

A technology of characteristic testing and analysis methods, applied in the field of concrete, can solve the problems of poor accuracy and uniqueness of measurement results, large differences in measurement results, and inconvenience for promotion, etc., and achieves the effect of convenient test work and improved workability.

Pending Publication Date: 2019-12-10
重庆富普新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages: ① This test needs to measure the relative gross volume density of fine aggregates, which has been proved by engineering practice; it is unrealistic to measure the relative gross volume density of machine-made sand and stone chips, and the accuracy and uniqueness of the measurement results are poor
②The correlation between the angularity of some aggregates and the performance of the mixture is not good
③ The gradation of the test sample by this method is fixed, and the angularity of fine aggregates of different gradations cannot be distinguished
④ The gross volume relative density of fine aggregates is more subjective and the results are inaccurate
Disadvantages: ① Poor execution, easy to cause misunderstandings and contradictions, cumbersome work procedures, difficult to master, not easy to promote
②The measurement results are quite different, and the internal meridian of the funnel is not uniform for different grades
③For general machine-made sand, it is difficult for the measurement results to meet the requirement of not less than 30S
The results of the two currently recommended methods are quite different, and the correlation of the results is poor

Method used

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  • Method for testing and analyzing morphology characteristics of machine-made sand
  • Method for testing and analyzing morphology characteristics of machine-made sand
  • Method for testing and analyzing morphology characteristics of machine-made sand

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Experimental program
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Effect test

Embodiment 1

[0060] Embodiment 1 Process machine-made sand and carry out sand sieve analysis

[0061] Using crushed stones of 5mm to 10mm as raw materials, the V7-10 sand making machine of Fujian Nanfang Road Machinery Co., Ltd. is used to process machine-made sand, and the fineness modulus of granite machine-made sand is 2.7 as the operating parameter control benchmark of the sand making machine (the sand making machine The sand making machine production line is designed with a separation stone powder process), and the production control parameters of the V7-10 sand making machine are shown in Table 1:

[0062] Table 1 Production control parameters of V7-10 sand making machine

[0063]

[0064] The mechanism sands of granite, limestone, diabase and basalt are abbreviated as HGY, SHY, HLY and XWY respectively. The results of sand sieve analysis of the four lithology mechanisms are shown in Table 2:

[0065] Table 2 Four kinds of machine-made sand gradation

[0066]

[0067]

Embodiment 2I

[0068] Embodiment 2Ipp6.0 morphology analysis

[0069] The photos of particles with a particle size of 2.36mm-1.18mm and 2.36mm-4.75mm in the four kinds of machine-made sand (HGY, SHY, HLY, XWY) before and after image processing are shown in Fig. Figure 1-8 As shown, the roundness value test data are shown in Table 3.

[0070] in: figure 1 (a) is the digital image of HGY particles with a particle size of 2.36mm-4.75mm before processing, figure 1 (b) is the digital image of processed HGY particles with particle diameters ranging from 2.36 mm to 4.75 mm. figure 2 (a) is the digital image of HGY particles with a particle size of 2.36mm-1.18mm before processing, figure 2 (b) is the digital image of HGY particles with a particle size of 2.36 mm to 1.18 mm before processing. image 3 (a) is the digital image of SHY particles with a particle size of 2.36mm-4.75mm before processing, image 3 (b) is the digital image of SHY particles with a particle size of 2.36 mm to 4.75 mm b...

Embodiment 3

[0074] Embodiment 3 professional microscope morphology analysis

[0075] Four kinds of machine-made sands (HGY, SHY, HLY, XWY) with a particle size of 1.18mm-0.6mm (a), 0.6mm-0.3mm (b), and 0.3mm-0.15mm (c) have different particle shapes under a professional microscope Such as Figure 9 , Figure 10 , Figure 11 and Figure 12 shown.

[0076] Observed Figure 9 , Figure 10 , Figure 11 and Figure 12 It can be seen that the 1.18mm-0.6mm grain size particles of the four kinds of machine-made sand have no obvious edges and corners, and their shapes are relatively regular; the overall shape of the 0.15mm-0.6mm grain size particles is poor, and the HLY and XWY shapes are worse than HGY and SHY. Adjust the operating parameters of the sand making machine according to the lithology to improve the particle size morphology.

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Abstract

The invention discloses a method for testing and analyzing morphology characteristics of machine-made sand, and relates to the field of concrete. According to the method, the morphology characteristics of the machine-made sand are tested and analyzed, qualitative or quantitative data of the morphology characteristics of the particles of each size fraction of the machine-made sand under the technological parameters of the specially-made sand can be obtained, which has important reference value for optimization of the technological parameters of machine-made sand processing and design of concrete mix proportion, and provides certain reference for detection units to carry out related detection work about the machine-made sand. The method comprises the following steps of: performing a digitalimage processing method on machine-made sand particles with the particle sizes of 2.36-1.18 mm and 2.36-4.75 mm so as to test and analyze the roundness value of the particles.

Description

technical field [0001] The invention relates to the field of concrete, in particular to a method for testing and analyzing the shape characteristics of machine-made sand. Background technique [0002] Due to the scarcity of natural sand resources and driven by economic interests, excessive mining and excavation have occurred in many areas of our country. Excessive and disorderly mining has caused serious safety and environmental protection problems. Therefore, regarding the application of natural sand, the country and local governments have clearly stipulated the prohibition or restriction of mining. The development of new sand sources to meet the demand for engineering sand has become a development trend in the industry. The use of machine-made sand to replace natural sand as concrete fine aggregate has become become a trend. Manufactured sand is made from parent rock by mechanical crushing and screening, with a particle size of less than 4.75mm, but excluding rock particl...

Claims

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Application Information

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IPC IPC(8): G01N15/02
CPCG01N15/02G01N15/0205G01N2015/0294
Inventor 钟国才严捍东钟明云李文科唐忠国
Owner 重庆富普新材料有限公司
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