Determination method for bulk density and clearance rate of coarse aggregates

A technology of bulk density and measurement method, which is applied in the field of measurement of bulk density and interstitial ratio of coarse aggregate, can solve the problems of difficult unification and identification, and achieve the effects of stable data, easy unification of standards, and small variability

Active Publication Date: 2015-04-22
SOUTHEAST UNIV
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Problems solved by technology

"Practical operation found that the standard is difficult to identify and difficult to unify

Method used

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  • Determination method for bulk density and clearance rate of coarse aggregates
  • Determination method for bulk density and clearance rate of coarse aggregates
  • Determination method for bulk density and clearance rate of coarse aggregates

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Embodiment 1

[0091] The assay method of the present invention has obtained good experimental verification. The bulk density of the coarse aggregate and the skeletal void ratio of the coarse aggregate in the compacted state are measured by the method in the current specification and the method of the present invention respectively.

[0092] The instruments and materials needed in this embodiment include: (1) balance (sensitivity is not greater than 0.1% of weighing); (2) 5L capacity cylinder; (3) flat-headed shovel; (4) oven (capable of temperature control 105 ℃ ± 5°C); (5) Vibrating table (frequency 3000 times / min±200 times / min, amplitude under load is 0.35mm, amplitude under no load is 0.5mm); (6) Tamping rod (diameter 16mm, length 600mm steel rod with a round head at one end); (7) 1000mL beaker; (8) basalt as coarse aggregate.

[0093] The gross bulk density and apparent density of coarse aggregates were determined according to the method in T 0308 Test Procedure 05 of "JTG E42-2005 Hig...

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Abstract

The invention discloses a determination method for the bulk density and clearance rate of coarse aggregates. Firstly, sampling is carried out, a capacity barrel is selected, the mass of the capacity barrel is measured, the coarse aggregates are contained in the capacity barrel, operation is carried out according to different states of the coarse aggregates needing determining, the total mass of the capacity barrel and the coarse aggregates is obtained by weighing, then water is injected into the capacity barrel, the total mass of the capacity barrel, the coarse aggregates and the water is obtained by weighing, and finally the bulk density and clearance rate of the coarse aggregates are calculated according to measured data and a derived formula. The method can improve the accuracy and stability of measurement of the bulk density and clearance rate of the coarse aggregates, is of great importance in obtaining the accurate clearance rate of the coarse aggregates under the cement concrete compaction state and the clearance rate of a coarse aggregate skeleton under the bituminous mixture compaction state and then provides important help for judging whether an asphalt mastic macadam mixture skeleton stone-to-stone structure is formed or not.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and specifically relates to a method for measuring bulk density and interstitial ratio of coarse aggregate, which can be applied to measure bulk density (including natural bulk density, tapped density and tamped density) of coarse aggregate. The gap ratio under the aggregate vibration state and the gap ratio under the compacted state of the coarse aggregate skeleton. Background technique [0002] Bulk density refers to the mass per unit volume measured after the material is filled in a container in a certain way. According to different filling methods, it can be divided into natural bulk density, tapped density, and tamped density. The bulk volume of a material includes the internal pores of the material and the interstices between particles. Determination of packing density is an essential link for calculating the void ratio under different packing states. [0003] Coarse aggregate is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N9/02G01N5/00
Inventor 马涛陈呈陈田张垚赵晨
Owner SOUTHEAST UNIV
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