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Method for determining mineral aggregate gradation by using three control points hyperbolic structure

A technology for determining methods and control points, applied in chemical instruments and methods, grading, analyzing materials, etc., can solve the problems of not fully reflecting the gradation characteristics of raw materials and mineral materials, and small room for grading selection, and achieve clear and rapid grading optimization. selected effect

Active Publication Date: 2012-06-20
RES INST OF HIGHWAY MINIST OF TRANSPORT +1
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Problems solved by technology

[0033] The common feature of these methods is that a gradation curve is used to describe the composition law of each particle size. Because of this, the choice of gradation is small and cannot fully reflect the gradation characteristics of raw materials.

Method used

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  • Method for determining mineral aggregate gradation by using three control points hyperbolic structure
  • Method for determining mineral aggregate gradation by using three control points hyperbolic structure
  • Method for determining mineral aggregate gradation by using three control points hyperbolic structure

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Embodiment Construction

[0069] The present invention will be further described in detail below in conjunction with the embodiments.

[0070] This experiment takes 16-type mixture as an example, adopts the principle of skeleton break gradation, the pass rate of 16mm is 95%, the pass rate of 4.75mm is 30%, and the pass rate of 0.075mm is 7%. These three points are used as control points. The fine aggregate grading curve is calculated and generated by logarithmic function, power function and exponential function. According to the orthogonal experiment, the curves of different fine aggregates and coarse aggregates can be determined. In this technical scheme, only the influence of the change of the proportion of the coarse aggregate on the various indicators and performance is considered, and the fine aggregates of 4.75mm~0.075mm are unified Use power function generation. Establish fine aggregate gradation curve; 16mm~4.75mm coarse aggregate adopts logarithmic function model, power function model and expone...

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Abstract

The invention relates to a method for determining mineral aggregate gradation by using three control points hyperbolic structure. The method comprises the following steps of: (1) determining the following three control points according to the properties of a mixture: nominal maximum particle size of the mixture and pass rate thereof, nominal minimum particle size of the mixture and pass rate thereof, and coarse / fine aggregate discontinuous point nominal particle size and pass rate thereof; (2) making a coarse aggregate gradation curve and a fine aggregate gradation curve by selecting power function models, exponential function models and logarithmic function models respectively; and (3) measuring tamping density and tamped mineral aggregate clearance rate of the mixture, and adopting coarse aggregate gradation and fine aggregate gradation respectively according to construction needs. The method can select reasonable gradation forms according to the requirements for asphalt mixture design, can also selectively construct different gradation curve forms according to the characteristics of mixtures from different material sources in different areas, gives full play to performances and characteristics of mineral aggregates in the mixture, and is significant in guiding mixture design.

Description

Technical field [0001] The invention relates to a method for determining the gradation of asphalt mixtures in road engineering, in particular to a method for determining the gradation of mineral materials using a hyperbolic structure with three control points. Background technique [0002] The grading of minerals is composed of a variety of different sizes of minerals, and it is very complicated to determine a reasonable ratio between the various sizes of minerals in actual projects. Setting a gradation curve or grading range in advance, and then applying it to mineral materials of different particle sizes, is the starting point of the current commonly used mixture grading design. In this way, the technical characteristics of various mineral materials cannot be fully utilized, and the blindness of the grading design is also caused. [0003] For example, the Marshall compaction test was carried out using Beijing basalt, Hebei basalt, Sichuan rolled river pebbles and Guangdong grani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/26
CPCB07B13/18G06F17/10G01N9/36C08L95/00C04B26/26C08L2555/10C04B2111/0075C04B14/00
Inventor 王旭东傅琴张蕾刘奕周兴业李福建
Owner RES INST OF HIGHWAY MINIST OF TRANSPORT
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