Proportion design method for SMA (stone mastic asphalt) mixture

A design method and mixture technology, which is applied in the field of road and bridge engineering, can solve the problems of unstable SMA mixture quality, hindering the large-scale application of SMA, and uneven distribution of fiber agglomeration, so as to simplify the mixing production process and reduce asphalt smoke Emissions and the effect of improving economy

Active Publication Date: 2016-11-09
HEBEI PROVINCIAL COMM PLANNING & DESIGN INST
View PDF4 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of above-mentioned analysis, the present invention aims to provide a kind of proportioning design method of SMA compound, does not add fiber in this SMA compound, solves the uneven quality of fiber in the existing SMA compound,

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Proportion design method for SMA (stone mastic asphalt) mixture
  • Proportion design method for SMA (stone mastic asphalt) mixture
  • Proportion design method for SMA (stone mastic asphalt) mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The embodiment of the present invention provides a method for designing the ratio of SMA mixture, comprising the following steps:

[0041] Step 1: adjust the proportion of mineral material, and select 3 preliminary test gradations with different thicknesses from the primary selection gradation range in Table 1, and the preliminary test gradation is as shown in Table 2;

[0042] Table 1 Primary grading range

[0043]

[0044] Table 2 Primary gradation

[0045] Sieve hole(mm)

16

13.2

9.5

4.75

2.36

1.18

0.6

0.3

0.15

0.075

1# Grading

100

89.7

63.9

30.3

24.1

20.3

14.5

13.2

11.9

11.4

2# Grading

100

90

64.7

28.7

22.3

19.1

14

12.9

11.7

11.2

3# Grading

100

90.8

67.3

26.5

19.7

17.2

13.2

12.4

11.5

11.1

[0046] Step 2: Calculate the theoretical minimum asphalt ratio according to the following formula with the target void rat...

Embodiment 2

[0059] The embodiment of the present invention provides a kind of SMA mixture, comprises: the SBS modified asphalt (I-D) of 1 weight part, the aggregate of 16.07 weight parts, the limestone mineral powder of 1.79 weight part (asphalt ratio=SBS modified asphalt / (set material+limestone slag)=5.6%) and 0.005 parts by weight of Evotherm M1 surfactant; wherein the aggregate is taken from the basalt produced in Chengde, Hebei, and the gradation is shown in Table 4.

[0060] The SMA mixture is prepared by the following method: Step 1: take a certain amount of SBS modified asphalt, take by weighing 0.5% surfactant with the weighed amount of the SBS modified asphalt (I-D) and add to the Stir in the SBS modified asphalt for 5 minutes, and then place it in an oven at 165°C for drying for later use; Step 2: Take the aggregate that is 16.07 times the weighted amount of the SBS modified asphalt described in step 1 and dry it at 155°C Keep the temperature in the dry box for 4 hours, then add...

Embodiment 3

[0064] The embodiment of the present invention provides a kind of SMA mixture, comprises: the SBS modified bitumen (I-D) of 1 weight part, the aggregate of 16.43 parts by weight, the limestone mineral powder of 1.43 parts by weight (asphalt ratio=SBS modified bitumen / (set Material+limestone ore powder)=5.6%) and the Evotherm M1 surfactant of 0.006 weight part;

[0065] The SMA mixture is prepared by the following method: Step 1: take a certain amount of SBS modified asphalt, take by weighing 0.6% surfactant with the weighed amount of the SBS modified asphalt (I-D) and add it to the Stir in the SBS modified asphalt for 10 minutes, and then place it in an oven at 155°C for drying for later use; Step 2: Take the aggregate that is 16.43 times the weighted amount of the SBS modified asphalt described in step 1 and dry it at 145°C Keep the temperature in the dry box for 4 hours, then add it to the mixing pot at 145°C and dry mix it for 90s; Step 3: Add the asphalt prepared at consta...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a proportion design method for an SMA (stone mastic asphalt) mixture. The proportion design method comprises the following steps: selecting initial testing graduation; calculating a theoretically minimum asphalt-aggregate ratio; determining a maximum asphalt-aggregate ratio; selecting an initial testing asphalt-aggregate ratio; selecting graduation according to the initial testing asphalt-aggregate ratio; determining optimal asphalt-aggregate ratio according to the selected graduation. According to the method, a range of the asphalt-aggregate ratio is obtained through theoretical calculation and testing, the initial testing asphalt-aggregate ratio is determined, the selected graduation is determined from three initial testing graduations, and the optimal asphalt-aggregate ratio is determined according to the selected graduation. The SMA mixture is not doped with fibers, so that the stability of the mixture, the economic efficiency and environmental protection property of construction and the production efficiency are improved.

Description

technical field [0001] The invention relates to the technical field of road and bridge engineering, in particular to a ratio design method of SMA mixture. Background technique [0002] As a high-performance asphalt pavement material, SMA (asphalt mastic macadam mixture) is widely used at home and abroad based on its excellent anti-skid performance, high anti-rutting performance and durability. The traditional SMA mixture is a kind of asphalt mixture composed of asphalt, fiber stabilizer, mineral powder and a small amount of fine aggregate, which fills the skeleton gap of the discontinuously graded coarse aggregate with asphalt mastic. The primary function of fibers in SMA is to absorb and stabilize asphalt, which can reduce the dripping, leaking, and loss of asphalt binder during the mixing, transportation, and paving of SMA asphalt mixture, thereby avoiding the mixing of high asphalt content The material produces segregation and oil flooding, so the fiber has been consider...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C04B26/26
CPCC04B26/26C04B14/28C04B14/02
Inventor 朱冀军闫涛郭晓华王笑森张永利韩芳张卫焦彦利
Owner HEBEI PROVINCIAL COMM PLANNING & DESIGN INST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap