LT6724B - Asphalt mixture for the noise of light transport traffic predominance reducing pavement - Google Patents

Abstract

The present invention relates to the construction industry, and more specifically to asphalt mixtures, which are subject to increased requirements for noise reduction and durability. The object of the invention is to provide a mixture of asphalt with good acoustic, mechanical and operational properties, for the pavements reducing the noise of predominance of light transport traffic. Asphalt mixture for the noise of the light transport traffic predominance reducing pavement consisting of a mixture of fillers comprising fractionated rubble and mineral powder, adhesion enhancer, cellulose fiber and polymer modified bitumen, characterized in that the mixture of fillers consists of 2 to 5 mm granite rubble, as well as 0 to 2 mm granite rubble separated by sieving and mineral powder, with a component ratio by weight %: 2-5 mm granite rubble fraction - 75.0-86.0; 0-2 mm granite rubble separated by sieving - 7.0-14.0; mineral powder - 1.0-5.0; adhesion enhancer - 0.01-0.03; cellulose fiber - 0.30-0.60; bitumen - 5.0-6.5.

Description

The invention belongs to the field of construction industry, more precisely to asphalt mixtures, which are subject to increased requirements for the level of noise reduction and durability.

There is a known asphalt mixture with an air voids content of 25.0 - 30.0%, a bitumen content - the particle size distribution of the aggregate mixture is% by weight: leaching through an 8.0 mm sieve 100.0%, leaching through 4.0 mm mesh size sieve 85.0 - 95.0% and spread through a 0.063 mm mesh sieve 5.5 - 7.0% (see Frederic Loup, Serge Krafft, Jerome Dherbecourt. NANOPHONE®: Innovative open-graded asphalt concrete 0- 4 mm for improving noise reduction.5 ^th Eurasphalt & Eurobitume Congress, 13-15th June 2012, Istanbul, Turkey). The disadvantages of this asphalt mix are the underestimated sensitivity to water and the resistance to rutting.

An asphalt mixture is also known in which the particle size distribution of the aggregate mixture is in the range of% by weight: leaching through an 11.2 mm mesh sieve 100%, leaching through an 8.0 mm mesh sieve 99.8%, leaching through 5.6 mm mesh sieve size 97.7%, passage through a sieve with a mesh size of 4,0 mm 92,2%, passage through a sieve with a mesh size of 2,0 mm 35,1%, passage through a sieve with a mesh size of 1,0 mm 24,4%, through a 0.5 mm sieve 19.5%, through a 0.25 mm sieve 15.0%, through a 0.125 mm sieve 10.5%, through a 0.063 mm sieve 7.6% . Road bitumen 50/70 makes up 5.4% of the total weight of the asphalt mix, (see Martin Sychra. Vliv obsahu pojiva na vlastnosti asfaltovė sandė s CRMB. Vysokė učeni technickė v Brnė, fakulta stavebni Ustav pozemnich komunikaci, Diplomova prace, 2016). The disadvantages of this asphalt mix are the unmodified bitumen used, the rust resistance of the asphalt mix, the average profile depth and the average texture depth have not been evaluated.

The nearest composition of the asphalt mix is a mixture of aggregates from 70.5% fractionated chippings 2-4 mm, 23.0% sieves 0-4 mm and 6.5% mineral powder. Road bitumen 50/70 makes up 6.0% of the total weight of the asphalt mix. The granulometric composition of the aggregate mixture of this asphalt mixture in% by weight is: leaching through a sieve with a mesh size of 8.0 mm 100.0%, leaching through a sieve with a mesh size of 4.0 mm 89.8%, leaching through a sieve with a mesh size of 2.0 mm 25 , 1%, passage through a sieve with a mesh size of 1,0 mm 19,5%, passage through a sieve with a mesh size of 0,5 mm 16,2%, passage through a 0,25 mm sieve 13,2%, passage through a 0,125 mm sieve mesh size sieve 9.6%, and spread through a sieve with a mesh size of 0.063 mm 7.0% (see Ondfej Kubanek. Problems in tenkovrstvych asfaltovych kobercū. Vysokė učeni technickė v Brnė, fakulta stavebni Ustav pozemnich komunikaci, 2015).

The prototype has a relatively low resistance to water (the best result is the water sensitivity value ITSR = 60.61%) and the resistance to rutting has been assessed at an insufficiently high temperature (rutting resistance tests were performed at 50 ° C). In addition, the average depth of the profile and the average depth of the texture are not estimated.

The aim of the invention is to create an asphalt mixture that reduces the dominance of light traffic traffic and has good acoustic, mechanical and operational properties.

This object is achieved by the fact that the composition of the noise-reducing asphalt mixture includes a mixture of aggregates from fractionated chippings and mineral powders, an adhesion promoter, cellulose fiber and polymer-modified bitumen in a weight ratio of components of:

- 5 mm granite chippings fraction - 75.0-86.0;

- 2 mm granite chippings - 7.0 -14.0;

mineral powder - 1.0 - 5.0;

adhesion promoter - 0.01 - 0.03;

cellulose fiber - 0.30 - 0.60;

bitumen - 5.0 - 6.5.

The object is also achieved in that the particle size distribution of said mixture of aggregates is% by weight:

spreading through a 0.063 mm sieve - 3.0 - 8.0;

spreads through a 0.125 mm sieve - 4.0 - 9.0;

spills through a 0.250 mm sieve - 5.0 -10.0;

spillage through a 0.5 mm sieve - 6.0 -12.0;

spreading through a 1.0 mm sieve - 7.0 -13.0;

spreads through a 2.0 mm sieve -11.0-18.0;

spreads through a 5.6 mm sieve - 85.0 - 100.0;

spread through a 8.0 mm sieve - 100.0.

Optimal amounts of components in the noise-reducing asphalt mix were determined by experimental studies. The project was funded by the Lithuanian Science Council (LMTLT), contract no. S-MIP-17-137.

The invention provides an asphalt mixture for a noise-reducing pavement for light traffic traffic is illustrated by examples.

an example of a noise-reducing asphalt mix

The composition of the noise-reducing asphalt mixture in% by mass is as follows:

- 5 mm granite chippings fraction - 78.97;

- 2 mm granite chippings screenings -11.16;

mineral powder - 3.65;

adhesion promoter - 0.02;

cellulose fiber - 0.40;

bitumen PMB 25 / 55-60 - 5.90.

an example of a noise-reducing asphalt mix

The composition of the noise-reducing asphalt mixture in% by mass is as follows:

- 5 mm granite chippings fraction - 81.24;

0-2 mm granite chippings - 10.29;

mineral powder - 2.55;

adhesion promoter - 0.02;

cellulose fiber - 0.30;

bitumen PMB 45 / 80-65 - 5.50.

The physical and mechanical properties of the asphalt mix for the noise-reducing pavement of light traffic are presented in Table 1.

table

Feature Standard Set value Example 1 Example 2 Apparent density of asphalt samples, Mg / m ³ LST EN 12697-6, 9.4 p. 2,240 2,180 Maximum density of asphalt samples, Mg / m ³ LST EN 12697-5 2,571 2,575 Emptiness rate of asphalt samples,% LST EN 12697-8 12.9 15.4 Water sensitivity,% LST EN 12697-12 81.4 80.5 Stiffness, MPa LST EN 12697-26 3220.0 3170.0 Track formation speed WTS _MR (10000 cycles, 60 ° C, load - 1.52 kN),% LST EN 12697-22, small device, procedure B in air 0.1 0.2 Depth of macrotexture, mm LST EN 13036-1 0.8 1.0 Average profile depth, mm ISO 13473-1 0.7 0.9

The developed asphalt mixture has good acoustic, mechanical and performance properties.

The asphalt mix can be applied to the installation of asphalt wearing course on streets, roads and other traffic areas according to the relevant operating and traffic conditions.

Claims (2)

DEFINITION OF THE INVENTION 1. Asphalt mixture for light traffic noise reduction, comprising a mixture of aggregates of fractionated chippings and mineral powder, an adhesion promoter, cellulose fiber and polymer-modified bitumen, characterized in that the aggregate mixture consists of a fraction of 2 to 5 mm of granite chippings , as well as 0 - 2 mm granite chippings and mineral powder, the ratio of components in% by weight is: 2 - 5 mm granite chippings fraction - 75.0 - 86.0; 0 - 2 mm granite chippings - 7.0 -14.0; mineral powder - 1.0 - 5.0; adhesion promoter - 0.01 - 0.03; cellulose fiber - 0.30 - 0.60; bitumen - 5.0 - 6.5. 2. The asphalt mixture according to claim 1, characterized in that the particle size composition of said aggregate mixture is% by weight: spreading through a 0.063 mm sieve - 3.0 - 8.0; spreads through a 0.125 mm sieve - 4.0 - 9.0; spills through a 0.250 mm sieve - 5.0 -10.0; spillage through a 0.5 mm sieve - 6.0 -12.0; spreading through a 1.0 mm sieve - 7.0 -13.0; spreads through a 2.0 mm sieve -11.0-18.0; spreads through a 5.6 mm sieve - 85.0 - 100.0; spread through a 8.0 mm sieve - 100.0.