High-ductility polymer-rubber powder-honey-combed cement concrete road covering material and construction process thereof

Abstract

Disclosed is a cover material of polymer modification rubber powder porous concrete with high toughness and a making technique thereof. Wherein, in per cubic meter of the concrete, the polymer is 20 to 75 kg, the cement is 200 to 400 kg, and the water to cement ratio is between 0.25 to 0.40 ; in aggregates, the amount of a fine aggregate is less than or equal to 20 percent, and the amount of a coarse aggregate is more than or equal to 80 percent; 0 to 5 kg of plasticizer and / or defoamer are / is added; rubber powder, whose volume fraction is not more than 50 percent, is used to replace the natural aggregate ; or the cement is replaced by mineral admixtures which are not more than 40 percent. The cover material is made by a small machine, a three-roller and an asphalt paver. The main technical parameters of the cover material are as follows: compressive strength is more than or equal to 15 MPa, flexural strength is more than or equal to 5 MPa, anti-skid structure depth is more than or equal to 2.0 mm, porosity is 18 to 22 percent, permeability coefficient is more than or equal to 1.5 mm / s, sound absorption coefficient is more than or equal to 0.30, and noise reduction effect is more than or equal to 5 dB. The cover material can comprehensively utilize the discarded rubber with the advantages of high toughness, sliding resistance and sound absorption and noise reduction. Thus, the cover material is applicable to the covers of the highway, the municipal road and the flat.

Description

technical field [0001] The invention belongs to building materials, in particular to a high-toughness polymer-rubber powder-porous cement concrete road overlay material and a construction process. Background technique [0002] At present, the overlay materials of high-grade highways mainly include cement concrete and asphalt concrete. The cement concrete overlay has the advantages of convenient material acquisition, simple construction, high pavement strength, good stability, and good durability, but it has poor driving comfort, poor coordination between the overlay and the underlying structure, and is prone to damage due to joints , Noisy and other shortcomings. Asphalt concrete overlay has the advantages of flat surface, no joints, comfortable driving, wear resistance, small vibration, low noise, easy maintenance and repair, etc., but the strength and stiffness of the road surface are low, and it is easy to cause damage such as rutting, loose spalling, and reflection crac...

AI Technical Summary

Problems solved by technology

The cement concrete overlay has the advantages of convenient materials, simple construction, high pavement strength, good stability, and good durability. , loud noise and other disadvantages

The asphalt concrete overlay has the advantages of smooth surface, no joints, comfortable driving, wear resistance, small vibration, low noise, easy maintenance and repair, etc., but the strength and stiffness of the road surface are low, and it is easy to cause rutting, loose peeling, reflection cracks and other damages

[0003] Research on polymer modified porous cement concrete overlay materials has been carried out at home and abroad. The research shows that this type of material has good functions of sound absorption and noise reduction, water permeability and anti-skid, etc., but because the strength of porous concrete mainly depends on aggregate contact It is formed by the bonding effect of the slurry at the place, showing strong brittleness, and is easy to loose and peel off under the action of dynamic load. After polymer modification, its toughness and dynamic stability are obviously enhanced, but its brittleness coefficient (compression ratio Flexural strength) remains at about 0.3, further increasing the polymer can reduce the brittleness coefficient, but it will also reduce the compressive and flexural strength, and also greatly increase the cost of the material