Concrete pavement structure comprising a concrete base layer and an elastomer improved concrete wearing layer
A concrete pavement structure includes a base layer directly coated by a wearing layer, wherein the base layer is a concrete base layer and the wearing layer is an elastomer modified pervious concrete layer, having a thickness below to 4 cm, a void content ranging from 5% to 20% in volume, and a maximal diameter of aggregates present in the polymer modified pervious concrete layer is 10 mm.
1. A concrete pavement structure comprising a base layer directly coated by a wearing layer, wherein the base layer is a concrete base layer and the wearing layer is an elastomer modified pervious concrete layer, having a thickness less than 4 cm, a void content ranging from 5% to 20% in volume, and a maximal diameter of aggregates present in said elastomer modified pervious concrete layer is 10 mm.
2. The concrete pavement structure of claim 1 , wherein the elastomer modified pervious concrete layer has a friction coefficient, measured by Wehner & Schulze method, μWS, above 0.32, at 180,000 polishing cycles.
3. The concrete pavement structure of claim 1 , wherein the concrete base layer is an undowelled pavement, jointed plain concrete pavement, jointed reinforced concrete pavement, continuously reinforced concrete pavement, or a low cost base layer.
4. The concrete pavement structure of claim 1 , wherein the concrete base layer directly coated by the elastomer modified pervious concrete layer has compressive strength, at 28 days, above 20 MPa.
5. The concrete pavement structure of claim 1 , wherein the set concrete base layer directly coated by the elastomer modified pervious concrete layer has flexural resistance strength, at 28 days, above 8 MPa.
6. The concrete pavement structure of claim 1 , wherein the tensile bond strength between concrete base layer and elastomer modified pervious concrete layer is above 2.5 MPa.
7. The concrete pavement structure of claim 1 , wherein the void content of the elastomer modified pervious concrete ranges from 5% to 10%, in volume.
8. The concrete pavement structure of claim 1 , wherein the elastomer modified pervious concrete comprises, by m 3 of fresh pervious concrete
from 220 to 380 kg of a hydraulic binder;
from 86 to 148 liters of water, the mass ratio weight of water/weight of hydraulic binder ranging from 0.3 to 0.5;
from 1210 to 1720 kg of coarse aggregates having a diameter from 1.6 mm to 10 mm;
from 30 to 520 kg of crushed or natural fine aggregate having a diameter from 0 mm to 2 mm;
wherein all aggregates have maximal diameter, Dmax, equal or below 10 mm; and
an elastomer.
9. The concrete pavement structure of claim 1 , wherein, in the elastomer modified pervious concrete, coarse aggregates having a diameter from 1 mm to 10 mm and crushed sand having a diameter from 0 mm to 1 mm constitute from 80% to 100% by mass of all the aggregates.
10. The concrete pavement structure of claim 1 , wherein the elastomer modified pervious concrete comprises a superplasticizer.
11. The concrete pavement structure of claim 1 , wherein the elastomer is introduced under the form of a latex.
12. The concrete pavement structure of claim 10 , wherein the elastomer is a copolymer of vinyl acetate-ethylene-(meth)acrylic acid esters.
13. The concrete pavement structure of claim 1 , wherein, in the elastomer modified pervious concrete, the hydraulic binder is any ordinary Portland cement, CEM I, CEM II, CEM III, CEM IV, or CEM V as defined in the cement standard EN 197-1.
14. The concrete pavement structure of claim 1 , wherein the concrete base layer is a roller compacted concrete.
15. A process for manufacturing a concrete pavement structure of claim 1 , comprising directly depositing the elastomer modified pervious concrete layer on the concrete base layer before the hardening of said concrete base layer.
16. A road comprising the concrete pavement structure of claim 1 .
17. A method for improving skid resistance of a pervious concrete layer comprising using an elastomer present in the pervious concrete layer and forming the elastomer modified pervious concrete layer in the concrete pavement structure of claim 1 .
18. The concrete pavement structure of claim 1 , wherein the low cost base layer is a Roller-Compacted Concrete or other low-cost slip-formed concrete.
19. The concrete pavement structure of claim 8 , wherein the elastomer modified pervious concrete comprises, by m 3 of fresh pervious concrete from 350 to 380 kg of a hydraulic binder.
20. The concrete pavement structure of claim 9 , wherein, in the elastomer modified pervious concrete, coarse aggregates having a diameter from 1 mm to 10 mm and crushed sand having a diameter from 0 mm to 1 mm constitute from 90% to 100% by mass of all the aggregates.
21. The concrete pavement structure of claim 10 , wherein the elastomer modified pervious concrete comprises a superplasticizer in content up to 5% by weight, on the basis of the hydraulic binder weight.
22. The concrete pavement structure of claim 11 , wherein latex is styrene butadiene rubber emulsion, neoprene emulsion, acrylic acid emulsion, acrylate emulsion, styrene-acrylate emulsion, vinyl acetate-ethylene emulsion, acrylate-ethylene-vinyl ester emulsion, or mixture or two or more of said emulsions.
23. The road of claim 16 , wherein the road is a highway.