High-performance coated material for pavement and a road surface

摘要

The invention relates to coated material for the base layer of road pavement, made up of aggregate coated with a hydrocarbon binder, wherein the aggregate is more than 95 wt % of the coated material; wherein the aggregate includes a granular structure, which includes a plurality of granular fractions d/D; one intermediate fraction of which is less than 15% of the granules; wherein the hydrocarbon binder is less than 5 wt % of the coated material; wherein the coated material includes, after compacting, a void fraction of less than 8%; wherein the hydrocarbon binder is a hydrocarbon binder modified by adding polymers or oil, or modified by foaming or by emulsion, by means of which the modulus of rigidity of the coated material, once compacted, is higher than 9000 MPa.

主权项

1. A coated material for a base layer or binder layer of a road or highway pavement, or for industrial, port, or airport platforms, or for a supporting layer for railroad tracks,
wherein said coated material is composed of aggregate mixed with at least one hydrocarbon binder, wherein the aggregate represents more than 95% by weight of the coated material, and the hydrocarbon binder represents at most 5%, wherein the aggregate comprises a granular structure comprising several particle size fractions d/D, each particle size fraction being defined by a lower limit (d) and an upper limit (D), wherein the aggregate comprises a first particle size fraction d1/D1 having as median a first median dm1, and a second particle size fraction d2/D2 having as median a second median dm2, wherein the aggregate comprises a third particle size fraction d3/D3 between the first and second particle size fractions, having as lower limit d3 the upper limit D1 of the first particle size fraction, and having as upper limit D3 the lower limit d2 of the second particle size fraction, wherein the third particle size fraction has a ratio (P3) of its weight relative to the weight of the aggregate, wherein the width of the third particle size fraction D3−d3, defining a relative width (D3−d3)/D2 in relation to the upper limit (D2) of the second particle size fraction, said relative width being greater than 20% of D2, wherein the ratio of the weight ratio (P3) of the third particle size fraction and its relative width is less than 0.4, which is:P⁢⁢3(D⁢⁢3-d⁢⁢3)/D⁢⁢2⩽0.4by means of which the number of contacts between the particles of the second particle size fraction d2/D2 is maximized,
wherein the coated material comprises, after compacting, a void content of less than 10%, wherein the hydrocarbon binder is a hydrocarbon binder modified by inclusion of polymers and/or oil, and/or treated by blowing and/or treated by foaming or by emulsion,by means of which the modulus of rigidity of the coated material, once compacted, is greater than 9000 MPa at a temperature of 15° C. and at a frequency of 10 Hz, and the fatigue resistance of the coated material, once compacted, is greater than 90 microstrain at a temperature of 10° C. and at a frequency of 25 Hz.