Overview
ABSTRACT
The hydraulic road binders or HRBs were developed, along with standardized cements for the treatment of soils in a place or plant, the elaboration of materials for pavement subbases and the in-place cold retreatment of old roadways. These composite binders are obtained by mixing and/or grinding clinker and industrial co-products and they present certain advantages, in particular at the technical and economic level. Although the components of the hydraulic binders are quite similar to those of cements, their proportions vary which give them a rather close phenomena of that of hydraulic setting with however specific kinetics.
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Joseph ABDO: Doctorate in engineering from the École des Mines de Paris and engineer from the École Nationale des Ponts et Chaussées - Vice President, Roads, Cimbéton, Paris
INTRODUCTION
In addition to standardized cements, the 1980s saw the development of binders known as "road hydraulic binders" (LHR), specially developed for in-place or central soil treatment, for the production of road base materials and for cold in-place recycling of old pavements.
These are composite binders obtained by mixing and/or grinding clinker or industrial by-products (slag, pozzolans, fly ash, etc.).
The principles of action of hydraulic road binders are not fundamentally different from those of cements, since they contain the same constituents, albeit in different proportions, and thus hydraulic setting phenomena of the same nature, but most often with specific kinetics.
Hydraulic road binders are covered by two European standards:
NF EN 13282-1 "Rapid kinetic hydraulic road binders – Composition, specification and conformity criteria";
NF EN 13282-2 "Normal kinetic hydraulic road binders – Composition, specification and conformity criteria".
These binders have become increasingly popular in recent years, as they offer a number of technical and economic advantages. We'll take a closer look in this dossier.
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