USE OF RESIN MODIFIED PAVEMENT

CEMP)ET

DEPARTMENT OF THE ARMY

ETL 1110-1-177

U.S. Army Corps of Engineers

Washington, D.C. 20314)1000

Engineer Technical

Letter 1110-1-177

31 December 1996

Engineering and Design

USE OF RESIN MODIFIED PAVEMENT

1. Purpose. This letter provides state-of-the-art guidance on

the design and use of resin modified pavement (RMP).

2. Applicability. This Engineer Technical Letter (ETL) is

applicable to all HQUSACE elements and USACE Commands having

military and civil works construction responsibility.

3. References. References providing necessary general

information, background, definitions and design guidance for

resin modified pavements are listed in Appendix A.

Discussion.

4.

a. Description. Resin modified pavement (RMP) is a

composite pavement surfacing that uses a unique combination of

asphalt concrete (AC) and portland cement concrete (PCC)

materials in the same layer. The RMP material is generally

described as an open-graded asphalt concrete mixture containing

25- to 35-percent voids which are filled with a resin modified

portland cement grout. The open-graded asphalt mixture and resin

modified cement grout are produced and placed separately. The

open-graded mixture is produced in a typical asphalt concrete

plant and placed with standard asphalt paving equipment. After

the open-graded layer has cooled, the grout is poured onto the

porous surfacing and vibrated into the internal voids. The RMP

layer is typically 50 mm (2 in.) thick and has a surface

appearance similar to a rough-textured PCC.

b. Materials and Construction. The open-graded asphalt

mixture is designed to be the initial "skeleton" of the RMP. A

coarse aggregate gradation with very few fines is used along with

a low asphalt cement content (typically 3.5 to 4.5 percent by

total weight) to produce 25- to 35-percent voids in the mix after

construction. The open-graded asphalt mixture can be produced in

a conventional batch plant or drum-mix plant. After placing, the

open-graded asphalt material is smoothed over with a minimal

number of passes (usually 2 or 3) from a small (3-tonne maximum)

steel-wheel roller.

(1) The resin modified cement grout is composed of fly ash,

silica sand, cement, water, and a cross polymer resin additive.

The resin additive is generally composed of five parts water, two

parts polymer resin of styrene and butadiene, and one part

water-reducing agent. The grout water/cement (w/c) ratio is