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Military ground vehicles operate in a variety of harsh terrains that subject their undercarriages and coatings to serious corrosion risk from abrasion by dust and impacts by gravel and rocks. This type of damage occurs on U.S. military service roads on training lands and in overseas areas of operation. Current expedient construction methods for such roads can be improved to reduce vehicle corrosion hazards by developing naturally cementitious material blends that effectively stabilize native soils. This report describes field and laboratory tests of an alkali-activated natural cement blend containing no Portland cement, which is costly to procure and transport to the remote locations where expedient roads are missionrequired. The material, described as a roller-compacted chemically bound soil (RCCBS) technology, consists of local basalt aggregate from the demonstration site plus fly ash, imported lime, slag, and soda ash. This material was used to construct two small test slabs at a Hawaii Army installation using different paving equipment. Also, a quarter-mile road bed was prepared for a production-scale batch, but the demonstration could not be completed because the RCCBS flash-set in the batch mixer and was unusable. The project return on investment was zero, and RCCBS cannot be recommended for use. DISCLAIMER: The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. All product names and trademarks cited are the property of their respective owners. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents. DESTROY THIS REPORT WHEN NO LONGER NEEDED. DO NOT RETURN IT TO THE ORIGINATOR. ERDC/CERL TR-18-14 iii

Investigation of Natural Cementation to Mitigate Corrosion-Promoting Characteristics of Unsurfaced Roadways : Final Report on Project F10-AR06