Civil engineer guide to fighting positions, shelters, obstacles

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AFH 10-222 Volume 14 1 August 2008 116 5.6. Precast Concrete Wall. The portable precast concrete wall consists of a wall section with two notches that fit into two separate, notched footings of precast concrete (Figure 5.19). This type of revetment can be from 5 to 15 feet high, 6 feet wide, and 6 inches thick. The freestanding units can be butted together side-by-side and at 90-degree corners; they can also be enhanced with berms. Additional details on constructing and erecting precast concrete wall revetments can be downloaded from TCMS. Figure 5.19. Precast Concrete Wall.
AFH 10-222 Volume 14 1 August 2008 117 5.7. Soil-Cement Revetments. Soil-cement revetments provide greater protection from fragmentation and require less surface area than earthen berms (Figure 5.20). The walls of these revetments can be constructed with a 10:1 vertical-to-horizontal slope with a crest at least two feet thick. However, be aware that formwork and proper mixing equipment are required for construction. Depending on the wall’s height, the foundation may require a higher bearing capacity than a soil berm and may have to be improved with a mixture of cement. In addition, walls with significant heights may need to be built in several lifts. If possible, build the formwork strong enough to allow forming in one or two lifts. If lifts are used, consider using some form of doweling between the lifts. The amount of water needed to moisten the mixture and allow cement hydration and the ratio of cement-to-soil (by weight) will vary based on soil type. Generally, 1-part Portland cement to 10 parts soil is used for soil-cement construction. Figure 5.20. Soil-Cement Revetment.
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Civil engineer guide to fighting positions, shelters, obstacles

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