A rodavel is traditionally made of mud and wattle. But tradition was by-passed when concrete accommodations fro Hilton International clientele were needed at wild game viewing base called Salt Lick Lodge in Kenya, Africa. Rondavels which simulate the traditional ones but are made of concrete were created to provide a quasi-native environment conductive to a guest's enjoyment of being on safari. A further plus for the concrete rondavels is their invulnerability to the insect attack and nesting to which mud and wattle rondavels are subject. The idea for this type of concrete structure was developed by architect J. A. Williams and structural engineers John Burrow and Partners to solve the problem of producing hotel lodgings that would have a high standard of comfort and yet create no conflict with the native environment. A form of construction known as stack sack was used for the construction of the bedroom unit and circular main building of the Lodge. This system as also used in another nearby luxury lodge to build a swimming pool, the bedroom portions and other elements. To readers unfamiliar with the stack sack system, the procedure for its use is just as the name implies; stack sack. In Kenya, locally made burlap sacks 6 inches in diameter by about 3 feet in length were filled with a dry concrete mix containing a graded three-fourth of an inch maximum size aggregate, sand and cement, giving a cement to aggregate ratio of between 1:10 and 1:12. The mix was hand packed into the sacks and compacted by several bouncing on the ground. When the sacks were full the open ends were sewn shut and stacked ready for use. Just prior to placing them in the structure, the sacks of dry material were immersed briefly in a trough of water, then laid one course thick with vertical joints staggered to create a bond. Short lengths of one-fourth of an inch diameter steel rods were hammered vertically through the sacks at approximately 3 foot centers.