The research objective was to assess the permeability of concrete made with porous limestone and non-porous aggregates. Fifty-eight concrete mixes were made and tested to study the effects of fly ash, silica fume, and aggregate type on the permeability of concretes. Class F fly ash and silica fume were used at the levels of 10 to 50 %, and 5 to 20 % as cement replacement on weight basis, respectively. Nine different aggregates, seven in-states and two out-of-states, were collected to study the effects of aggregate type. The test results indicated that silica fume may cause considerable effects on both water and rapid chloride permeability of concrete, while the initial and prolonged moist curing was found essential for the fly ash concrete. In addition, the permeability of aggregate was positively affecting the permeability of concrete. The concretes mixed with aggregates of low permeability showed lower water permeability than those made with porous aggregates. The effect of the permeability of aggregate was also noticeable when the water cementitious material ratio (w/cm) of concrete was high. At lower w/cm ratio, the bond at the cement paste-aggregate interface reduced the effect of the permeability of aggregate.

As part of research to develop a highly durable concrete container for radioactive waste disposal in chloride and sulfate bearing granite groundwaters, a variety of cement pastes were studied. A sulfate resisting portland cement was used with various replacement levels of Class F fly ash and pelletized blast furnace slag at a water to solids ratio (W/S) = 0.36. Blends with fly ash, slag, and silica fume were also combined with a super water reducer at W/S = 0.25. Results are presented for strength development, permeability to water, and pore size distribution after 7, 28, 91, and 182 days moist curing. As a direct measure of durability, after 91 days moist curing, paste prisms were immersed in both de-ionized water and a synthetic chloride and sulfate bearing groundwater at 70°C.

Combines in one volume "Technics and Language", in which anthropologist Leroi-Gourhan looks at prehistoric technology in relation to the development of cognitive and liguistic faculties, and "Memory and Rhythms", which addresses instinct and intelligence from a sociological viewpoint.