Showing papers on "Pervious concrete published in 1975"
TL;DR: The authors showed that low permeability concrete is highly durable to sulfate attack; however, more permeable concrete is more susceptible to sulfates attack, however, large concrusted concrete is susceptible to more sulfates.
Abstract: Concrete submerged for 67-yr in seawater has shown that low permeability concrete is highly durable to sulfate attack; however, more permeable concrete is susceptible to sulfate attack. Large concr...
19 citations
Patent•
19 Sep 1975
TL;DR: The water-permeable concrete is suitable for underwater constructions exposed to pressure of underground waters such as walled canals, coast strengthening constructions, etc..
Abstract: Materials for underwater constructions, contg. fillers such as cement, gravel or the like and a binder such as cement, or cement-lime are improved in that the filler particles show irregular size distribution so that pores are formed in the resulting concrete rendering it water-permeable. The compsn. pref. contains 0.05-30.00 wt. % (w.r.t. the water) of a polymeric addition, pref. a cellulose ether, polyacrylamide or polyethylene oxide. Alternatively it may contain 0.08-2.5 wt. % (w.r.t. the water) of an alginate or casein. This water-permeable concrete is suitable for underwater constructions exposed to pressure of underground waters such as walled canals, coast strengthening constructions, wells. etc. Water penetrated into the concrete and the pressure is relieved. The addition of polymers improves the strength of the concrete, esp in early stages so that it can be moulded in situ under water, it also improves the erosion resistance, esp. in sailing canals and coastal structures. The water retention capability is increased.
8 citations