B - Operations – Transporting – 28 – B
Patent
B - Operations, Transporting
28
B
117/163, 261/45
B28B 11/06 (2006.01) C04B 28/06 (2006.01) C04B 40/02 (2006.01) C04B 41/50 (2006.01) C04B 41/65 (2006.01) E04F 15/12 (2006.01) E04G 21/06 (2006.01)
Patent
CA 1186347
APSTRACT OF THE DISCLOSURE A method of treating the unset surface of Portland cement concrete to form thereon a hardened surface, that is an integral coating, skin, treatment or mass of high early compressive strength, without sub- stantial shrinkage during setting while exhibiting re- duced wet and dry volume changes in the hardened state and possessing a high degree of impermeability to fluids, abrasion, erosion and chemical resistance and similar characteristics desired in a surface treatment having commercial usefulness in a construction industry. The hardened surface is obtained by dry shaking, that is, sprinkling a dry cementitious composition of alumina cement and gypsum on the unset Portland cement concrete. Additional components, such as viscosity controllers, surface active agents, retarders, accelerators, wet expansion inhibitors, gas generating or gas releasing agents, fly ash, plasticizers, pigments, water retentiv- ity aids, fillers, and aggregates may be utilized to adjust the properties of the composition and impart selective improvement of specific properties.
404094
International Construction Products Research Inc.
Osler Hoskin & Harcourt Llp
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