Abstract: An expansion joint is described comprising a flexible, metal-free tubular connector having corners and sides, said connector joining the end of adjacent ducts, and with each corner comprising a central section and two expansion sections. As the expansion joint expands and contracts, the central and expansion sections of each corner extend and retract, changing in shape to accommodate the joint movement and to prevent stress concentrations at corners.

Abstract: A thermal shock resisting asbestos-cement composition is prepared by adding a finely divided porosity increasing additive as a partial or complete replacement for silica flour in an asbestos-cement composition containing asbestos fibers, portland cement, and silica flour. The composition is shaped and cured to form the final thermal shock resistant product.

Abstract: A process is provided for bonding otherwise incompatible resin systems to form laminated resinous articles. A first resin layer is coated with a solvated coating which forms a surface solution with the surface of the first layer. Thereafter, a second resin layer is bonded to the coating. The coating contains a butadiene resin, a portion of the resin used in the second layer, and curing agent for the resin. The process is particularly adapted to bonding polyvinyl chloride pipe cores to epoxy-impregnated glass fiber overwrap to form improved laminated plastic pipe.

Abstract: Milled talc materials containing about twenty to about thirty-five weight percent tremolite having particle size distributions such that no more than five percent of the particles are larger than 10 microns, no more than 12 percent of the particles are larger than five microns and no more than 15 percent of the particles are smaller than 0.3 microns in equivalent spherical diameter have improved opacifying properties for use in paper, rubber, plastics and paint manufacture. The materials can be obtained by jet or fluid energy milling and by controlling the milling variables to produce particle size distributions within the critical range.

Abstract: There are disclosed methods of splicing reinforcement across joints of pre-cast reinforced concrete sub-slabs for integrating such sub-slabs to define the underside layer of composite concrete continuously reinforced slabs formed without separate formwork other than shoring for the sub-slabs to define continuously reinforced spans and two-way flat plates, sub-slabs for use therein, joints formed thereby and building structures formed thereby.