Abstract: A concrete material that includes an elastomeric polymer in an amount sufficient to provide flexibility to the resultant material; a silicone resin in an amount sufficient to improve adhesion between the elastomeric polymer and the cement; a cement that has low shrinkage and expansion properties; a filler; and water in an amount sufficient to cure the cement and form the concrete material. The polymer is present in an amount which fills at least some of the pores in the material and the silicone resin helps the polymer bond the filler to the cement. Also, a concrete material property improving additive in the form of a polymer admixture that includes the elastomeric polymer, a silicone resin and at least one solvent in an amount sufficient to form a viscous flowable mass. Another embodiment is a method of forming a concrete material by forming and curing a mixture of the additive, a cement that has low shrinkage and expansion properties, a filler, and water in an amount sufficient to cure the cement.

Abstract: A method for producing cast-in-place flexible joined-together constructional structures and buildings comprises applying to precleaned mating surfaces of the constructional structures and buildings involved a thiokol-containing compound incorporating the following components, wt %.______________________________________ liquid thiokol 80-120 inorganic pigment 20-45 vulcanizer of aerobic rubber hardening 6.5-10.0 adhesive additive 5.5-7.5 rubber hardener 0.05-0.15 cross-linking agent 2.6-4.1 modifier 0.3-0.4 coal tar 14.5-31.2, ______________________________________followed by filling a space confined between the mating surfaces with a mortar based on a cement having a maximum expansion ratio of 0.3%. Then the joined-together constructional structures or buildings are held for a period of time long enough for vulcanization of the thiokol-containing compound and cement hardening so as to impart elastomonolithic properties to the joined-together constructional structures or buildings involved.