Incorporation of rubber tire crumbs and siliceous crystalline grains in construction products

A product in the form of a configured slab, said product consisting essentially of:

• (a) rubber crumbs composed of tire tread rubber, said rubber crumbs being characterized by fibrillar surfaces with asperities;
• (b) siliceous crystalline granules, said siliceous crystals having planar facets at irregular angles;
• (c) said rubber crumbs and said crystalline granules on average being no more than an order of magnitude different in size;
• (d) a binder in the form of a polymerizate having as its essential ingredient a member of the class consisting of a polymerized rubber and a polymerized epoxy;
• (e) said binder intimately contacting said fibrillar surfaces and said asperities of the surfaces of said rubber crumbs and said crystalline granules;
• (f) said rubber crumbs and said crystalline granules forming an internal phase that is closely packed;
• (g) said binder forming an external phase;
• (h) said tire tread rubber, by weight thereof, consisting essentially of from 8 to 25% of an organic solvent residue, from 5 to 10% of an inorganic residue, form 25 to 45% of an inorganic filler, from a trace to 2% moisture, and from 35 to 50% of vulcanized rubber hydrocarbon;
• (i) said rubber crumbs and said siliceous granules generally having a mesh size ranging from 5 to 50;
• (j) said slab ranging from 3/16 to 5/8 inch in thickness.
• (k) in parts by total weight, said rubber crumbs ranging from 20 to 40, said silica granules ranging from 5 to 15, and said binder ranging from 10 to 30.