摘要:
Fibre reinforced composites of cementitious materials or gypsum are reinforced with pre-combined mixtures of strong reinforcing fibres e.g., glass or steel, and water absorbent fibres, e.g., cotton. Examples of composites are cement pipes, wall boards, etc.
摘要:
An inorganic coating slurry composition with reduced water permeability is formed with 5 - 700 parts by weight of an inorganic filler, 0.1 - 30 parts by weight of a water swellable magnesium silicate or bentonite, 0.1 - 50 parts by weight of a water soluble water repellent, 0.01 - 10 parts by weight of an organic viscosity improver and 100 parts by weight of a silica sol containing a silica content of from 3 - 50 wt percent and at least one alkali component wherein the mole ratio of SiO2 to M2O is greater than 4 and wherein M2O represents an alkali metal oxide, ammonium hemihydrate, an amine hemihydrate, a quaternary amine hemihydrate, guanidine hemihydrate or hadrazine hemihydrate.
摘要:
A process is described for the production of fiber-containing plastic-formed plaster of Paris products which have superior hardness, surface smoothness and flexural strength as well as good extrusion characteristics and physical integrity. In the process of this invention a composition comprising specified concentrations of plaster of Paris, natural or synthetic fiber, latex, hydromodifier and water is formed into a plastic tractable mixture which may be extruded, molded, or otherwise plasticformed under pressure and then set to produce the desired shaped product. Additional materials such as auxiliary cementing agents, fillers and the like may also be present.
摘要:
A RAW BATCH CONTAINING FIME BUBBLES HOMOGENEOUSLY DISPERSED THEREIN, SAID BATCH BEING SUITABLE USED FOR THE FORMATION OF POROUS ARCHITECTURAL STRUCTURES, SAID BATCH COMPRISING A HOMOGENEOUS MIXTURE OF 100 PARTS BY WEIGHT OF A HYDRAULIC SUBSTANCE, 0.0001-0.1 PART BY WEIGHT OF A BLOWING AGENT, 0.001-1.0 PART BY WEIGHT OF A FOAM STABILIZER AND 70-200 PARTS OF WATER, AND A METHOD FOR PRODUCTION THEREOF.
摘要:
THIS INVENTION RELATES TO BONDING OF ROCK AGGREGATES BY MEANS OF AN ELASTOMER BONDING AGENT AND RELATES PARTICULARLY TO RAILROAD BED CONSTRUCTION IN WICH THEBALLAST IS BONDED BY MEANS OF AN ELASTOMER BOND BETWEEN THE INDIVIDUAL ROCK PARTICLES OF THE AGGREGATE, AND TO METHODS OR CONSTRUCTION, AND TO COMPOSITIONS OF MATTER USEFUL FOR PRODUCING SAID ELASTOMERIC BOND.
摘要:
A RAPID PROCESS FOR FORMING A REFRACTORY LAMINATE ON THE SURFACE OF A SUPPORT STRUCTURE WHICH COMPRISES DIPPING THE STRUCTURE INTO A BATH COMPRISING A SOL OF POSITIVELY CHARGED COLLOIDAL PARTICLES OF AN INORGANIC SUBSTANCE TO FORM A COATING ON THE SURFACE, CONTACTING THE COATED SURFACE WITH A POLYMER LATEX CONTAINING AN ANIONIC SURFACTANT TO FIRMLY SET THE COATING, AND REMOVING EXCESS POLYMER LATEX FROM THE COATED SURFACE. THIS PROCEDURE IS REPEATED UNTIL A LAMINATE OF THE DESIRED THICKNESS IS BUILT UP ON THE SURFACE. THIS TECHNIQUE MAKES IT POSSIBLE TO SUCCESSIVELY APPLY AND SET COATINGS IN VERY SHORT TIMES WITHOUT INTERMEDIATE DRYING AND WITHOUT SLOUGHING OF COATS. THE PROCESS IS PARTICULARLY SUITED FOR MAKING EXPENDABLE REFRACTORY SHELL MOLDS FOR PRECISION INVESTMENT CASTING OF METALS BY THE SO-CALLED "LOST-WAX" TECHNIQUE.