Matches 451 - 500 out of 538 < 1 2 3 4 5 6 7 8 9 10 11 >
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5085701 Polymer-modified bitumen (PMB)  
A polymer-modified bitumen (PmB) having improved elastic restoration prepared by blending from 0.5-20 wt. % of a polymer material in bitumen, said polymer additive, which may be comprised of...
5062897 Carbon fiber-reinforced hydraulic composite material  
A carbon fiber-reinforced hydraulic composite material having excellent mechanical strength, workability, and freezing-and-thawing resistance, wherein chopped carbon fibers having a monofilament...
5028271 Vinyl grafted lignite fluid loss additives  
A vinyl grafted lignite fluid loss additive comprising a lignite grafted with at least one vinyl monomer selected from the group consisting of: dimethylaminopropyl methacrylamide, methacrylamido...
5004506 Welan gum in cement compositions  
Cement compositions, i.e., mortar, structured concrete, pre-cast concrete, and oilfield cement, comprising 0.01-0.9% (wt/wt) welan gum are described.
4992104 Method for preparing mortars and concretes using polyfluorinated surface-active compounds as water-reducing plasticizers  
The invention relates to the preparation of mortars and concretes in the presence of a water-reducing plasticizer. The plasticizer used is a surface-active compound containing at least one...
4977227 Lignosulfonic graft copolymer as a cement dispersant  
This invention provides a cement dispersant of a lignosulfonic acid graft copolymer, obtained by a redox free radical reaction of lignosulfonic acid or its salts with one or more acrylic or vinylic...
4975122 Water resistant cemetitious materials  
An improved water-resistant cementitious composition and products made therefrom are provided by forming an aqueous cementitious slurry, as for example of calcined gypsum and adding an organic...
4963190 Dispersant composition for cement  
An aqueous dispersant composition for cement comprises 100 parts by weight of a copolymer of an olefin having 2 to 8 carbon atoms and an ethylenically unsaturated dicarboxylic anhydride, the...
4961789 Procedures for the preparation and fabrication of concrete additives produced from natural products  
A process is disclosed for manufacturing water reducing plasticizing and hardening-retarding plasticizing additives for concrete, using sugarcane derivatives that modify the structural...
4961790 Concrete admixture device and method of using same  
A device comprising a solid or powdered concrete admixture contained in a water-soluble container such that when the container and its contents are introduced into a wet mixer and agitated for a...
4946904 Additives for cement  
An additive for cement comprising, as the effective component, a copolymer of a polyoxyalkylene derivative represented by following formula (1) and maleic anhydride, a hydrolyzed product of the...
4915741 Cementitious mixes  
The fluidizing or water-retention effect of plasticizers and superplasticizers in cement is increased when the cement has been treated with water before the mixing step, so that it retains from 0.1...
4897120 Accelerator for portland cement derived from fertilizer  
Method of producing a calcium nitrate composition, and the resulting composition, for use as a accelerator for time of set for portland cement in concrete and mortars comprising the steps of...
4888058 Silica fume slurry  
A stable, aqueous dispersion of silica fume is formed using a 70-80% ferrosilicon production fume by-product by the inclusion of very small amounts of a stabilizing agent selected from a phosphoric...
4888059 Cement dispersing agent  
A cement dispersing agent comprising as an essential component a copolymer obtained by copolymerizing (a) 40 to 90% by weight, calculated as an alpha,beta-ethylenically unsaturated carboxylic acid,...
4861378 Cement additive containing superplasticizer and bentonite  
A cement additive contains a superplasticizer, an inorganic strength increasing agent such as calcium sulfate or silica fume and bentonite.
4792360 Workable cement composition of low water content containing a hydroxyalkyl (meth)acrylate polymer  
Cement compositions having better and longer lasting workability have been made by adding to said compositions a polymer or copolymer of a hydroxyalkyl(meth)acrylate, e.g. hydroxyethyl acrylate or...
4786331 Cement dispersion agent  
A cement dispersion agent comprising calcium polystyrene sulfonate having a weight average molecular weight of 5,000 to 50,000 and having a sulfonation degree of 80% or more. Further, a cement...
H000493 Alkylsulfonated polysaccharides and mortar and concrete mixes containing them  
Alkylsulfonated polysaccharides, methods of making them and use of said polysaccharides for improving the flowability of mortar and concrete mixes are disclosed.
4747877 Chloride-free hardening accelerant for portland cement and process thereof  
This invention relates to a chloride-free hardening accelerant for Portland cement which is active in particular at low temperatures and contains calcium nitrate, sodium nitrate,...
4746367 Superplasticizer composition for use with hydraulic cements  
An improved superplasticizer comprising the combination of a sulfonated copolymer of styrene and alpha-methylstyrene together with a minor amount of a salt of gluconic acid.
4707187 Mortar admixture  
A mortar composition comprises a mortar and a carboxymethyl hydroxyethyl cellulose (CMHEC) having a degree of substitution (DS), by carboxymethyl group per a glucose unit, of 0.7 or less and a...
4683003 Process for production of cellular concrete  
A process for producing cellular concrete articles in the so-called pre-foam fashion, comprises molding a mixture (D) of a cement compound slurry (A) comprising calcium silicate and a...
4681634 Composition cimentaire hydraulique a prise retardee pour cimentation a hautes temperature et pression  
Hydraulic cement composition with delayed setting, intended to be employed in an environment which may be under extreme temperature, pressure and salinity conditions, the composition being...
4676832 Set delayed cement compositions and methods of using the same  
Set delayed cement compositions capable of being retained in pumpable fluid states for long time periods and then activated to set into hard masses and methods of using such compositions for...
4654084 Method for controlling contraction in setting cementitious systems  
The contractions of aqueous hydraulic cement mixtures in the plastic state is controlled by the addition of a gas generating agent capable of generating gas in the mixture without the addition of...
4568471 Fluid loss additive for cement  
An aqueous solution of a terpolymer, useful as fluid loss agent for drilling muds and not for cement slurries, is treated with acid and heat. An excellent fluid loss agent for cement is obtained....
4507154 Chloride-free setting accelerator for hydraulic binding agents  
For the acceleration of the setting and of the hardening of a hydraulic binding agent such as cement, limestone, hydraulic limestone and gypsum as well as mortar and concrete prepared thereof, are...
4488907 Process for the preparation of lignosulfonate-based mixtures used in particular as additives of concrete  
The present publication describes a process for the preparation of lignosulfonate-based mixtures used in particular as additives of concrete. According to the process of the present invention, the...
4441929 Superplasticizers for cementitious compositions  
Superplasticizers for cementitious compositions are produced from a raw material mixture of (1) naphthalenesulfonic acid formaldehyde condensate and (2) free sulfuric acid using a 1-step process or...
4424074 Additives for cementitious compositions  
Additives for cementitious compositions which are mixtures of (1) salts such as the sodium salt of a condensation product of naphthalenesulfonic acid and formaldehyde and (2) zinc salts increase...
4406702 Additive compositions for hydraulic cement base mixtures  
Additive compositions, made up essentially of a mixture of a salt of a very high molecular weight condensation product of naphthalenesulfonic acid with formaldehyde, containing not less than 35% by...
4391645 Additives for cementitious materials  
Superplasticizers with improved water reducing properties for cement, cement slurries, mortar, grout and concrete are formed from synergistic mixtures of (1) aromatic sulfonic acid formaldehyde...
4351671 Water reducing agent with reduced air  
Additive, e.g., ethoxylated nonylphenol, for lignin type water-reducing agent in hydraulic cement compositions, reduces air entrainment in the concrete mix.
4345944 Cement additive  
An additive for cement comprising a granular molded product formed of a water-reducing agent composed mainly of a naphthalenesulfonic acid/formaldehyde high condensate (NSF) or salt thereof, and a...
4332619 Expansive admixture  
An expansive admixture is shown of the type used in cementing oil and gas well bores. Aluminum particles are coated with a gasoline and water insoluble wood resin. The resin coated aluminum...
4298394 Organic gypsum set accelerators  
A gypsum set accelerator for use in the production of gypsum wallboard comprises a tube or ball milled mixture of gypsum and up to 20 percent by weight of the gypsum of a synthetic water-soluble...
4290817 Glucoheptonate composition  
Byproduct ammonium ions remaining in an aqueous solution of a water soluble glucoheptonate salt after its synthesis are reacted with the free acid form of a naphthalenesulfonic acid-formaldehyde...
4284433 Additives for water-hardening binding agents  
Water-hardening binding agent such as concrete, mortar, cement and the like are modified with a solid additive in the form of aggregates consisting of fine particle having a grain size of from 0.1...
4283229 Process for the preparation and use of stable cellulose ether suspensions  
This invention relates to an improvement in the process for the preparation of a stable aqueous electrolyte-containing cellulose ether suspension, wherein an inherently water-soluble cellulose...
4265674 Additive for concrete or mortar and the use thereof  
This invention relates to an additive for concrete and mortar comprising a cellulose ether and a non-ionic, low-foaming surface-active agent.
4239550 Flowing agent for concrete and mortar and process for producing the same  
Flowing agent for concrete and mortar based, on the one hand, on lignin sulfonate and, on the other hand, on ring-sulfonated or sulfomethylated aromatic substances, wherein the mixture of the basic...
4237260 Plaster consistency reducer  
An additive for reducing the amount of water necessary in forming a pourable aqueous calcined gypsum slurry, the additive comprising a high potassium salt of a condensation product of naphthalene...
4230502 Building material additive  
A building material additive comprising an aqueous dispersion of a hydrophobic constituent which is completely wetted with a surfactant, and a water-soluble polymer is disclosed. The dispersion may...
4225358 Additive for dehumidifying plaster  
A plaster additive, especially for use with cement-based dehumidifying plasters which impart to the plaster the property of low resistance to the diffusion of water therethrough, permitting the...
4211572 Dry-set mortars and method for improving the water retentivity thereof  
The water retentive properties of dry-set mortars containing water retentive agents such as cellulose ethers can be improved by the addition of small amounts of a promoter material such as ethylene...
4205993 Concrete water-reducing admixture  
A water-reducing admixture for use in hydraulic cement compositions comprising about 25 parts by weight of a lignosulfonic acid salt, from about 6 to 16 parts of calcium formate; and from about 2...
4204876 Cement coloring composition and method of producing same  
Thixotropic compositions for coloring cement or concrete or similar products comprise particulate pigment particles (about 20-80% by weight), at least one stabilizer (about 0.4-15%), a dispersent...
4188231 Methods of preparing iron oxide mortars or cements with admixtures and the resulting products  
A mortar or cement composition is provided which is adapted for being mixed with water and thereafter set. The composition comprises cement mixed with iron oxide in a ratio of about 1:4. At least...
4149900 Oil well cementing composition  
Oil well cementing compositions and processes are produced using a high efficiency sulfoalkylated lignin retarder composition and modifications thereof to produce cement compositions without...
Matches 451 - 500 out of 538 < 1 2 3 4 5 6 7 8 9 10 11 >