摘要:
The invention relates to an anti-filming surface adjuvant for hydraulic binders comprising at least one fat and at least one anti-caking agent, to its preparation method as well as to a method for preparing a hydraulic binder composition suitable for making screeds or self-compacting concretes (SCC) including the step consisting of adding to the hydraulic binder the adjuvant according to the invention at a dosage comprised between 50 and 1,500 g/m3 of screed or of concrete.
摘要:
A heavy oil ash self-compacting concrete can include aggregate, heavy oil ash fines, water, and cement. The heavy oil ash can include more than 90% carbon, by weight. In an embodiment, the heavy oil ash self-compacting concrete can flow under its own weight and yet maintain a stable mixture consistency.
摘要:
This invention relates to compositions that have utility, amongst others, in the stabilization of suspension particles or gas bubbles in fluid water-based compositions and/or in conferring shear thinning behavior to such fluid water-based compositions. The inventors have developed parenchymal cellulose based materials, which comprise cell wall derived networks of cellulose based fibers and nanofibrils, can advantageously be used for stabilization of suspended solid particles in fluid water-based compositions. Specific aspects of the invention concern the parenchymal cellulose based materials, their production and their use in fluid water-based compositions, as well as the resulting fluid water-based compositions per se.
摘要:
The present disclosure describes a self-consolidating concrete (SCC) mixture having a compressive strength of at least 25 MPa at 28 days of age. In accordance with one embodiment, there is provided an SCC mixture, comprising: a mixture of coarse aggregate (CA), fine aggregate (FA), very fine aggregate (VFA), cementitious materials including Portland cement or Portland limestone cement, an ASTM C494 Type F polycarboxylate ether high range water reducer, and water, wherein the VFA has a particle size distribution in which 95% to 100% passes a 2.5 mm sieve and in which 20% to 100% passes a 75 μm sieve.
摘要:
Disclosed are a system, a method and/or composition of reduction of carbon dioxide in the manufacturing of cement and concrete. In one embodiment, a method of producing a concrete, includes preparing a dried powder mixture of an alkali hydroxide, a sodium silicate, clay and a pozzolanic material. The dried powder with water may be reacted to form a cement paste. In addition, the cement paste may be mixed with at one of sand, an aggregate, a plasticizer and a nano additive to form the concrete.
摘要:
A foamed concrete having a density from 100 to 800 kg/m3 including by mass relative to the total mass of the concrete: a cement; water; from 0.01 to 5% of a water-reducing agent, plasticizer or superplasticizer; from 0.45 to 5% of a foaming agent relative to the amount of water; from 0.01 to 5% of a water-soluble calcium salt; inorganic particles from 0.1 to 300 μm in size; the ratio of foaming agent to calcium salt being from 0.3 to 0.8; the foamed concrete including 10% or more by mass of slag.
摘要:
A self-leveling cementitious mixture with excellent flow properties and which hardens with a controlled rate of strength development to an ultra-high compressive strength composite composition for use in making articles such as cementitious armor panel with ballistic and blast resistant properties including: a continuous phase resulting from the curing of an aqueous mixture, in the absence of silica flour, of inorganic cement binder, inorganic mineral filler having a particle size of about 150-450 microns, pozzolanic mineral filler, polycarboxylate based self-leveling agent and water. The cementitious mixture may include alkanolamine, such as triethanolamine, and acid or acid salt, such as tartaric acid. The cementitious composition may be reinforced with reinforcing fibers, e.g. glass fibers, in an amount of about 0.5-6.0% by volume of the overall cementitious composition. The fibers are uniformly dispersed in the cementitious composition before it is cured to form a final cementitious armor panel.
摘要:
A cement composition for a self-levelling concrete, includes a mixture of rheology-modifying additives, the combination of at least a first agent for substantially increasing the shear threshold of the concrete in the fluid state, selected from a natural polysaccharide ether, a hydroxyalkyl guar ether, a hydroxyethylcellulose or a hydroxypropyl guar, which are hydrophobically modified with the introduction of hydrophobic side grafts, and at least a second viscosity-increasing agent for substantially increasing the viscosity of the concrete in the fluid state, selected from a non-hydrophobically-modified hydroxyalkylcellulose having a degree of polymerization between approximately 500 and approximately 4500 and a viscosity of less than 50 PA·s in aqueous solution at 2 wt.-% and a poly (ethylene oxide), in order to limit or prevent the dynamic segregation of granulates in the concrete during the implementation thereof. The use of such a composition can replace the presence of a filler in the concrete, in particular a self-levelling concrete, without diminishing the performance concerning the spreading thereof, the sieve stability, the bleeding and the dynamic segregation relative to a concrete containing a filler, in particular a concrete having the same water/cement ratio.
摘要:
The present invention relates to the use of a mixture that is dispersible, redispersible, or soluble in water, or an aqueous composition for protecting substrates from corrosion, wherein the mixture, or the composition, is based on at least one organic polymer that is soluble in water and at least one organosilicon compound. The invention further relates to a mixture that is dispersible, redispersible, or soluble in water, based on at least one organic polymer that is soluble in water and at least one organosilicon compound having at least one Si—O—Si bond and/or at least one Si—Si bond, wherein either the content of the organic polymer soluble in water, based on the sum of the organic polymer soluble in water and of the organosilicon compound, is between about 40 and about 80 wt.-%, or the organosilicon compound is an oligomer mixture of alkyl alkoxy siloxanes, wherein the oligomer mixture contains 50 to 100 wt.-% of alkyl alkoxy siloxanes, and the same have a degree of oligomerization of 2 to 20. The invention further provides a method for the production of mixtures according to the invention and the use thereof.
摘要:
The invention includes a method of making and using a flowable thermal backfill. The flowable thermal backfill has a low thermal resistivity, useful for filling trenches containing electrical cables and other lines that generate heat. The method includes process steps of blending ingredients of stone, sand and fly ash, making a flowable thermal fill by mixing the blended stone, sand and fly ash with Portland cement and water, and pouring the flowable thermal fill in an excavation containing heat generating lines, immediately after mixing the flowable thermal backfill.