33results about How to "High long-term strength" patented technology

The invention discloses a silica sol slow infiltration reinforcing method of argillaceous soft rock, which belongs to the silica sol slow infiltration reinforcing method of the argillaceous soft rock. The silica sol slow infiltration reinforcing method is realized by the following steps of a, evaluating lithological changes, pore development characteristics and hydrogeological conditions of roadway surrounding rock, and determining grouting hole parameters and silica sol mixture ratio; b, constructing grouting holes before argillization; mounting a grouting pipe and sealing the holes, and injecting silica sol; during operation, quickly filling and reinforcing macrofractures with the silica sol under the drive of grouting pressure; c, when the grouting pressure is reduced to a certain value, maintaining low pressure for a long time; during operation, enabling the silica sol to slowly diffuse and enter into microfissures of a rock mass under the drive of a capillary force to form a high-compactness reinforcing body, and finishing the reinforcing of the surrounding rock. According to the silica sol slow infiltration reinforcing method disclosed by the invention, the macrofractures are filled, water microchannels of molecules and air molecules in a mud rock matrix are closed, microcosmic effects such as adsorbing, dissolving and weathering are obviously hindered, the compactness and the integrity of a microstructure of mud rock are greatly improved, and further the permeability is reduced, and eventually the deformation resistance and the durability of the rock mass are improved.

The invention discloses a high-strength muck unfired product and a preparation method thereof. The high-strength muck unfired product is prepared from the components in parts by weight: 20-50 parts ofblast furnace slag, 50-90 parts of muck, and 8-30 parts of an alkali-activator. According to the high-strength muck unfired product, the surface of the muck is coated with the blast furnace slag, calcium ions are released in an alkaline solution, the calcium ions substitute low-valence positive ions adsorbed on the surface of clay particles in the muck, the thicknesses of double electric layers on the surfaces of the clay particles are decreased, the distance between the particles become small, compaction is conducted under the action of the external pressure, and a more compact structure isobtained; active components in the blast furnace slag reacts with the alkali-activator to generate gelling substances such as C-A-S-H, the gelling substances are connected with muck particles, the early strength is formed, and sun cracking caused by water losing of the muck can be resisted; and under the high-alkaline condition, silicon oxide and aluminum oxide in the muck are released slowly to react with the alkali-activator in a pore solution, a geopolymer is generated, on the one hand, pores are filled, on the other hand, the muck particles are cemented better, and thus the long-term strength of the product is improved.

The invention discloses aluminate cement and a preparation method thereof, and relates to the field of building materials. The aluminate cement comprises the following components in percentage by mass: (1) 55.0%-75.0% of aluminate cement clinker, (2) 3.0%-10.0% of barium slag, (3) 5.0%-15.0% of garnierite tailings, (4) 5.0%-15.0% of red mud, (5) 3.0%-10.0% of steel slag, and (6) 2.5%-5.0% of gypsum, wherein the content of aluminium oxide in the aluminate cement clinker is 47.0%-65.0%. The preparation method of the aluminate cement comprises the following steps: (1) preparing materials, (2) grinding, and (3) pulverizing. The aluminate cement has the characteristics of being high in hardening rate and high in hardening strength, and besides, effectively overcomes the defect that the long-term strength of the conventional aluminate cement is relatively low, and effectively uses various industrial wastes, and is a very ideal cement material.

The invention provides an inorganic cementing material and a preparation method thereof. The cementing material is obtained by jointly grinding grog obtained by steam curing and calcinating material blocks or material balls prepared from coal ash, lime, an exciting agent and water and gypsum. The preparation method includes the steps that by mass, 65-80 parts of coal ash, 20-35 parts of effective CaO of lime and 0.5-2.0 parts of the exciting agent are jointly ground into a batch mixture with the degree of fineness being 45 microns and the residue on sieve being smaller than 10%, 15-50 parts of water is added, the mixture is mixed to be uniform, then aging is conducted for 2-3 hours, the material blocks or the material balls are subjected to steam curing for 8-16 hours at the temperature of 90-98 DEG C after being formed, then calcinated for 15-120 minutes at the temperature of 750-1,000 DEG C and then air cooled or cooled in air, and the grog is obtained; 90-95 parts of the grog and 5-10 parts of gypsum are jointly ground till the specific area is 350-500 m<2>/kg, and the inorganic cementing material is prepared. Low-quality coal ash which is high in carbon content can be used as the main material of the inorganic cementing material, calcinating temperature and heat consumption are low, and a product has the advantages of being high in setting speed and hardening speed, high in long-term strength and good in water resistance and sulfate resistance.

The invention relates to the technical field of building materials, in particular to a high-strength polyvinyl alcohol fiber reinforced cement-based composite material and a preparation method and application thereof. The high-strength polyvinyl alcohol fiber reinforced cement-based composite material is prepared from the following raw materials in parts by weight: 100-130 parts of superfine Portland cement, 325-350 parts of an active mineral admixture, 215-230 parts of an inorganic admixture, 1-2 parts of a defoaming agent, 2-2.3 parts of a water reducing agent, 45-60 parts of water and 3-5 parts of polyvinyl alcohol fiber. According to the invention, a PVA-ECC material is applied to the ultra-high performance concrete to prepare the composite material, and the composite material is applied to preparation of an anti-seismic structure, a large-deformation structure and a composite structure.

The invention relates to a high-performance gypsum water reducing agent, which is prepared from the following raw materials in parts by weight: 300 to 350 parts of polyoxyethylene ether, 20 to 30 parts of crylic acid, 10 to 20 parts of styrene, 5 to 10 parts of vinylphosphate, 1 to 5 parts of 2-acrylamide-2-methylpropanesulfonic acid, 580 to 650 parts of water, 1 to 5 parts of initiator and 1 to 3parts of molecular weight regulator; and the high-performance gypsum water reducing agent is further prepared from 10 to 30 parts of emulsion and 10 to 20 parts of nano-calcium carbonate. The water reducing agent can effectively decrease the later water absorption of gypsum and increase long-term performance.

The invention relates to a gypsum water-reducing agent which is prepared from the following raw materials in parts by weight: 300 to 350 parts of polyoxyethylene ether, 20 to 30 parts of acrylic acid,10 to 20 parts of styrene, 5 to 10 parts of ethylenephosphonic acid, 1 to 5 parts of 2-acrylamide-2-methyl propane sulfonic acid, 580 to 650 parts of water, 1 to 5 parts of initiator, 1 to 3 parts ofmolecular weight modifier, and 10 to 30 parts of emulsion. According to the water-reducing agent, the water absorption rate of gypsum at the later period can be effectively reduced, and the long-timeperformance is improved.

Provided is an additive for concrete in which viscosity of a cement composition is low and fluidity is high at an initial stage of casting even when the additive is added, and long-term strength of concrete or the like improves by the addition. A cement additive comprising a water-absorbent resin, wherein the water-absorbent resin is formed by polymerizing a monomer mixture containing no less than 50 mol % of a nonionic non-crosslinkable monomer and no less than 0.1 mol % of a nonionic crosslinkable monomer, and a content of an anionic monomer in the monomer mixture is no more than 20 mol %.