38 results about "Strength function" patented technology

The invention relates to a cement concrete early strength agent. The cement concrete early strength agent contains nano calcium carbonate and light calcium powder. Preferably, the cement concrete early strength agent further contains calcium formate and one or more kinds of calcium nitrate. The cement concrete early strength agent comprises, by mass, 20-67 parts of nano calcium carbonate, 33-80 parts of light calcium powder, 0-10 parts of calcium formate and 0-10 parts of calcium nitrate. Compared with an existing early strength agent, the cement concrete early strength agent has the most outstanding advantages that no harmful ions are introduced, the use environment is prevented from being polluted, and the cement concrete early strength agent is nontoxic and harmless; in addition, cement concrete early strength can be improved, and the primary solidification time and final solidification time of cement concrete are shortened. The invention further relates to an early strength and water reduction agent containing the cement concrete early strength agent. The early strength and water reduction agent comprises, by mass, 60%-75% of early strength components and 25%-40% of water reducing components. The early strength and water reduction agent has a good early strength function, a good water reduction function and a good strengthening function, the water reduction rate is high, the early strength of concrete can be remarkably improved, and later strength is not affected.

The invention relates to a concrete early strength agent and a preparation method thereof and aims to provide a concrete early strength agent which has water-reducing and early strength functions and can rapidly raise early strength of concrete after being doped and a preparation method thereof. The concrete early strength agent is obtained by free radical polymerization of VPEG, any one ingredient selected from a group consisting of methacrylic acid, acrylic acid and maleic anhydride, acrylamide or maleimide, and octadecyl methacrylate. The prepared concrete early strength agent has high water-reducing rate and excellent early strength performance. When solid volume discount is 0.2%, the water-reducing rate can reach 30% and above, 1d compressive strength rate of concrete reaches 240% and above, and 3d compressive strength rate reaches 220% and above. During production of a prefabricated part in winter, steam curing time can be shortened. During production in summer, the steam-curing process can be avoided. Thus, energy consumption is greatly reduced, and production cost of the prefabricated part is lowered.

The invention discloses an early strength type polycarboxylic acid water reducer and a preparation method thereof. The early strength type polycarboxylic acid water reducer is prepared through steps of synthesizing a macromonomer by utilizing polyether with an early strength function, introducing a polymerized small monomer with the early strength function in a synthesis process and adopting a double-dropping manner according to a free radical polymerization principle under the action of an oxidization-reduction initiation system. The early strength type polycarboxylic acid water reducer provided by the invention has good dispersion performance and has the effect of remarkably improving the early strength; the early strength type polycarboxylic acid water reducer is remarkably better thana common polycarboxylic acid water reducer and a common naphthalene series water reducer for pipe piles.

The invention provides an early strength type polycarboxylic acid high performance water reducing agent. A dendritic macromolecule copolymerized monomer taking methacrylic acid terminated hexanediamine as a core is introduced, and early strength properties of hyperbranched and amide groups of a dendritic macromolecule are utilized; then an isocrotyl polyoxyethylene ether macromonomer with high molecular weight is introduced and the long-side-chain steric hindrance and early strength functions are utilized; finally, the early strength effect is further enhanced by utilizing an unsaturated acylamino small molecule. The early strength type polycarboxylic acid high performance water reducing agent provided by the invention is the early strength type polycarboxylic acid high performance water reducing agent with obvious early strength effect and excellent comprehensive performance. Meanwhile, the invention provides a preparation method of the early strength type polycarboxylic acid high performance water reducing agent; the method comprises the steps of firstly preparing the dendritic macromolecule copolymerized monomer taking the methacrylic acid terminated hexanediamine as the core and then preparing the early strength type polycarboxylic acid high performance water reducing agent; the preparation method has the advantage of simple steps.

The invention provides an allyl sulfonic glycerin polyoxyethylene polyoxypropylene ether polycarboxylic acid water reducer and its synthesis method. Belonging to the field of concrete admixtures, the water reducer is a polymer of allyl sulfonic glycerin polyoxyethylene ether or allyl sulfonic glycerin polyoxypropylene ether (unit A) and unsaturated carboxylic acid and its derivative (unit B). According to the synthesis method provided in the invention, 500-6000 structural unit A is adopted as a polymerization monomer to undergo random free radical copolymerization in an aqueous system. Due to the introduction of a long chain of allyl sulfonic glycerin into a side chain, the water reducer has an early strength function, thus changing the mode of achieving an early strength effect only through compounding an early strength agent. Additionally, the water reducer provided in the invention has a simple synthesis process, good compatibility and good adaptability, and facilitates substantial improvement of the production efficiency and production benefits.

The invention provides a slotting parameter extraction method for oil pipe electronic tag implantation. The slotting parameter extraction method comprises the following steps that the length A, the width B and the height G of an electronic tag are obtained; ANSYS simulation analysis is carried out to obtain the width W2 of the allowable slotting of the stress state of the tubing coupling, the depth H2 of the allowable slotting and the length L2 of the allowable slotting; The value ranges of the length L, the width W and the depth H of the electronic tag mounting groove are obtained; with the value range of the width W and the depth H of the electronic tag mounting groove fitting a functional relationship between the coupling stress and the stress function to obtain the yield strength of the material for the tubing coupling and the length L of the slot; fitting a function relationship between the radio frequency signal strength and the radio frequency signal strength function to obtaina second association relationship between the signal source strength required for receiving the radio frequency signal within a certain range and the length L, width W and depth H of the slot; And solving the first association relationship and the second association relationship to obtain accurate values of the length L, the width W and the depth H of the slot.

The invention discloses an early-strength-type polycarboxylic acid high-performance water reducer. The early-strength-type polycarboxylic acid high-performance water reducer is capable of, through introducing a dendritic macromolecule comonomer using methacrylic acid end-capped butanediamine as a nucleus, using an early strength feature of a hyperbranched and amide group of a dendritic macromolecule, and through introducing an isoprenyl polyoxyethylene ether macromonomer of a large molecular weight, using a long side chain steric hindrance and an early strength function thereof, finally further reinforcing the early strength effect by using an unsaturated sodium sulfonate micromolecule. The early-strength-type polycarboxylic acid high-performance water reducer is remarkable in early strength effect, and excellent in comprehensive performance. The invention further discloses a preparation method for the early-strength-type polycarboxylic acid high-performance water reducer. The preparation method is capable of firstly preparing the dendritic macromolecule comonomer using the methacrylic acid end-capped butanediamine as the nucleus, and preparing the early-strength-type polycarboxylic acid high-performance water reducer. The preparation method has the advantage of simple process.

The invention provides a manufacturing and mounting method of a steel-plastic composite pipeline for gathering and transportation in an oil field. According to the method, steel-plastic composite pipes are prepared firstly, and then plastic pipes of the steel-plastic composite pipes are connected with steel pipes after subjected to fusion welding connection during mounting of the pipeline, so that the whole pipeline does not have seams or weak parts; the lining plastic pipes are firmly combined with the steel pipes, the strength function, the corrosion-resistant function and the non-leakage sealing function of the steel-plastic composite pipes can be fully performed during gathering and transporting of fluids, the high-temperature, high-pressure and high-corrosion fluids can be conveyed for a long distance safely and reliably, maintenance of the steel-plastic composite pipeline for gathering and transportation can be reduced, the gathering and transportation efficiency is improved, and the service life of the pipeline is remarkably prolonged.

The invention relates to an admixture for concrete and a preparation method thereof. A limestone powder mineral admixture special for the concrete is characterized in that the admixture is prepared by mixing and grinding limestone powder, citric acid, oxalic acid and quartz powder; the admixture comprises the following raw materials in portion by weight: 10,000 portions of the limestone powder, 3to 10 portions of the citric acid, 40 to 60 portions of the oxalic acid and 400 to 600 portions of the quartz powder; and the content of calcium carbonate in the limestone powder is not lower than 85 percent, and the specific surface area is between 500 and 700 m<2> / kg. The admixture has better early strength function, has small influence on later strength, has good retarding effect, greatly improves the performance of the concrete, and can obtain better economic benefit.

The present invention proposes a method for obtaining accurate rainfall data based on equivalent rain intensity, which is characterized in that, based on the tipping bucket rain sensor, it includes the following steps: Step S1: under the conditions of the test environment, different constant rain intensity values ​​are set , to test the tipping bucket rain sensor, and construct an equivalent rain intensity function according to the test results. Step S2: Obtain the instant rainfall function according to the equivalent rain intensity function. The present invention overturns the existing method of obtaining rainfall data through the tipping bucket rain sensor, and achieves the effect of breaking the routine with higher precision and smaller error, without modifying the main components of the conventional tipping bucket rain sensor In the case of changes, the collection of the time interval between two flips of the tipping bucket is introduced, combined with the characteristic attributes of the tipping bucket rain sensor, a new solution for obtaining accurate rainfall is constructed.

The invention discloses a passive radar fixed target frequency domain direction-finding method based on an external radiation source. The passive radar fixed target frequency domain direction-finding method comprises the steps of establishing a direction-finding system model; deducing a slant range progress of a single-scattering-point target; deducing a demodulated single-scattering-point target echo signal model and performing variable substitution for obtaining a frequency domain expression; expanding the frequency domain expression of the single-scattering-point target echo signal to a multi-target condition, modifying a target scattering strength function, and obtaining a relationship between the frequency domain expression of a multi-target echo signal and the modified target strength function; and calculating the direction of each target by means of a polar coordinate algorithm. The passive radar fixed target frequency domain direction-finding method is realized based on a narrow-band external radiation source signal in a two-dimensional space; the polar coordinate algorithm is used; and convolution operation is performed. The convolution operation can be processed through fast Fourier transform and inverse transformation, thereby greatly reducing calculation amount of the algorithm, realizing high robustness, obtaining relatively high direction finding precision and simultaneously finding a plurality of target directions in an observing area.

The invention provides a mounting method of a steel-plastic composite pipeline for gathering and transportation in an oil field. Segmental plastic pipes in fusion welding connection are subjected to diameter shrinkage processing and then are nested and connected with steel pipes. According to the mounting method, the whole pipeline does not have seams or weak parts, the lining plastic pipelines are firmly combined with the steel pipes, the strength function, the corrosion-resistant function and the non-leakage sealing function of steel-plastic composite pipes can be fully performed during gathering and transporting of fluids, the high-temperature, high-pressure and high-corrosion fluids can be conveyed for a long distance safely and reliably, maintenance of the steel-plastic composite pipeline for gathering and transportation can be reduced, the gathering and transportation efficiency is improved, and the service life of the pipeline is remarkably prolonged.

The invention discloses application of a mud-resistant slump-retaining type water reducer to a machine-made sand concrete prefabricated component and discloses the machine-made sand concrete prefabricated component comprising the mud-resistant slump-retaining type water reducer. The mud-resistant slump-retaining type water reducer developed by the invention is of a clustered molecular structure and contains a large number of amine cations with early-strength functions, thereby having multiple functions of mud resistance, slump retaining, early strength and the like and the mud-resistant slump-retaining type water reducer is applied to the machine-made sand concrete prefabricated component, thereby being capable of effectively improving the early-stage strength of the concrete while retaining slump of the concrete, avoiding steam curing and curing under natural conditions to achieve the mould stripping strength within 9 to 12 hours, and not adding any mineral reinforced materials and glass fibers to greatly reduce the production cost and the mould turnover cycle. Furthermore, the mud-resistant slump-retaining type water reducer in the machine-made sand concrete prefabricated component is a key technology node for achieving prefabricated assembly construction, fills up the domestic blank and has greater economic and social significance.