554 results about "High strength concrete" patented technology

The invention belongs to the architecture field, which relates to an improvement with the foundation pile shape and the structure and the manufacturing method of the foundation pile and the foundation pile shaper in the architecture field, in particular the invention is a prestressing force high strength concrete square pile and the manufacturing method thereof and the shaping device. In the invention a square terminal plate is disposed on the two ends of the square pile, and the four sides of the terminal plate is provided with a groove, while the center is equipped with a circular hole, and between the circular hole and the four sides, a strain hole and a threading hole are arranged symmetrically; a stirrp of a reinforcement cage in a twist is welded on the principal reinforcement continuously, wherein the principal reinforcement is the steel strand or the steel bar; the concrete square pile and the four-side corners of the terminal plate are in a stress elimination arc, and the pile core is a columnar mid level outlet having the same diameter with the terminal plate central circular hole. The manufacturing method is characterized in that, the principal reinforcement has the fix ed length and blanking, and the stirrp of the reinforcement cage is welded in the seam welder with the high degree of mechanisation; the principal reinforcement is stretched in a group of a whole pile fixed value, wherein the stretching performance is good and the balance is consistent; the disposable high pressure has short shaping time, low energy consumption, high product grade; the die design meets with the shaping requirement of the shape, which is convenient to use.

The invention discloses light high-strength concrete, which is prepared from the following raw materials in percentage by weight: 10 to 15 percent of silicate cement, 8 to 12 percent of mineral powder, 6 to 10 percent of coal ash, 2 to 6 percent of wollastonite, 20 to 30 percent of ceramsite,25 to 35 percent of ceramic sand, 0.2 to 0.8 percent of high-performance water reducing agent, 0.05 to 0.3 percent of exciting agent, 0.05 to 0.8 percent of tackifier and 8 to 12 percent of water. The light high-strength concrete has the advantages that compact accumulation is realized by optimizing the grain composition of cementing materials; the mineral powder is subjected to ultrafine grinding, so that the hydrated activity of the mineral powder is improved substantially; and the using quantity of the low-density cementing materials can be increased, and the cohesiveness of slurry is improved by combining the high-performance water reducing agent, the exciting agent and the tackifier, so that the concrete slurry is high in working performance and is not segregable, and the aim of reducing the volume weight of the hardened slurry substantially is fulfilled on the basis of ensuring the mechanical property of the hardened slurry.

The production process of permeable high-strength concrete paver includes the steps of: the first making base layer via mixing cement 18-21 wt%, small rubble of 3-5 mm size 50-55 wt%, large rubble of 7-10 mm size 18-21 wt%, admixture 0.1-6 wt% and water in 0.2-0.23 weight of cement, molding and vibrating to form; and the subsequent making facing layer via mixing cement 15-22 wt%, quartzite 76-85 wt%, admixture 0.1-6 wt%, dispersible latex powder 0.2-0.6 wt% and water in 0.24-0.26 weight of cement, pouring the mixture onto freshly formed base layer, and vibrating to form; demolding; and curing to obtain the finished product. The permeable high-strength concrete paver has high strength, high water permeability and no need of baking, and may be used widely.

The invention provides a cement-based ultra-high strength contraction-free grouting concrete which is composed of cement, quartz sand, water reducer, swelling agent, defoamer, anti-settling agent, steel fiber, retarder and water-retaining agent in parts by weight: 100 parts of cement, 5-10 parts of swelling agent, 50-100 parts of quartz sand, 0.5-2.5 parts of water reducer, 0.3-1.0 part of defoamer, 0.1-0.3 part of anti-settling agent, 5-30 parts of steel fiber, 0-1.0 part of retarder and 0.1-0.3 part of water-retaining agent. The invention has the following beneficial effects: (1) at the normal temperature, the 1d compression strength of the cement-based grouting concrete is improved to be above 70 MPa; (2) at the normal temperature, the 28d compression strength of the cement-based grouting concrete is improved to be above 120 MPa; and (3) the cement-based ultra-high strength contraction-free grouting concrete can be used for installing large, ultra-large equipment basis, and can be used for occasions, such as bolt anchoring, structure fastening, road repair and the like which have high requirements on the compression strength of grouting concrete.

The invention provides a pier column pre-casting splicing construction technique working method, which is characterized in that: on a land construction site, a pier body of the whole bridge pier is pre-cast by segments, pier body end heads of each segment are buried with outwardly-extending reinforcement bars, and all segments are transferred to the pier construction site for pier assembly. The working method has the advantages of having light bridge piers, reducing the number of projects, saving manpower, lowering construction costs, having good construction quality and quick construction, solving the problems of reliability, safety, anti-crack property and durability between pier columns pre-cast by segments and between the pier columns and a bearing platform connecting structure, reducing the influence of natural conditions on construction period, reducing construction cost and construction risk, reducing the number of cast-in-situ concrete and equipment such as a hoisting machine and the like and effectively saving cost. Due to the advantages of the splicing type bridge pier and the development of various high strength concrete materials in recent years, the working method is applied to water bridges with large scale, multiple bridge spans, adverse natural environment, and difficult construction due to the influence of wind, wave, current, rain and fog.

The invention relates to an admixture for high early strength of concrete, characterized in that the admixture is formed by mixing and stirring cement clinkers, industrial residues, early strength agents, plaster, water reducing agents and excitants. The parts by weight of the components are as follows: 100 parts of cement clinkers, 500-2000 parts of industrial residues, 0.2-3 parts of early strength agents, 1-3 parts of plaster, 0.2-2 parts of water reducing agents and 1-5 parts of excitants. The excitant is the mixture of aluminum hydroxide, calcium nitrite and calcium nitrate; wherein, the aluminum hydroxide accounts for 50% of the mixture while the calcium nitrite and the calcium nitrate are in any proportion; the early strength agent is the mixture of trolamine, lithium carbonate and calcium formate, wherein, the trolamine accounts for 50% of the mixture while the lithium carbonate and the calcium formate are in any proportion. The admixture for concrete provided by the invention has high activity index and low content of harmful ions. Adding the admixture can obviously improve the demoulding strength, long-term mechanical property and durability of the concrete.

The fully prefabricated assembled steel-steel concrete structure includes two kinds of assembling forms. The first one is fully prefabricated assembled steel column-steel concrete structure, and its prefabricated steel column consists of H-shaped steel column, reinforcing concrete ribs, supporting steel plate and prestress-shearing force friction nodes with shear resisting strips. The second one is fully prefabricated assembled prefabricated steel pipe-concrete column-steel concrete structure, and the prefabricated steel pipe-concrete column consists of steel pipe with square cross section, micro expanding high strength concrete cast inside the steel pipe and shear resisting strips attached to the outer wall of the steel pipe to form preshearing force-friction type nodes. The present invention has raised antiseismic performance, area utilization, construction efficiency, fireproof performance, low cost and small member size, and is suitable for various buildings.

The invention relates to low-viscosity easy-to-pump ultrahigh-strength concrete with average strength of 120MPa. The concrete comprises the following components at single-prescription dosage ratio of kg/m<3>: 400-440 parts of cement, 40-60 parts of silica fume, 60-80 parts of slag micro powder, 100-120 parts of microspheres, 700-750 parts of natural sand with fineness modulus of 2.8-3.2, 980-1,000 parts of stone, 19.5-22.75 parts of additive and 130-135 parts of mixing water, wherein the additive is a polycarboxylate-type high-performance water reducing agent Glenium 8008 and has high water reducing rate, strong viscosity reducing property and high slump retaining property; the expansion degree of the ultrahigh-strength concrete is kept at 700+/-50mm within 4 hours, the back taper time is controlled at 3-8 seconds, the viscosity is kept at 28-35Pa.s, and ultrahigh pumping of 300m and higher is easy to realize. The concrete provided by the invention can meet the performance requirements for ultrahigh concrete pumping of 500m and higher in terms of high slump retaining property, self-compaction property, strength property, low-viscosity property and the like.

The present invention relates to a high efficiency water reducing agent for manufacturing high performance cement based material such as high-strength concrete, fluid state and/or pumping concrete, etc. and method for preparing same. The invention takes ketones compound and aldehydes as condensation monomer, and sulphite as sulphonating agent, and take condensation reaction in alkaline aqueous solution. Then a water-soluble high-polymer condensate containing hydrophilic group such as sulfonic group, carboxy, hydroxyl, etc. in molecule with molecular weight ranging from 3000 to 10000 is obtained. By changing the matching, charging sequence of raw material, the technological process is simplified, the reaction time is shortened, and burst boiling and geling phenomena are also avoided at the same time. By controlling charging rate and condensation temperature, the condensation product is made with required molecular weight and can meet application performance. The fatty group sulphonate condensation compound made by the invention can be served as high efficiency water reducing agent of cement concrete, the water reducing, dispersion and reinforcing effects are better than the traditional albocarbon group high efficiency water reducing agent. The water reducing agent provided by the invention has the advantages of wide raw material source, simple synthesizing process, clean and suitable for industrial production.

Barrier elements provide security from terrorist threats by ability to withstand both vehicle collisions and explosive blasts. Each barrier element is prefabricated to include a massive block of durable material, preferably of high strength concrete, with at least one tunnel extending at least partially between respective cavities in two opposite sides of the block. Each barrier element also includes at least one beam that is preferably made of steel and extends through one such tunnel. Multiple blocks are positionable slidably on top of the ground side-against-side with their beams coupled longitudinally to one another at least approximately end-to-end. Retainer means can be used to block coupling means from entry into the tunnels. Forces from a vehicle collision or an explosive blast can cause barrier elements to rotate relative to one-another when the couplings between beams hinge or bend as the durable material that interferes with the rotation breaks away.

It is an object of the present invention to provide a polycarboxylic acid copolymer which improves the water reducing capacity and workability of cement compositions and the like and making them easier to handle when the fluidity and water reducing capacity are at the same levels, a method of producing the copolymer, and a cement additive and a cement composition comprising the copolymer. The present invention is further to provide a polycarboxylic acid copolymer and a cement additive which are capable of improving the strength and durability of hardening products of cement compositions, hence can advantageously be used in ultrahigh strength concrete. The present invention is still further to provide a method of producing polycarboxylic acid copolymers having high water reducing capacity, reducing the viscosity of cement compositions and improving the workability in applying cement.

The present invention is directed to a polycarboxylic acid copolymer which is obtained by copolymerization of monomer components comprising a polyalkyleneimine unsaturated monomer (A1) and an unsaturated carboxylic acid monomer (B).

Concrete compositions have a fine-to-coarse aggregate ratio optimized for increased workability with minimal segregation and bleeding. The concrete compositions include at least water, cement, coarse aggregate, and fine aggregate and have a slump of at least 1 inch and a 28-day compressive strength of at least about 1500 psi. Workability is improved by minimizing the viscosity as a function of the aggregate content, while minimizing segregation and bleeding. To improve workability, the concrete compositions include between 45% and 65% fine aggregate and between 35% and 55% coarse aggregate as a function of total aggregate volume. For relatively low strength concrete (1500-4500 psi), the fine aggregate is 55-65% of the total aggregate volume. For medium strength concrete (4500-8000 psi), the fine aggregate is 50-60% of the total aggregate volume. For high strength concrete (>8000 psi), the fine aggregate is 45-55% of the total aggregate volume. Overall workability can be maintained or improved even if slump is decreased.

Concrete compositions have a fine-to-coarse aggregate ratio optimized for decreased viscosity and increased workability. The concrete compositions include at least water, cement, coarse aggregate, and fine aggregate and have a slump of at least 1 inch and a 28-day compressive strength of at least about 1500 psi. Workability is improved by minimizing the viscosity as a function of the aggregate content. To improve workability, the concrete compositions include between 45% and 65% fine aggregate and between 35% and 55% coarse aggregate as a function of total aggregate volume. For relatively low strength concrete (1500-4500 psi), the fine aggregate is 55-65% of the total aggregate volume. For medium strength concrete (4500-8000 psi), the fine aggregate is 50-60% of the total aggregate volume. For high strength concrete (>8000 psi), the fine aggregate is 45-55% of the total aggregate volume. Overall workability can be maintained or improved even if slump is decreased.

The invention discloses a quick-hardening high-early strength concrete-based composite material for a maritime work, which mainly comprises the following components in parts by weight: 100 parts of magnesium oxide, 25-50 parts of phosphate, 5-15 parts of retarder, 0.5-3.5 parts of siloyl group moisture repellent, 10-20 parts of flyash, 0-5 parts of glass fibre, 150-350 parts of sea sands and 25-50 parts of seawater. The invention takes the sea sands without desalting treatment as aggregate and the seawater as mixing water, thereby fully utilizing island resources such as sea sands, seawater, and the like, greatly reducing traffic capacity, saving cost. In addition, the invention has the advantages of quick setting and hardening, high early strength, good seawater erosion capability, and the like, thereby being widely applied to quick repatching and building in projects such as island roads, landingstrips, docks, and the like.

The invention relates to a high-temperature-resistant super retarder with favorable dispersibility and a preparation method thereof. The invention aims to provide a high-temperature-resistant super retarder with favorable dispersibility adaptable to high temperature in summer and a preparation method thereof. The high-temperature-resistant super retarder with favorable dispersibility comprises the following components in parts by weight: 300-450 parts of organophosphorous acid or organic phosphorus salt, 150-300 parts of dispersant and 15-25 parts of surfactant. The preparation method comprises the following steps: proportionally adding raw materials into a reaction kettle, uniformly mixing and stirring, adding 300-400 parts by weight of water, and dissolving by stirring to obtain the product. The high-temperature-resistant super retarder provided by the invention solves the problem of high temperature adaptability of the retarder, is convenient for construction in summer, can adapt to multiple water reducers, is applicable to C40 above high-strength concrete, can prolong the retention time of concrete flowability by more than 0.5 hour, is convenient for concrete transportation, and has the advantages of simple production technique and low cost.

The invention discloses high strength concrete and its preparation method, and relates to the technical field of building materials. 1 m<3> of the high strength concrete comprises the following ingredients: 200-300 kg of ordinary Portland cement, 40-50 kg of mineral powder, 15-30 kg of rubber particles, 500-800 kg of fine aggregate, 600-900 kg of coarse aggregate, 20-60 kg of a concrete composite additive, 50-100 kg of polypropylene fiber, 100-200 kg of water, 45-90 kg of phosphorous slag powder, 2-3 kg of a corrosion inhibitor, 5-10 kg of a water reducing agent, and 10-20 kg of a reinforcing agent. According to the prepared concrete product, compressive strength is remarkably raised, cracks are minimized, and life of concrete structures is prolonged. In addition, the preparation method is simple, and production efficiency is high.

The invention relates to external wall decoration of a building and specifically relates to a decorative layer for a brown high-strength concrete decorative hanging plate. According to the scheme, the decorative layer is prepared from the following raw materials in parts by weight: 400-800 parts of cement, 710-950 parts of 10-40-mesh sand, 160-240 parts of 70-140-mesh sand, 110-260 parts of 325-mesh sand, 45-110 parts of a water reducer, 120-160 parts of water and 0-4 parts of pigment iron oxide brown. On the basis of the prior part, the matching form of cement base stock and multi-level specific sand is adopted, and the decorative layer can be tightly connected with the structural layer of an external wall hanging plate, so that the connecting strength can be greatly increased and the stripping can be avoided.

The invention discloses a bridge erection method, which is a prefabricated pier-top beam method. The bridge erection method comprises the following steps of: casting at least two pier columns at intervals; prefabricating pier-top beams, and arranging transverse prestressing tendons in the prefabricated pier-top beams; after the setting of concrete, tensioning the transverse prestressing tendons; arranging supports at the tops of piers, hoisting the pier-top beams, arranging the pier-top beams at the tops of the piers, and temporarily fixedly connecting the pier-top beams and the pier columns by using steel plates and reinforcing steel bars; erecting prefabricated longitudinal deck beams on the pier-top beams; casting in-situ concrete joint surfaces on the end faces of the longitudinal deck beams and the lateral surfaces of the pier-top beams, and casting in-situ early-strength and high-strength concrete in the joint surfaces; after the setting of the concrete in the joint surfaces, tensioning longitudinal prestressing tendons of the longitudinal beams; and removing the steel plates and the reinforcing steel bars. The method greatly reduces the height of a structural building and reduces the deck elevation; and a freely supported structure is changed into a continuous structure by the cast-in-situ concrete so as to improve the integrity of a bridge, prolong the service life of the bridge, solve the problem of stress in construction stages and reduce the cost of engineering construction.

The invention is a rice hull burning device and the nano structural SiO2 rice hull ashes produced by it, and the device includes a burning container, where the bottom board is distributed with many small hole, the inside of the container is distributed with heat exchange water pipes, it regulates the distribution density of these water pipes to control the burning temperature under 600 deg.C in the rice hulls, thus able to ensure the produced rice hull ashes are nano structural rice hull ashes, using the produced heat energy in burning course, and simultaneously solving the problem of limitation to the bulk of a rice hull pile; the produced nano structural SiO2 rice hull ashes contain many about 50 nm-sized SiO2 particles loosely bound together and many holes, where the content of SiO2 exceeds 90%, and has superhigh activity of volcanic ash and strong reinforcement action on ordinary concrete and high-strength concrete, and when the quantity of replacing the cement is 5-20%, can heighten the pressive strength of high-strength concrete by above 10MPa.

The invention discloses a bridge integrally-assembled pier and a construction method. The structural system of the bridge integrally-assembled pier is composed of integrally-assembled PHC pipe piles, assembled bearing platforms, an assembled tie beam, segment prefabricated pier bodies, an assembled cover beam and other components. The assembled bearing platforms, the assembled tie beam, the segment prefabricated pier bodies and the assembled cover beam are connected through steel pipes and a prestressing system. In the installation process, a prestressing tendon penetrates through all the components at first, positioning is completed through steel pipe sleeves under the self weight condition, the prestressing steel tendon is tensioned integrally, and a system is formed. According to the bridge integrally-assembled pier and the construction method, the components all adopt an industrialized production process and an assembly installation process, the construction period is shortened, and environment protecting is facilitated; a part of the components is made of high-strength concrete, so that materials are saved, and the construction cost is reduced; the detachable, replaceable and recycling effects are achieved, and energy saving and emission reducing are facilitated; and the seismic performance of the system is excellent.

The invention relates to a steel-fiber reinforced composite material high strength concrete hollow interlayer combination bridge deck comprising reinforced concrete. A fiber reinforced composite material T-shaped rib is arranged in the reinforced concrete, the T shape upper part of the fiber reinforced composite material T-shaped rib is embedded in the reinforced concrete, the T shape lower part extends from the inside of the reinforced concrete to the outside of the reinforced concrete, a fiber reinforced composite material double-layer hollow plate is connected to the T shape lower part, and a reinforcement which is intersected with the T-shaped rib penetrates through the T-shaped rib. The reinforcement is arranged in high strength concrete and can be used as a principle bar and also a shearing force connecting piece. The invention can be directly used as a plate type beam, or form a combination beam by being connected with a girder and a reinforced concrete beam, can be applied to a great amount of newly-built bridges with middle and small spans, can also replace a damaged old bridge deck to shorten the construction period, accelerate the building and maintenance speed and can also strengthen the durability of a bridge structure.

The aim of this invention is to increase the rigidity of the integrated formworks at the time of their installation, to facilitate the work of the civil engineers in order to determine easily the contribution of the horizontal frameworks and to reduce manufacturing costs. This aim is reached by a formwork including two parallel formwork walls placed one facing the other provided with shaped bars forming the vertical stiffeners and connected by at least one articulated connection device allowing the maintenance of the formwork walls either at a distance defining a space to receive a filler such as concrete, or folded for storage and transport. The connection device is characterized in that it includes a first rectilinear horizontal bar parallel to the first formwork wall and passing through the stiffeners of said first wall, a second rectilinear horizontal bar parallel to the second formwork wall and going through the stiffeners of said second wall, said second bar being situated facing the first bar, and a plurality of connection bars perpendicularly linking the two horizontal bars, said connection bars being articulated around said horizontal bars.

The invention discloses a viscosity reduction type polycarboxylate superplasticizer used for high -strength concrete. The polycarboxylate superplasticizer is prepared from, by weight, 20.0-40.0 parts of water reduction type PCE mother liquor, 2.5-5.0 parts of viscosity reduction type PCE mother liquor, 2.5-15.0 parts of slump retaining type PCE mother liquor, 0.02-0.05 part of air entraining agent, 0.02-0.05 part of antifoaming agent, 0.5-0.8 part of thickening time control agent, 0.01-0.02 part of corrosion inhibitor, 0.01-0.02 part of antiseptic and proper amount of water. According to the viscosity reduction type polycarboxylate superplasticizer, three kinds of mother liquor of the water reduction type PCE, the viscosity reduction type PCE and the slump retaining type PCE are adopted, proper evacuation time required by the high-strength concrete can be obtained by adjusting the ratio of the three kinds of mother liquor according to practical conditions of raw materials such as binding material and aggregate, and viscosity of the high-strength concrete is controlled.

The invention discloses a novel melamine super plasticizer modified by carboxylic acid. The melamine super plasticizer is made by reacting a primary material of melamine with amino sulfonic acid, sodium bisulfite, salicylic acid, citric acid, phenol, self-made sulphonating agent, formaldehyde and caustic soda liquid at a certain temperature and a certain pH value. The novel melamine super plasticizer modified by carboxylic acid has the characteristics of high water reducing rate, good adaptability and good water retentivity and has better effect when used in large concrete member having relatively high requirement on surface finish quality and high-strength concrete and self-compacting concrete.

The invention discloses a prefabricated reinforced concrete column and column splice joint adopting connection of embedded corrugated sleeves and high-strength reinforcement. The splice joint mainly comprises a prefabricated reinforced concrete upper column, a prefabricated reinforced concrete lower column, steel sleeves, the embedded corrugated sleeves and the high-strength reinforcement. An installation method of the splice joint comprises the following steps: in a factory, realizing the embedded high-strength reinforcement by a method of firstly pouring non-shrinkage self-compacting high-strength concrete into the embedded corrugated sleeves of the prefabricated reinforced concrete upper column and then inserting the high-strength reinforcement; and at the construction site, grouting the corrugated sleeves of the reinforced concrete lower column, inserting the embedded high-strength reinforcement of the upper column in the corrugated sleeves of the lower column and simultaneously welding the steel sleeve joint parts on the outer surfaces of the columns, thus realizing prefabricated reinforced concrete column and column splicing. The splice joint has the beneficial effects that all the used components are assembled and connected on the site, thus reducing reinforcement assembling and formwork supporting on the site, improving the building industrial assembly efficiency and reflecting the novel building concepts of environment friendliness and energy saving of building components.

The invention discloses a method for detecting a test pile stress and strain of a PHC (Prestressed High-Strength Concrete) pipe pile, and the method comprises the following specific steps of: 1) lofting: marking the positions of each detection point and routing on the surface of the PHC pipe pile; 2) grooving: grooving the PHC pipe pile along the lofting; 3) connecting line: connecting optical fiber grating sensors arranged according to the predetermined order by an optical fiber to form a detection line; 4) paying-off and testing: putting the detection line in the marked position in the groove and testing whether the optical fiber grating sensors work normally; 5) fixed routing: putting the detection line in the groove in a position which should be at least 5 mm lower than the surface of the PHC pipe pile; 6) glue preparation: pouring glue in the groove, and pasting the optical fiber grating sensors, thereby fixing the sensors; 7) detection: performing stress and strain detection by means of the optical fiber grating sensors and sending out the detection data through the optical fiber. According to the method, the advantages of the optical fiber grating sensors are utilized and combined with the characteristics of the armored optical fiber and a detection line is formed integrally, and the method has the advantages of simplicity, feasibility, high efficiency and the like.

The invention discloses a composite mineral admixture for concrete. The composite mineral admixture comprises the following components in percentage by weight: 15-20% of cement clinker, 30-40% of mineral powder, 8-15% of silica fume, 20-30% of limestone powder and 15-25% of fly ash, wherein the limestone powder is obtained by processing mining debris. According to the composite mineral admixture disclosed by the invention, the gel material is added at a proportion of 20-40%, so that the economic benefits are remarkable while the production needs of high-performance concrete and high-strength concrete are met, and the economic and social benefits are also very high; by adopting the composite mineral admixture, the use of cement is reduced; and by mass utilization of industrial wastes such as mineral powder, limestone powder, fly ash and relatively low-quality silica fume, the waste of resources is reduced, and the sustainable development of the concrete industry is promoted.

The invention relates to a high-strength concrete and a preparation method thereof. The high-strength concrete formula is characterized by comprising the following raw materials in percentage by weight: 10-40 percent of cement, 1-10 percent of mineral powder, 10-65 percent of fine aggregate, 0-50 percent of rough aggregate, 1-10 percent of water reducing agent and 1-10 percent of water. The preparation method comprises the following steps of: putting all dry materials into a stirrer by the proportion and dry-mixing for 5-10min; adding water accounts for 60 percent in the total water weight into the stirrer and mixing the materials for 5-10min; uniformly mixing the water reducing agent and water accounts for accounting 30 percent in the total water weight and adding an obtained mixture into the stirrer; washing a container used for preparing the water reducing agent by using water accounts for accounting 10 percent in the total water weight, and adding liquid after washing into the stirrer; and stirring the mixture until the mixture is in a viscous state. By adopting the formula and the preparation method, the high-strength concrete with the compression strength of 125-270MPa is prepared, and different compression strengths are achieved through changing the grain size of the fine and rough aggregates, the type and the proportion of the cement. The high-strength concrete can be widely applied to high-strength construction of modern requirements.

The invention discloses a self-resetting multidimensional damping pipe pile group foundation and a construction method, and belongs to the technical field of building seismic resistance. The foundation comprises a bearing platform, a PHC (prestressed high strength concrete) pipe pile, damping supports and a damping ground anchor, wherein the damping supports are connected between peripheral foundation piles and the bearing platform, and each damping support comprises an upper seal plate, a lower seal plate, a soft steel core rubber pad, radial reset springs, an outer sleeve and an inner sleeve and extends into a groove in the bottom of the bearing platform, and the bottom of each damping support is arranged at the top of the corresponding pile through the corresponding inner sleeve in a sleeving manner for fixing; the damping ground anchor below a central pipe pile comprises a shearing damper and anchor rods, the shearing damper comprises vertical reset springs, soft steel clamps and steel clamping grooves, the ground anchor is used for penetrating into the soil layer at a pile end of the central pipe pile, and the upper end of the ground anchor is anchored on the top surface of the bearing platform through a steel pulling cable. By means of the foundation and the construction method, vibration energy during reciprocating motion of seism is effectively absorbed, the multidimensional damping effect of the pile group foundation is realized, pile-bearing platform joints with ductile energy consumption capacity are formed, and the problem that pipe pile heads are prone to seismic damage under the action of strong seism is solved.

The invention discloses a high-durability pre-stressed high-strength concrete pipe pile. The invention is constituted by additive constituted by cementing material, water reduction agent of naphthalene sulfonated formaldehyde condensate and triterpenoid saponin non-ion surface active air-entraining agent, sand and stone, and water by centrifugal casting, steam curing and steam pressing. Addition amount of additive is 1.0-1.2 wt% of cementing material. The high-durability pre-stressed high-strength pipe pile is provided with good permeability resistance, sulfate-corrosion resistance and frost resistance in phase.