48results about How to "Avoid temperature cracks" patented technology

The invention discloses a high-temperature retarding and water reducing agent prepared by mixing the following raw materials in parts by weight: 35-45 parts of polycyclic aromatic hydrocarbon sulfonated formaldehyde condensates, 20-30 parts of acyclic hydroxyl sulfonate condensates, 10-15 parts of diethylenetriaminepenta(methylene-phosphonic acid), 8-16 parts of calcium saccharate, 12-18 parts of alunite powder, 5-10 parts of xanthan gum powder, 4-8 parts of barium metaborate, 3-6 parts of sodium lauryl sulfate, 2-4 parts of pentaerythrite di-n-stearate, 6-12 parts of maleic anhydride-styrene sulfoacid copolymers, 10-15 parts of blast furnace slag powder, 5-10 parts of waste saccharide slag powder, 7-13 parts of nekal and 4-7 parts of auxiliary. The water reducing agent disclosed by the invention is excellent in high temperature resistance, relatively wide in applicable temperature range (150-250 DEG C), capable of reducing cement hydration heat release, reducing the temperature stress of the concrete, avoiding generating temperature cracks and completely meeting the construction requirement for high-temperature and high-pressure well cementation, suitable for continuously pouring mass concrete under a high temperature condition, remarkable in water reducing enhancement effect, good in slump loss resistance and wide in market prospect.

The invention discloses a high-strength concrete composite material which comprises the following components in parts by weight: 100 parts of cement, 1-5 parts of fiber, 2-20 parts of silica fume, 1-20 parts of coal ash, 1-10 parts of composite rare earth, 10-20 parts of magnesium silicate granules, 140-200 parts of sand, 140-200 parts of macadam and 30-50 parts of water. The product is high in anti-cracking ability and small in loaded crack width and has long-term durability. Moreover, the interaction of composite concrete is improved, the material performance is far higher than basic performance of common concrete, main indexes of the concrete are obviously improved, a temperature crack is avoided, and the strength, freezing resistance and anti-permeability of the concrete are guaranteed.

This invention publicized one kind of non- temperature crack Tong roofing in roofing board on to reserve certain scoop channels from the waterproofing, in the scoop channel the establishment and the scoop channel close coordination elastomer. This invention states roofing board on covers has looks for the slope level. States the elastomer by the rubber material, the damping part, the polyurethane is made, also may be the PVC tube. This invention Tong roofing board the expansion and contraction distortion which will produce under the open air temperature function, through will reserve the scoop channel to carry on the decomposition, each scoop channel will undertake part of distortions, because the elastomer elasticity far will be bigger than Tong, the roommate kneading board scoop channel distortion passable elastomer reverse distortion has been able freely to realize, has the foreword to release in the roommate kneading board the temperature stress, thus has avoided the roommate kneading board temperature crack production, will achieve roofing counter- from the waterproof goal. This invention structure simple, practical, is easy to construct, compares the cost with the traditional waterproofing form lowly, the durable performance better, turns on the water the effect to be better.

The invention discloses a construction process of a non-uniform settlement control structure for an airfield pavement roadbed passed by a high-speed rail tunnel. The construction process comprises thefollowing steps: cleaning and leveling a construction site, and pouring plain concrete; dismantling part of foundation pit maintenance walls; filling a plain soil above the plain concrete in a layered mode, pouring a foam light soil foundation on the plain soil in a segmented, partitioned and layered mode, or laying reinforced soil layers in a layered mode, laying geogrids between the reinforcedsoil layers in a layered mode, laying geocells on the reinforced soil layers in a layered mode, laying broken stones on the geocells, and setting a plurality of deformation joints in the longitudinaldirection; carrying out construction of a pavement structure layer and other ancillary facilities, and forming the roadbed non-uniform settlement control structure after the construction process is finished. The construction process has the advantages that the overall uniformity of the soil foundation is improved, and the non-uniform settlement volume of the soil foundation is adjusted; the construction process is convenient, the construction period is shortened and the problem of uneven settlement of the roadbed when the high-speed rail tunnel passes through the airfield pavement is successfully solved.

The invention discloses a maintenance device for foam in inner-layer well wall concrete of a freezing shaft. The maintenance device for the foam in the inner-layer well wall concrete of the freezing shaft comprises a liquid foam layer, a foam maintenance drum, a foam original solution storage vessel, a foam generator and a warm water pipe. The foam maintenance drum comprises a drum wall and a drum bottom. The drum bottom is located at the outer side of the drum wall and is fixedly connected with the drum wall. The liquid foam layer is formed between the concrete inner-layer well wall and the drum wall of the foam maintenance drum. The foam maintenance drum is arranged at the inner side of the concrete inner-layer well wall and is hung at the lower portion of a form stripping disk. A liquid inlet of the foam generator is communicated with a liquid outlet of the foam original solution storage vessel and fluid in a water outlet of the warm water pipe. According to the maintenance device for the foam in the inner-layer well wall concrete of the freezing shaft, a good maintenance condition is provided for the inner-layer well wall concrete of the freezing shaft, a plenty of water can be saved, and at the same time, temperature cracking caused by different temperatures of the inside and the surface of the concrete inner-layer well wall, so that the quality of the shaft is guaranteed.

The invention discloses a steel slag semi-flexible composite pavement structure. The pavement structure sequentially comprises an asphalt concrete surface layer, a steel slag semi-flexible layer, a three-dimensional porous material layer, an old cement board layer subjected to fragmentation and a steel slag base layer from top to bottom, wherein the asphalt concrete surface layer is provided witha structure depth; glass beads loaded with nano titanium dioxide are embedded in the structure depth; three-dimensional communication structures are formed among pores of the three-dimensional porousmaterial, wherein the communication porosity is 50-99%, and the pore diameter is 0.1-20 mm; a specific composite structure layer is adopted, therefore, the shrinkage caused by cooling is relatively small, and relatively small temperature stress is generated to avoid temperature cracks; meanwhile, through interaction of different structural layers of all the layers, mutual tensile stress exists among all the layers, and fatigue cracking can be relieved by combining with use of specific functional materials; and the steel slag semi-flexible composite pavement has excellent high-temperature stability, low-temperature crack resistance, fatigue durability and water stability.

The invention discloses activate micro powder prepared through wind quenching method steel slag and directly-discharged pulverized fuel ash and a method. A raw material comprises 60 to 70% of steel slag, 20 to 30% of pulverized fuel ash, 16 to 20% of lime mixture and 0.1 to 0.3% of polycarboxylate superplasticizer powder by mass percent, the raw material is added into a weightless mixing stirrer,stirring is carried out to enable the material to be sufficiently mixed to be uniform, through a wind quenching method, the amorphous mineral phase on the surface of the steel slag is obviously increased, potential activity is increased, through a grinding aid, reinforced fibers, the polycarboxylate superplasticizer powder and monox, the activity is higher, compatibility with cement is good, the pulverized fuel ash delays the hydration speed, the temperature rise caused by heat transmission by water of the concrete can be reduced, temperature cracks generated by the concrete can be prevented,binding force of the concrete can be obviously improved, durability is improved, and for solving the problem that the grinding effect is affected due to the inconsistent steel slag sizes, and a screening auxiliary device for smashing of the steel slag is specially made

The invention discloses a production process of laminated boards under a low-temperature condition, and relates to the technical field of prefabricated laminated boards. The production process includes the steps of erecting molds, laying reinforced concrete trusses and pouring concrete in the molds, maintaining through temperature control, demoulding and the like. The cementitious materials of theconcrete are slag cement; the concrete is mixed with 15%-20% high-quality fly ash; and layered pouring is carried out in pouring concrete, and the longest interval between layers is less than the initial setting time of the concrete. According to the production process of the laminated boards under the low-temperature condition, the production efficiency of the laminated boards is improved, the structural strength of the laminated boards is ensured, the temperature cracks are effectively avoided, and the production cost is greatly reduced.

The invention discloses a concrete pumping retarder, and relates to the technical field of concrete admixtures. The concrete pumping retarder is prepared from, by weight, 40 parts to 50 parts of soybean molasses, 30 parts to 40 parts of isomaltitol, 20 parts to 25 parts of sulfonated melamine, 15 parts to 20 parts of tephra, 15 parts to 20 parts of modified starch, 13 parts to 17 parts of polyacrylamide, 12 parts to 15 parts of fatty alcohol-polyoxyethylene ether, 12 parts to 15 parts of microcrystalline cellulose, 10 parts to 13 parts of fructus gleditsiae powder, 10 parts to 13 parts of tea seed powder, 8 parts to 11 parts of naphthalene water reducers, 6 parts to 10 parts of nanometer rubber powder, 6 parts to 10 parts of polycarbamate, 5 parts to 8 parts of palmitic acid, 15 parts to 20 parts of coconut oil and 300 parts to 400 parts of water. The prepared retarder is free of chloride and alkali, the setting time of concrete can be effectively prolonged, heat of hydration can be reduced, generation and development of temperature cracks of the concrete can be greatly reduced and even avoided, the workability of the concrete can be further obviously improved, the bleeding rate can be greatly reduced, and endurance performance such as freezing resistance and corrosion resistance can be improved.

The invention relates to a fabric concrete block and a preparation method. The block has high crush resistance strength, no holes and pitted surfaces, good appearance quality and strong wall adhesionability, and can restrain wall cracks and prolong wall life to enable the block is matched with the service life of a main structure. The block comprises four L-shaped angle shafts arranged to form arectangular barrel corner angle, a fabric shell which is fixed outside the L-shaped angle shafts in tension winding mode and form a rectangular barrel structure and filler, wherein the fabric shell isfilled with the filler.. The preparation method comprises the steps that 1, the preparation of the fabric shell is carried out; 2, the fabric shell is filled with the filler, pressing and concrete vibrating are carried out to enable the filler to be compact, so that the fabric adheres to the inner wall of a steel mould; and 3, maintenance is carried out for molding, maintenance is carried out until the initial solidification of the filler is completed, the steel mould is removed, maintenance is carried out until the filler is fully solidified, and the block production is completed.

The invention discloses a temperature-control anti-cracking curing method for mass concrete. According to the temperature-control anti-cracking curing method, according to the construction steps and requirements of mixing, temperature measuring and curing of the concrete, by adopting a concrete formula with a small cement dosage and applying a high-tech temperature measuring means, the temperature change which cannot be seen or touched inside the concrete is visualized, and a high-molecular moisturizing material and a heat-preservation rainproof material are combined for use, so that moisturizing and heat-preservation curing is carried out under the guidance of visualized temperature information, and the purposes of not using a cooling water pipe, reducing the temperature difference between the inner surface and the outer surface and avoiding temperature cracks after the concrete is hardened are achieved. According to the temperature-control anti-cracking curing method, the cooling water pipe does not need to be embedded, the technology is simple, the operation is controllable, the cost is saved, the performance is reliable, and no temperature crack occurs in the construction of a plurality of mass concrete.

The invention discloses bio-filler for absorbing and degrading hydrophobic organic waste gases, and a preparation method of the bio-filler. The bio-filler is prepared from the following raw materials:modified iron-based beta-cyclodextrin, diatomaceous earth, biochar, ceramsite, calcium oxide, silicate inorganic gel and water. The preparation method of the bio-filler comprises the following steps:dissolving the modified iron-based beta-cyclodextrin and the calcium oxide to obtain sol A; evenly mixing the diatomaceous earth, the biochar and the silicate inorganic gel to obtain powder B; dipping the ceramsite into the sol A for 5min, then placing the product in a drum granulator for granulating together with the powder B, spraying the sol A in the granulation process so as to obtain preliminarily-cured gel granules, and curing to obtain the bio-filler for absorbing and degrading the hydrophobic organic waste gases. The bio-filler prepared by the method can be widely applied to various types of organic waste gas biological purification systems, and enables the hydrophobic organic waste gases to more easily penetrate a wet water film on the surface of the filler and be in contact withmicroorganisms so as to enable the hydrophobic organic waste gases to be subjected to efficient catalytic degradation.

The invention provides a heat preservation composite formwork and a concrete construction method applied to a strong wind forest area, and belongs to the technical field of civil construction. The heat preservation composite formwork comprises a formwork body, heating units and a plurality of supporting units; concrete is poured into the formwork body, a plurality of supporting units are arrangedon the periphery of the formwork body and used for supporting the formwork body, and a heat preservation layer is arranged between every two adjacent supporting units; a plurality of fixing plates arearranged between the formwork body and the supporting units; the heating units are arranged on the fixing plates and used for heating concrete poured in the formwork body. The invention further provides the concrete construction method applied to the strong wind forest area, and the construction method adopts the heat preservation composite formwork. According to the heat preservation composite formwork and the concrete construction method applied to the strong wind forest area, the formwork body is not prone to deformation in the concrete pouring process, and the internal and external temperature difference of the concrete in the pouring process is reduced.

The invention provides a cast-in-place construction method of a cast-in-place concrete bridge, and relates to the technical field of building construction. The cast-in-place construction method of the cast-in-place concrete bridge comprises the following steps that a full framing is erected, bottom formworks are sequentially installed on the full framing according to a bridge design drawing, the full framing is pre-pressed and adjusted, then webs and inner formworks are installed on the bottom formworks, and a steel reinforcement framework is installed; concrete pouring operation is sequentially carried out from low to high, in the pouring process, concrete pouring is carried out for the first time, a layered dislocation method is adopted, after 5-10 m of bottom formworks are poured, pouring of webs is completed in a layered mode, and after pouring of the last section of bottom formworks and webs is completed, circulating construction is carried out till concrete pouring of all structures is completed. According to the construction method, the pouring construction period of the box girder can be obviously shortened while the construction quality of the box girder is guaranteed, and the construction efficiency is improved.

The invention provides mass concrete and a preparation method thereof, and the mass concrete is characterized by comprising the following components in parts by weight: 170 KG/M < 3 > of water, 308 KG/m < 3 > of cement, 70 KG/M < 3 > of mineral powder, 56 KG/M < 3 > of fly ash, 10.3 KG/M < 3 > of an admixture, 694 KG/M < 3 > of sand and 1076 KG/M < 3 > of stone. The performance of the mass concrete produced according to the invention can meet the requirements of strength grade, impermeability, volume stability and the like, and the hydration temperature rise of a cementing material is also controlled, so that the purposes of reducing temperature and pressure and preventing temperature cracks are achieved.

The invention discloses a special grinding aid for maritime work cement and a preparation method of the special grinding aid. The special grinding aid for maritime work cement is prepared from the following raw materials: 5-9% of grinding aid mother liquor, 13-18% of an industrial salt, 3-9% of a superplasticizer, 7-15% of slag powder, 3-5% of limestone powder, 3-8% of silica fume and 36-66% of fly ash; specifically, the percentages are mass percentages. By using the superplasticizer with high dispersion performance, cement particles can be highly dispersed, and in addition, through dispersionpermeation, charges carried by the cement particles are neutralized, so that the agglomeration phenomenon is reduced. Slag powder, limestone powder and fly ash are used, so that hydration heat of marine cement can be remarkably reduced, adiabatic temperature rise in concrete is reduced, temperature stress caused by internal and external temperature difference is reduced, generation of concrete temperature cracks is prevented, the overall integrity of a concrete structure is guaranteed, therefore, the corrosion resistance and the durability of the concrete structure are effectively improved.