259 results about "Roller-compacted concrete" patented technology

This invention relates to a method for preparing low-grade concrete by utilizing industrial-residues, such as: red mud (from sintering process aluminium production), residue from chlorine-alkali process for producing alkali, carbide slag, pyrite cinder, waste slag of titanium oxide and coal ash and the like. The water content of these residues is regulated and they are proportioned, mixed evenly by mechanical agitation and added no binder suchas cement, lime or asphalt to produce this inventive products. This product can be used as basic material under road structure, foundation earth; or for producing low grade concrete, baking-free bricks, building-blocks with the strength being up to 13MPa. Advantages are: simple process, low cost, wide use, high utilization rate of industrial wastes, no secondary pollution.

The invention relates to a retarding superplasticizer composition for roller compacted concrete, which is prepared from 40-80 percent of barium-containing naphthalene based superplasticizer, 10-30 percent of modified lignosulfonate, 3-7 percent of plastic retaining agent, 5-15 percent of composite retarder, 1-7 percent of layer silicate mineral material, 0.1-0.5 percent of polysiloxane and 0.1-0.2 percent of air entraining agent. The retarding superplasticizer composition does not contain alkali harmful to alkali-aggregate reaction, has a better inhibition effect to the alkali-aggregate reaction, and has the advantages of high water reducing rate, strong VC value retaining capacity, good water retaining property, small bleeding rate, remarkable retarding effect and the like, so that the prepared roller compacted concrete mixture has the characteristics of good workability, small VC value loss, small bleeding rate, long setting time, greatly reduced early hydration heat and delayed occurrence time of a hydration heat peak, so as to have better construction property, mechanical property and durability.

The invention provides a comprehensive evaluation method of roller compacted concrete dam layer characteristics and states. The comprehensive evaluation method comprises the following steps of (1) determining target problem influencing factors and layers, sufficiently considering influencing factors of the roller compacted concrete dam layer characteristics and states in practical engineering, and building a deformation index, transfusion index and stress index layering evaluation system; (2) determining estimation scales, standards and measuring methods of evaluation indexes; (3) building a deformation, transfusion and stress monitoring model for roller compacted concrete dam; (4) adopting a G1 method to empower the evaluation indexes; and (5) conducting comprehensive evaluation on the roller compacted concrete dam layer characteristics and states through cloud model conversion of ground floor evaluation indexes and comprehensive cloud calculation of a last layer indexes. The comprehensive evaluation method is based on a cloud model and uses real time monitoring data of the roller compacted concrete dam to serve as an analysis basis, overcomes the defect that a traditional method can only evaluate certain point or certain time of the roller compacted concrete layer, and achieves dynamic and comprehensive evaluation of the roller compacted concrete dam layer characteristics and states.

The invention discloses a cement concrete pavement structure provided with continuous steel bars. The pavement structure comprises a base layer. Roller compacted concrete is adopted in the base layer. A broken stone hardcore is laid below the base layer. Cement concrete surface layers are laid on the base layer. The cement concrete surface layers include the upper surface layer and the lower surface layer. Rubber cement concrete is adopted in the upper surface layer. A transverse induction kerf is arranged on the edge of the upper surface layer on the left side of the driving direction. The continuous transverse steel bars, the continuous longitudinal steel bars and a slidable support are arranged at the portion, within the range of a carriageway and one half of the width (L) of a hardened verge, of the lower surface layer. Plain concrete is formed at the portion, within the other half of the width (L) of the hardened verge, of the lower surface layer. A longitudinal joint is arranged at the portion one half of the width of the hardened verge. A bituminous concrete anti-scouring layer is arranged between the base layer and the surface layers. The pavement structure can solve the problems of existing cement concrete pavements and continuous reinforced concrete pavement structures and can be widely applied to high-grade highways, tunnel pavements and the like on the heavy-duty traffic condition.

The invention discloses novel roller-compacted concrete for dams and a preparation method thereof. The novel roller-compacted concrete comprises the following components in parts by weight: 60-110 parts of water, 51-59 parts of cement, 70-120 parts of fly ash, 500-700 parts of river sand, 1400-1500 parts of coarse aggregates, 0.876-1.46 parts of a set retarding superplasticizer and 0.02-0.04 part of an air-entraining agent. The preparation method of the novel roller-compacted concrete comprises the following steps: firstly, crushing river sand by using a crusher so as to form a finished sand product; and mixing the finished sand product with other components so as to form the novel roller-compacted concrete. According to the invention, the quality of sand is improved, no water source is consumed, no dust is produced, and an effect of energy conservation and environmental protection is achieved.

The invention discloses a micro-collapse concrete of rolled concrete dam and constructing method, which comprises the following parts: cement, coal ash, rough aggregate, fine aggregate, slow setting high-effective dehydragent, air-entrainer and water, wherein the slump of allocated concrete is less than 0. 5cm with consistency value VC at 1-3s; the allocation of the micro-collapse concrete is similar to internal rolling concrete of dam through adding some gelling material slightly, which saves cost with high quality obviously.

The invention provides four-graded roller compacted concrete suitable for water power hydraulic engineering, the four-graded roller compacted concrete per cubic meter comprises the following components: 49kg-64kg of cement, 78kg-92kg of fly ash, 70kg-71kg of water, 630kg-700kg of sand, 1520kg-1610kg of gravel, 0.98kg-1.42kg of a high efficiency water reducing agent and 0.07kg-0.14kg of an air entraining agent, the mass ratio of super large stone (80mm-120mm): large stone (40mm-80mm): middle stone (20mm-40m m): small stone (5mm-20mm) is 20:30:30:20. The four-graded roller compacted concrete is low in cementitious material use amount and low in adiabatic temperature rise, has good working performance, mechanical performance and durability, and can simplify the temperature control measures, improve the construction progress, and reduce cost.

The RCC construction site time detection method has the following steps: (a) pre-embedding the probe (1) on the paved RCC surface (2); (2) recording the mixing RCC water time as the testing initial time; (3) interval using the rotation moment detector (3) to measure the probe rotary torque value; (4) probe detection; (5) using the obtained testing data to draw 'Torque(N*m)~time(h) curve', the curve having two inflection points, and taking the corresponding time of the first inflection point as the RCC initial time, and providing the effective process control basis to the RCC coverage time. It accurately assures the combination quality between the RCC layers, and fresh concrete without screening and the method is easy to grasp, and the site trial proves the testing results being accurate.

The invention discloses an integrated roller compacted concrete dam construction quality evaluation method taking regard of parameter uncertainty. The method comprises steps that firstly, a roller compacted concrete dam construction quality evaluation index system is constructed, secondly, a compactness nonlinear regression model and an interlayer combination quality index nonlinear regression model are established, thirdly, concrete attribute parameter uncertainty of a roller compacted concrete dam is processed, and a roller compacted concrete dam construction quality evaluation model based on the blind number theory is established; and lastly, integrated roller compacted concrete dam construction quality evaluation is carried out. The method is advantaged in that further development of construction quality evaluation researches is facilitated, a matching degree between the acquired evaluation result and an actual situation is relatively high; based on mathematics uncertainty, influence of compactness quality and interlayer combination quality on construction quality is considered, integrated evaluation on dam surface construction quality is realized, and an effective technical means is provided for construction quality control.

The invention discloses a polycarboxylate water reducer for small-slump concrete, and a preparation method thereof. The water reducer is prepared from the following raw materials in parts by weight: 120-180 parts of methoxypolyoxyethylene ether, 0.5-0.8 part of catalyst, 0.1-0.3 part of polymerization inhibitor, 5-10 parts of water-carrying agent, 17-35 parts of one or two of unsaturated acid and anhydride, 14-20 parts of functional monomer, 0.8-1.5 parts of initiator, 0.8-1.6 parts of chain transfer agent, and 286-322 parts of deionized water. The invention further provides a preparation method of the water reducer. The polycarboxylate water reducer can be used in a constructional engineering in which the initial slump of concrete is less than 180mm, the polycarboxylate water reducer has good workability and flowing retentivity, thus expanding the applications of the polycarboxylate water reducer in the small-slump concrete engineering, such as applications in the fields of large-volume concrete, prefabricated member concrete, roller-compacted concrete and the like. The preparation method is simple in production technology, the reaction conditions are easily controlled, and no environment-friendly pollution occurs.

The invention discloses roller-compacted concrete and a preparation method thereof, and relates to the technical field of concrete. The roller-compacted concrete is prepared from the following raw materials in parts by weight: 258-270 parts of cement, 40-48 parts of fly ash, 34-42 parts of an admixture, 1650-1986 parts of filler, 0.5-3 parts of an air entraining agent, 1-2.6 parts of an anti-cracking agent, 0.47-3.27 parts of a waterproof agent and 175.2-189.4 parts of water. According to the roller-compacted concrete, the usage amount of the fly ash can be reduced, cost is reduced, and good compression resistance and bending resistance are achieved. The preparation method comprises the following steps: weighing the components according to a set ratio, and uniformly mixing the cement, thefly ash, the admixture and the filler to obtain a mixed material I; uniformly mixing the air entraining agent, the anti-cracking agent and the waterproof agent to obtain a mixture II; and uniformly mixing the mixture I, the mixture II and water by stirring to obtain the compacted concrete. The preparation method has simple steps and is easy to implement.

The invention discloses a seepage-proofing method of an underwater reservoir and an underwater reservoir with a seepage-proofing function, wherein the method comprises the following steps: step a, paving impervious concrete on a rock stratum at the reservoir bottom; step b, paving roller compacted concrete on the side wall of the reservoir; step c, paving a first impermeable geomembrane on the roller compacted concrete; step d, paving normal concrete on the first impermeable geomembrane; step e, paving a second impermeable geomembrane on the top of the reservoir; and step f, paving smolmitza on the second impermeable geomembrane. By paving the impervious concrete on the bottom of the reservoir, paving the roller compacted concrete, the first impermeable geomembrane and the normal concrete on the side wall of the reservoir, and paving the second impermeable geomembrane and smolmitza on the top of the reservoir, the water seepage is effectively avoided, and the water quality is protected.

The invention provides a roller compacted concrete cushion changing and filling method, which relates to a foundation processing method, in particular to a changing and filling method of a large-area shallow soft foundation and an uneven foundation. The roller compacted concrete cushion changing and filling method comprises the following steps of: checking a foundation trench; excavating the foundation trench and an earthwork; mixing changing and filling materials; spreading; and rolling and compacting. The changing and filling materials comprise the following components in parts by weight: 90-120 parts of water, 80-120 parts of cement, 200-250 parts of fly ash and 1900-2300 parts of graded broken stone or 90-120 parts of water, 80-120 parts of cement, 2100-2300 parts of sand mixing stone. The roller compacted concrete cushion changing and filling method has high bearing capacity, low cost and quick construction period.

The invention discloses a method for determining a road roller compacted concrete composition based on a pressing vibration method. The method comprises the following steps of: placing samples into a volume tube in two layers, placing on-load press cakes on the surfaces of the samples, starting a vibrating table, measuring the head room of the volume tube, respectively determining the height of a first layer and the height of a second layer, leveling the surfaces of the samples, removing the samples and the volume tube together from the vibrating table, weighing the mass of the volume tube and the samples, taking out the samples, determining the volume of the roller compacted concrete sample, removing the sample, weighing, determining the water content, calculating the dry density, and with the dry density of the sample as the vertical coordinate and the water content of the sample as the horizontal coordinate, selecting the composition with large compactness and thickness satisfying the requirements as the compacted concrete composition according to test. The method disclosed by the invention ensures that the road roller compacted concrete composition has large compactness, meanwhile, the thickness of the road roller compacted concrete also can meet the construction requirements, and the method is simple and feasible to operate.

Disclosed are wax emulsion modifiers for concrete and cement formulations and methods for preparing the same. The modifiers are applicable to roller compacted concrete (RCC), used for manufacturing of industrial floor slabs, dams and roads. This invention also relates to conventional Portland cement concrete mix designs or other applied concrete mixes for formed structural shapes and transport road mix designs, providing a more rapid dehydration of the aqueous phase, without sacrificing strength, yet providing a higher density that remains workable at the point of application. The modifier of the invention may be utilized for either the initial soil/cement base or for the final/finished placement.

The invention relates to the field of dam construction quality control, in particular to a coupling rolling wheel vibration dam material compaction quality real-time detection device. The problem thatrepresentation compaction quality errors are caused since the vibration frequency f of a rolling machine is changed is avoided, the earth and rockfill dam or rolling concrete dam compaction quality is detected in real time, and a powerful guarantee is provided for ensuring dam construction quality. The coupling rolling wheel vibration dam material compaction quality real-time detection device iscomposed of a rolling vibration acceleration sensor, a GNSS positioning module, a vehicle-mounted integrated controller module, a wireless communication module and a rolling machine power module. Therolling vibration acceleration sensor is installed on the portion, not rotated along with a vibration wheel, on the vibration wheel of the rolling machine. When dam materials are vibrated and rolled,vibration acceleration time domain analog signals in the vertical direction of the rolling wheel are collected in real time and converted into time domain digital signals, and the acceleration time domain analog signals and corresponding sampling time in one sampling period are transmitted into the vehicle-mounted integrated controller module through an interface. The coupling rolling wheel vibration dam material compaction quality real-time detection device is mainly applied to construction quality control occasions.

The invention relates to a roller compacted concrete coring craft. The single pipe drill tool is formed by butt jointing a plurality of short core pipes with the length 0.25-0.4m and higher two ends whorl concentricity, wherein the total length of the drill tool is 8m-10m; the drill tool accumulating line degree deviation id less than 5mm; it arranges a single moving stabilizer between two drill rod columns which has the same diameter with the drill tool; it arranges a bending apparatus before winding the opening after coring; it arranges an un-coring apparatus after coring which comprises the step of taking apart the rubber piston with interface length 20-30cm and the external diameter less than the inner diameter of core pipe and putting it on the core pipe of the concrete core upper part, fixing the joint and the glued joint, using the constancy of pump and fluid transmission to slowly press the concrete core out of the core pipe by the speed of 30cm/min.

The invention discloses a concrete dam compaction quality rapid prediction method capable of considering parameter uncertainty influences. The concrete dam compaction quality rapid prediction method capable of considering parameter uncertainty influences comprises the main steps: constructing an original data set; establishing an evaluation index system; analyzing and quantifying uncertainty; establishing a quality rapid evaluation model solved by using a random forests algorithm; and establishing a quality full-dam-surface rapid evaluation model. Parameter uncertainty is considered, a full-bin-surface compaction quality rapid evaluation model which uses the random forest solving method is established, and is visually expressed through a compaction quality distribution cloud picture, and thus, a rolling compaction concrete dam compaction quality rapid evaluation result has comprehensiveness and practicability.

The invention discloses a roller compacted concrete dam structural condition monitoring system and monitoring method. The system comprises a structural condition monitoring apparatus and a bending adjustment apparatus, and the structural condition monitoring apparatus is connected with the bending adjustment apparatus through a temperature sensing fiber. Based on temperature information obtained by the temperature sensing fiber, differences between a roller compacted concrete dam body and bedding plane thermal parameters are taken into consideration, calculation analysis is carried out based on equivalent analysis of such thermal parameters as a roller compacted concrete online expansion coefficient, specific heat and the like by use of a finite element temperature strain increment calculation form, at the same time, linear strain and tangent strain which are caused to a bedding plane and the body of a roller compacted concrete dam due to the differences of the thermal parameters are also taken into consideration, the structural condition of the roller compacted concrete dam is analyzed and evaluated, based on distributed monitoring of the temperature sensing fiber, the monitoring capability is greatly improved, the demand for actual structural condition diagnosis of the roller compacted concrete dam is well satisfied, and an important guarantee is provided for current roller compacted concrete dam structural condition health monitoring study.

The invention relates to the technical field of road engineering construction, and particularly to a road building method which solves the problems that an existing road engineering construction road structure is relatively single, easy to damage, difficult in repairing, and high in building cost. The building method comprises the steps of mixing at least biological enzyme, broken stones, soil, an additive and water according to a certain ratio and rolling to form a biological enzyme soil solidified base layer and a subbase layer (enzyme soil solidified base layer for short), and then paving a cement mixing material of the biological enzyme, rubber powder and fibers modified for multiple times on the enzyme soil solidified base layer through a paving machine, rolling and forming to obtain a novel road pavement structure based on the enzyme soil solidified base layer and a multi-element repeated-modified roller compacted concrete pavement. By adopting the road building method of the novel road pavement structure, the difficulties such as high requirement on materials selected by building a road pavement, high cost, complicated construction, difficulty in maintenance, serious environment pollution and the like are solved, and the use performance of a road is greatly improved; the novel road pavement structure has the advantages of environment friendliness without pollution, resource saving, and the like, and is remarkable in economical benefits and social benefits.

The invention discloses a nondestructive measurement method for water content of roller-compacted concrete. According to the method, dielectric constants of an upper surface layer and a lower surface layer of the roller-compacted concrete are acquired according to electromagnetic reflection strength, and the water content is calculated on the basis of the dielectric constants. Compared with the prior art, the nondestructive measurement method has the advantages as follows: (1), surface reflection strength of the upper layer and the lower layer of the roller-compacted concrete is measured with a ground penetrating radar technology, the dielectric constants of the upper layer and the lower layer of the concrete are calibrated by means of the reflection strength, and the water content of the upper layer and the lower layer of the concrete is predicated according to the dielectric constants, and the method has the characteristics of rapidness and accuracy and can realize overall control on construction quality of the roller-compacted concrete to the greatest extent; (2), the measurement method has the advantages of high working efficiency, high resolution ratio, nondestructive performance and the like.