54 results about "Roller-compacted concrete" patented technology

The utility model relates to the technical field of dam body reinforcing and reinforcing structures, in particular to a roller compacted concrete dam body reinforcing and reinforcing structure which comprises a roller compacted concrete dam body, vertical reinforcing plates, clamping plates, transverse connecting mechanisms and adjusting mechanisms, the vertical reinforcing plates are fixed to the outer wall of the roller compacted concrete dam body at equal intervals, and the clamping plates are fixed to the outer wall of the roller compacted concrete dam body; the transverse connecting mechanisms are arranged between every two adjacent vertical reinforcing plates, every two adjacent clamping plates can be in butt joint rapidly through the arrangement of the transverse connecting mechanisms, and meanwhile the linkage gears can be in butt joint rapidly under the limiting effect of the toothed plates through the arrangement of the adjusting mechanisms. When the reinforcing and reinforcing structure is assembled, the transverse connecting rods can be driven to rotate quickly, then the telescopic rods are driven to be in threaded linkage in the screw holes, the distance between every two adjacent telescopic rods can be quickly adjusted, the clamping plates can be quickly tensioned and loosened, and then the whole reinforcing and reinforcing structure can be quickly disassembled and assembled.

The application discloses a concrete production method, comprising the following steps: step 1, determining the quantity of materials needed to be added to ordinary concrete according to the required compressive strength of the roller compacted concrete; step 2, sequentially adding the required materials into the ordinary concrete and performing roller compacting mixing in the concrete; step 3, adding an admixture into the concrete obtained in step 2 through a low-temperature high-pressure spraying mixing mode; and step 4, adding asphalt into the concrete obtained in step 3 and uniformly mixing to obtain the roller compacted concrete. Further, the materials comprise stone powder, fly ash and pozzolanic admixture. The application increases the hardness and compressive strength of the ordinary concrete through material adding and process treatment, so that the roller compacted concrete can be produced on site when the demand is small, and factory ordering is not needed, thereby saving the construction cost.

This invention discloses a method, system, and equipment for identifying the construction progress of roller-compacted concrete dam surfaces: It acquires multi-camera video of the roller-compacted concrete dam surface, performs time synchronization, camera calibration, coordinate unification, regional modeling, and rasterization, and preprocesses the surface video; it detects, identifies, segments, and tracks construction equipment targets and surface conditions, mapping machine trajectories and work footprints to the construction plane, thereby completing statistical analysis of coverage area, number of compaction passes, dwell time, compliance status, and abnormal events; it calculates construction progress and efficiency indicators, compares them with the plan, and outputs progress diagnosis results, early warning information, scheduling suggestions, and report interface data. This invention utilizes on-site monitoring video, improving robustness under complex lighting, occlusion, and dust conditions through multi-camera spatiotemporal registration and deduplication fusion, reducing manual inspection costs, and enhancing the objectivity, timeliness, and traceability of progress perception.

The application discloses a method for precisely controlling construction quality of a roller compacted concrete interlayer, which comprises the following steps: S1, roller compacted concrete test preparation, determining a test site and a roller compacted concrete test block size, and dividing areas of the test block; S2, a roller test process, layer-by-layer rolling of the test block, and obtaining maturity results of different interlayer joints of the test block; S3, curing and coring of the roller compacted concrete test block, and obtaining test result data of the core sample; S4, analyzing tensile and compressive results of the core sample, and obtaining analysis conclusions of the tensile and compressive results of the sample; S5, according to S2 to S4, formulating control standards and treatment measures of the roller compacted concrete interlayer joints in different months; S6, in a roller compacted concrete dam construction process, corresponding treatment measures are carried out according to the control standards and treatment measures of the roller compacted concrete interlayer joints in different months; and S7, after the roller compacted concrete dam construction is completed, construction quality is checked and results are verified. The application can improve pouring quality of the roller compacted concrete.

The invention discloses a roller compacted concrete composition adaptive to a high altitude environment and a preparation method thereof, and the roller compacted concrete composition comprises the following components in parts by mass: 60-100 parts of cement, 65-75 parts of fine aggregate, 100-120 parts of coarse aggregate, 10-20 parts of zeolite powder, 1-5 parts of dopamine hydrochloride, 5-15 parts of activated fiber, 0.2-0.4 part of aminated polystyrene microspheres, and 0.1-0.5 part of a carbodiimide cross-linking agent. And 1-2 parts of a water reducing agent. The problems of insufficient early strength, later shrinkage cracking and poor freezing resistance of concrete in a high-altitude environment are solved, a composite system of polydopamine modified zeolite and activated fibers optimizes pore distribution and a stress transfer path, the balance of early strength, crack resistance and durability is realized, and the early strength, crack resistance and durability of the concrete are improved. And a reliable concrete solution is provided for high-cold and high-altitude engineering.

This invention relates to a construction positioning device and method for a roller-compacted concrete dam transverse joint water-stopping system. The device includes a main frame, a positioning mechanism, and a roll-up mechanism. The main frame has panels on both its top and bottom surfaces. The positioning mechanism includes a guide sleeve, a positioning element, and fasteners. The fasteners are located on the outer wall of the guide sleeve and are used to clamp the positioning element. The roll-up mechanism includes a drum body, a rotating shaft, and a water-stopping element. The water-stopping element is located on the surface of the drum body to allow it to be embedded into a preset position as construction progresses. This device solves the problems of interference and material waste during the construction of multiple dam sections, enabling collaborative operation and green construction of the water-stopping system; it overcomes the drawbacks of traditional drainage hole construction techniques, achieving precise molding without pre-embedded pipes; and it solves the problems of chaotic on-site stacking of water-stopping materials and welding damage, ensuring the construction quality of the water-stopping system.

This invention discloses a crack-resistant roller-compacted concrete (RCC) structure. Several slow-release mechanisms are embedded between adjacent compacted layers within the RCC structure. These slow-release mechanisms are steel fibers with expanded clay aggregate connected to both ends. The invention also discloses a construction method for the crack-resistant RCC structure, comprising the following steps: 1. Fixing template A and then spreading the RCC; 2. Laying template B with the slow-release mechanisms and compacting it multiple times using a compaction machine; 3. Covering with mortar and then spreading the RCC; 4. Repeating steps 2 to 3 until the target thickness of the RCC structure is achieved. The RCC structure of this invention, by embedding slow-release mechanisms between adjacent compacted layers and connecting them with steel fibers, improves the bonding strength between the compacted layers. Combined with saturated expanded clay aggregate, it reduces drying shrinkage by slowly releasing moisture within the RCC, making it applicable to the field of RCC technology.

The invention relates to the technical field of construction of roller compacted concrete gravity dams in water conservancy and hydropower engineering, in particular to a construction method for continuous multi-dam-section rapid pouring of dam foundation cushion layer concrete of a roller compacted concrete dam. According to dam foundation cushion concrete, by means of measures of building a road in advance, directly replacing traditional bamboo plywood with asphalt cedarwood boards for formworks and the like, the situation that in the conventional pouring process, damage and pollution are caused to a dam section foundation surface due to the fact that an automobile enters a warehouse through adjacent dam sections, and then the foundation surface is cleaned repeatedly is reduced; compared with the tedious procedures of one-bin cleaning, one-bin checking and accepting, one-bin pouring and one-bin re-cleaning circulation in the prior art, the pouring efficiency of the low-slump distorted concrete of the dam foundation cushion layers of the adjacent dam sections is greatly improved, and the rapid and continuous pouring construction method is formed.

The utility model discloses a roller compacted concrete nucleon density instrument measuring hole forming device which comprises a drill rod (3) used for forming holes and an electric hammer (1), the power output end of the electric hammer is provided with a drill rod clamping system (4), the drill rod clamping system is connected with the drill rod through a quick release connector, the lower end of the drill rod is provided with an elliptic hammer head, and the elliptic hammer head is connected with the electric hammer. The electric hammer is further provided with an infrared distance meter used for automatically measuring the hole opening depth. According to the utility model, the drill rod can be driven by the electric hammer to rotate so as to realize the electric forming of the measuring hole on the roller compacted concrete, so that the hole opening efficiency is greatly improved, the depth of the measuring hole can be accurately controlled, the disturbance to the roller compacted concrete is small, and the compactness of the roller compacted concrete can be more truly detected.

The application discloses a metamorphic concrete and roller compacted concrete joint quality identification method, system and equipment based on a ground penetrating radar. One-dimensional original waveform data of a metamorphic concrete and roller compacted concrete joint position is obtained by using a ground penetrating radar. After data preprocessing, noise waveform data is obtained. The noise waveform data and the original waveform data are integrated into a data set after being uniformly labeled. The data set is divided into a training set, a validation set and a test set. Based on the training set and the validation set, a DNFN model is used to construct and train a concrete joint quality identification model. The trained concrete joint quality identification model is used to infer and predict the data in the test set to determine whether the metamorphic concrete and roller compacted concrete joint position quality is qualified or unqualified. The application can quickly, accurately and non-destructively identify whether the joint position quality is qualified or unqualified, thereby providing reliable technical support for engineering quality control.

The utility model discloses a dump truck discharging aggregate separation prevention device for roller compacted concrete construction, and belongs to the technical field of concrete construction. The utility model relates to a dump truck unloading aggregate separation prevention device for roller compacted concrete construction. The dump truck unloading aggregate separation prevention device comprises a material guide assembly which is assembled at the tail part of a carriage and is used for reducing the unloading height difference. According to the aggregate separation prevention device, aggregate separation is effectively prevented, by additionally arranging the aggregate separation prevention device, the discharging height difference is reduced, the aggregate separation phenomenon of the three-graded roller compacted concrete is remarkably reduced, and the uniformity of the concrete is improved; the influence of aggregate separation on the compactness and strength of the roller compacted concrete is avoided, and the engineering quality is ensured; the device is simple in structure and convenient to operate, and extra manual intervention is not needed; and the method is suitable for various hydraulic and hydro-power engineering roller compacted concrete construction scenes, and has wide popularization and application values.

The invention discloses automatic spraying equipment for roller compacted concrete dam interlayer treatment materials, and relates to the technical field of roller compacted concrete dam construction, the automatic spraying equipment comprises a slurry storage tank, a sprayer arranged at one end, a fixing frame and a containing cylinder arranged on the slurry storage tank, the top of the containing cylinder is connected with the slurry storage tank, and a cavity is formed in the fixing frame; a first connecting pipe and a second connecting pipe are arranged in the cavity, the first connecting pipe and the second connecting pipe are attached to the inner wall of the cavity, and one end of the first connecting pipe and one end of the second connecting pipe are connected with the containing cylinder; according to the device, when cement paste is conveyed to the containing cylinder, the segregation condition is detected through a microwave moisture meter probe, if indexes are met, the switching assembly closes one connecting pipe and opens the other connecting pipe, the cement paste directly enters the sprayer, if segregation is serious, the other connecting pipe is switched, the pressing roller is started to peripherally extrude the pipe, the water flow speed is reduced, and the cement paste is separated. And the separated particles and water converge and permeate in the pipe and then are discharged into the sprayer to be sprayed out.

This invention discloses a roller-compacted concrete conveying system, including an upper unloading platform, a lower receiving platform, and a pipeline. The pipeline is located between the upper unloading platform and the lower receiving platform. A storage hopper is provided on the upper unloading platform. The upper end of the pipeline is connected to the storage hopper via an upper valve, and the lower end of the pipeline is provided with a lower valve. A material level detection mechanism is provided on the storage hopper. The roller-compacted concrete conveying system also includes a concrete transport vehicle, a silo transfer vehicle, a control center, and a material detection mechanism for detecting the material quantity in the concrete transport vehicle. The material level detection mechanism, the upper valve, the lower valve, the concrete transport vehicle, the silo transfer vehicle, and the material detection mechanism are all connected to the control center. A roller-compacted concrete conveying method is also disclosed, using the roller-compacted concrete conveying system. This roller-compacted concrete conveying system and method can ensure good concrete quality, good coordination, high automation, and high overall efficiency.

The utility model provides a fog gun machine installation platform based on a dam body slope. The fog gun machine installation platform comprises a slope steel formwork, an installation platform body and platform supporting legs. The slope steel formwork is used for forming the slope of the roller compacted concrete dam, in the supporting state, a supporting part is arranged at the highest point of a formwork support of the slope steel formwork, and two hinge parts are arranged at the point, closest to the bin face of the roller compacted concrete dam, of the formwork support of the slope steel formwork. The two platform supporting legs are located on the same side of the mounting platform, and the bottom ends of the two platform supporting legs are hinged to the hinge part; the main body part of the mounting platform can rotate around the hinge part, and when the mounting platform rotates to a horizontal state, the lower end face of the main body part of the mounting platform is supported on the supporting part. The installation platform has the advantages that the slope steel formwork is used as a support, and the operation space of the dam body bin face is not occupied.

The application discloses a kind of multifunctional splicing structure suitable for white plus black pavement reconstruction and expansion, and relates to the technical field of road engineering, including pull rod, balance beam, high water permeable concrete belt, old road pavement structure includes from top to bottom set asphalt overlay, old cement board, old road water stable base layer and old road graded gravel cushion layer, expansion pavement structure includes from top to bottom set expansion asphalt surface layer, roller compacted concrete slab, water stable lower base layer, water stable bottom base layer and expansion road graded gravel cushion layer, asphalt overlay is connected with expansion asphalt surface layer, old cement board is connected with roller compacted concrete slab, one end of pull rod is located in old cement board, the other end of pull rod is located in roller compacted concrete slab, balance beam is located below old cement board and roller compacted concrete slab, high water permeable concrete belt is located below balance beam.The application solves the quality defects such as cracking, deformation, internal water damage and the like at the splicing place of new and old pavement.

This invention discloses a method, system, and device for resource identification of roller-compacted concrete dam surfaces based on YOLOv10: The method involves acquiring a real-time video stream of the roller-compacted concrete dam surface; standardizing and enhancing each frame after frame decomposition to obtain enhanced surface images; defining resource target identification categories for the roller-compacted concrete dam surface, refining the surface images to obtain labeled images, and constructing a dedicated dataset for roller-compacted concrete dam surface resources; building and training a deeply optimized roller-compacted concrete dam surface resource identification model using the YOLOv10 model; using this model to infer the real-time video stream of the roller-compacted concrete dam surface, and post-processing the inference results using a spatiotemporally correlated target tracking algorithm to obtain structured resource information. This invention, through deep optimization of the YOLOv10 framework, specifically addresses the challenges of resource identification under multi-scale, dense occlusion, and strong background interference in RCCD surface scenarios, thereby achieving automated, accurate, and real-time monitoring of all construction elements.

The invention discloses a roller compacted concrete slurry adding modification construction homogeneity cooperative control device, which comprises a slurry metering module for calculating the output quantity of modified slurry according to a pouring rate, aggregate grading data and a slurry water-cement ratio; the compaction degree calculation module is used for calculating the compaction degree of the concrete according to the exciting force, the rolling depth and the rolling times; the detection module is used for generating a compactness distribution three-dimensional map; the control module is used for comparing the output quantity of the modified slurry with the output quantity of a preset adjustment instruction and generating a first correction strategy according to a comparison result; the compaction degree of the concrete is compared with a preset compaction degree threshold value, and a second correction strategy is generated according to a comparison result; and determining a to-be-adjusted area according to the compactness distribution three-dimensional map, generating an adjustment instruction of the to-be-adjusted area, and sending the adjustment instruction to the slurry metering module and the compactness calculation module. Accurate slurry metering control and compactness control are achieved, and timeliness and accuracy of construction adjustment are improved based on precise compactness detection.

The utility model discloses a test device for detecting the VC value of roller compacted concrete, and belongs to the technical field of concrete construction. Comprising a ring body and a pressing plate arranged in the ring body from top to bottom. A vibration motor is arranged on the pressing plate; the pressing plate is further provided with a plurality of balancing weights. According to the test device for detecting the VC value of the roller compacted concrete, the problem that the Veibog consistometer needs to be mounted at a fixed place is solved; a traditional test mode is subverted, and the device is adjusted to be in an upper vibration state, so that the whole device becomes a portable instrument.

The invention discloses a preparation method of roller compacted concrete with high crack resistance and high bone mass content, which comprises the following steps: carrying out manual sorting and magnetic separation iron removal on construction waste, then carrying out coarse crushing and fine crushing, and screening by a screen to obtain recycled coarse aggregate A with the particle size of 10-20mm; a recycled coarse aggregate B with a particle size of 5-10 mm; the particle size of the recycled fine aggregate is 0-5 mm; mixing the recycled coarse aggregate A, the recycled coarse aggregate B, the recycled fine aggregate, the household garbage incineration slag and the red mud aggregate, adding water, stirring to obtain a mixture A, adding cement, fly ash and mineral powder into the mixture, and stirring to obtain a mixture B; and adding polyolefin fibers, a water reducing agent and water into the mixture B, and stirring to complete the preparation of the roller compacted concrete. The 28-day compressive strength of the prepared concrete is larger than or equal to 35 MPa, the drying shrinkage rate is smaller than or equal to 0.025%, the crack area is smaller than or equal to 50 mm < 2 > / m < 2 >, freezing and thawing cycles are larger than or equal to 300 times, and meanwhile high-value utilization of the building solid waste and preparation of the high-performance concrete are achieved.

The invention discloses a roller compacted concrete dam interlayer combination construction method, which relates to the technical field of dam interlayer combination construction, and comprises the steps of interlayer joint maturity judgment, cold joint pretreatment, slurry adding treatment and roller compacted concrete paving. Dividing a hot seam, a warm seam and a cold seam by calculating the correction maturity (the integral of environment temperature and exposure time), wherein the hot seam is free from treatment, the warm seam is directly added with slurry, the cold seam is flushed by a high-pressure water gun (the pressure is greater than or equal to 15MPa, and the aggregate exposure rate is greater than or equal to 80%), and slurry is added after cleaning; 42.5 ordinary Portland cement is adopted for preparing cement paste with the water-binder ratio of 0.55-0.65, 8-12 kg / m of cement paste is sprayed, and paving (the uniformity error is smaller than or equal to + / -5%) and rolling (the number of times is larger than or equal to 8) of the next layer are completed within 3 hours; the method is standard in process, easy and convenient to operate, capable of remarkably improving interlayer bonding strength and dam impermeability and saving construction cost, suitable for roller compacted concrete gravity dams and particularly suitable for complex working conditions such as long-time construction joints and inclined warehousing roads.

The utility model provides a permafrost region runway foundation which comprises a foundation pit, a first rubble layer and a second rubble layer are arranged in the foundation pit in a replacement mode, the first rubble layer is located above the second rubble layer, a concrete layer is arranged between the first rubble layer and the second rubble layer, and a bidirectional geogrid is arranged in the first rubble layer. The utility model has the following beneficial effects: according to the foundation treatment measure of the permafrost region runway foundation replacement method, after the frost heaving and thaw collapse foundation soil is excavated, the non-frost heaving and thaw collapse block gravel material is backfilled, so that the problems of frost heaving and thaw collapse of the soil of the permafrost region runway foundation thaw collapse foundation can be solved; meanwhile, the deformation coordination measure of the double-layer geogrid and the roller compacted concrete layer is adopted, it is ensured that post-construction settlement and differential settlement of the runway can meet the safe use requirement, the adverse effect of underground water on frozen soil of a runway base is prevented with the assistance of the composite geomembrane anti-seepage measure and the foundation pit side wall transverse drainage blind ditch measure, and certain practical significance and popularization value are achieved.

The utility model discloses an assembly type protective barrier for edge protection of a roller compacted concrete dam bin face, which comprises poured roller compacted concrete and roller compacted concrete to be poured in a dam body of a dam, two sides of the roller compacted concrete to be poured are provided with turning and lifting steel formworks, the bottoms of the turning and lifting steel formworks are fixed with the dam body, and the bottom of the turning and lifting steel formworks is fixed with the dam body. The inner side of the turning and lifting formwork is fixed through diagonal draw bars, an assembly type protective fence is arranged above the turning and lifting steel formwork and arranged along roller compacted concrete to be poured, the turning and lifting steel formwork comprises fixing rods arranged on the two sides in parallel, the fixing rods on the inner side are provided with supporting steel plates making contact with the concrete, and the supporting steel plates are arranged on the fixing rods on the outer side of the turning and lifting steel formwork. A plurality of inclined reinforcing beams are arranged between the fixing rods on the two sides; according to the assembly type protective barrier for edge protection of the roller compacted concrete dam bin face, the high-altitude edge operation risk can be eliminated on the dam bin face, the overall structure is stable, assembly is convenient, manual vibration can be assisted through the protective barrier, the physical strength of workers can be saved, and the assembly type protective barrier is suitable for application and popularization.

The invention discloses an air entraining agent for roller compacted concrete and a preparation method of the air entraining agent. The air entraining agent is prepared by compounding an air entraining component A, an air stabilizing and enhancing component B and a sensitivity reducing component C according to the weight part ratio of (450-550): (250-350): (100-300). The air entraining component A is prepared through esterification and quaternization of modified rosin, the air stabilizing and enhancing component B is prepared by dispersing nano silicon dioxide and the like, and the sensitivity reducing component C is a multi-surfactant compound system. Through the synergistic effect of the three components, the problems that a conventional air entraining agent is poor in air entraining effect in roller compacted concrete, bubbles are prone to being damaged, and the air content is sensitive to the VC value are solved, the freezing resistance and impermeability of the concrete can be remarkably improved, the early and later compressive strength is guaranteed, and the air entraining agent is suitable for construction of water conservancy dam bodies in high-altitude severe cold areas and has good practicability and popularization value.

The invention discloses an anti-crack roller compacted concrete structure, a plurality of slow release mechanisms are embedded between adjacent rolling layers in the roller compacted concrete structure, and the slow release mechanisms are steel fibers with two ends connected with ceramsite; the invention further discloses a construction method of the anti-crack roller compacted concrete structure, and the construction method comprises the following steps that firstly, the formwork A is fixed, and then roller compacted concrete is paved; 2, a template B with a slow release mechanism is laid, and a rolling machine is adopted for multiple times of rolling; 3, covering mortar, and then paving roller compacted concrete; and fourthly, the process from the second step to the third step is repeated till the target thickness of the roller compacted concrete structure is achieved. According to the roller compacted concrete structure, the slow release mechanism is embedded between the adjacent roller compacted layers, so that the steel fibers are connected between the adjacent roller compacted layers, the binding force between the roller compacted layers is improved, water-saturated ceramsite is combined, moisture is slowly released in the roller compacted concrete, the drying shrinkage degree is reduced, and the roller compacted concrete structure is suitable for the technical field of roller compacted concrete.

This invention provides a rapid construction device and method for roller-compacted concrete (RCC) of dams during the dry season, comprising the following steps: S1, spreading RCC to a thickness of 50cm or more; S2, dividing the spread RCC into compaction strips; S3, compacting each compaction strip using two passes of static compaction, at least six passes of vibratory compaction, and two passes of static compaction, employing different compaction equipment for both static and vibratory compaction; these steps achieve rapid construction of RCC for dams. This invention provides a rapid construction device and method for RCC of dams during the dry season, improving construction efficiency while ensuring construction quality. Furthermore, by employing a non-reactive vibratory roller compaction scheme, the final vibratory compaction pass shortens the compaction time within the compaction chamber, reduces the number of passes, and further ensures the density of the RCC.

The utility model provides a fog gun machine mounting platform fixed on a roller compacted concrete dam straight surface template. The fog gun machine mounting platform comprises a cantilever turning and lifting steel template, platform supporting legs, platform vertical rods, platform tie bars and a platform panel, the cantilever turning and lifting steel formwork is a necessary steel formwork for roller compacted concrete dam construction, and a lug part is arranged at the top end of a back main beam truss of the cantilever turning and lifting steel formwork. Hinge holes are formed in the positions, corresponding to the lug parts, of the bottom ends of the platform supporting legs. The bottom ends of the platform supporting legs are installed on the cantilever overturning and lifting steel formwork in a hinged mode through the hinge holes and the lug parts. The platform vertical rods and the platform tie bars are spliced and welded to form a platform frame surrounding the tops of the platform supporting legs. The platform panel is installed at the lower end of the platform frame and used for placing the fog gun machine. The platform has the advantages that the fog gun mounting requirement of the roller compacted concrete dam can be met, and the space of a dam bin surface is not occupied.

The invention provides a composite modified air entraining agent, high-freezing-resistance roller compacted concrete suitable for a low-air-pressure and large-temperature-difference environment and a preparation method of the high-freezing-resistance roller compacted concrete, and belongs to the technical field of building materials. The concrete is prepared from 60 to 76 parts by mass of cement, 85 to 119 parts by mass of fly ash, 720 to 736 parts by mass of sand, 1420 to 1426 parts by mass of stone, 0.02 to 0.08 part by mass of a composite modified air entraining agent, 0.5 to 0.7 part by mass of a naphthalene-based superplasticizer and 80 to 96 parts by mass of water through a specific rolling process. A special composite modified air entraining agent is adopted, sodium abietate and triterpenoid saponin synergistically and efficiently entrain air, gelatin and hydroxypropyl methyl cellulose are innovatively introduced to form a composite foam stabilizing system, and the stability of bubbles under low air pressure and severe temperature difference is remarkably enhanced; and an optimized hole structure mainly comprising harmless holes and less-harmful holes is formed in the concrete.

The invention discloses a roller compacted concrete dam earthquake resistance evaluation method considering initial tensile strength and shear strength of a cutting type transverse joint, and belongs to the technical field of dam earthquake resistance. The method comprises the following steps: step 1, establishing a three-dimensional nonlinear refined finite element model comprising a roller compacted concrete dam body, a foundation and a reservoir water body; step 2, the initial tensile strength and the initial shear strength are incorporated into a contact unit constitutive relation of a finite element model; 3, sequentially applying a gravity load, a hydrostatic pressure load and a multi-dimensional seismic dynamic load in the finite element model; 4, performing three-dimensional nonlinear dynamic analysis by utilizing the finite element model; and 5, comprehensively evaluating the anti-seismic property of the roller compacted concrete dam. According to the method, the structural integrity, the energy dissipation capacity and the ultimate bearing capacity of the roller compacted concrete dam under a strong earthquake can be reflected more accurately, and the authenticity, the reliability and the engineering practical value of earthquake resistance evaluation are remarkably improved.

The invention discloses a roller compacted concrete interface damage identification method based on an acoustic emission technology, which comprises the following steps: (1) preparing a cubic block of roller compacted concrete with a standard size, dividing the cubic block into two layers, and arranging at least two acoustic emission probes on each of two opposite surfaces of the cubic block; (2) applying an acting force to the vertical square block, and receiving a sound wave signal by the sound emission probe; (3) receiving a sound wave signal through the sound emission probe to determine a concrete damage position; (4) the concrete cracking damage type is obtained through the RA-AF value of the acoustic emission probe, wherein RA is the comparison value of the rising time and the amplitude; aF is the ratio of the signal ringing count to the duration. According to the roller compacted concrete interface damage identification method based on the acoustic emission technology, the problem of inaccurate damage positioning in the prior art is effectively solved. The sound emission technology is combined with the damage identification algorithm, the damage position and category can be accurately identified, and a reliable basis is provided for subsequent repair.