A method for precisely controlling the construction quality of a roller compacted concrete layer

Abstract

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.

Description

Technical Field

[0001] This invention belongs to the field of water conservancy and hydropower engineering, and specifically relates to a method for accurately controlling the construction quality of roller-compacted concrete layers. Background Technology

[0002] In water conservancy and hydropower projects, the quality control of interlayer bonding during the pouring of roller-compacted concrete (RCC) gravity dams is a key focus of the entire dam construction. Generally, interlayer quality control requires that "the upper layer of RCC can be continuously laid before the lower layer of RCC has initially set," which can be achieved by controlling the "allowable direct laying time." In special cases, if the lower layer of RCC has initially set but not yet fully set, mortar or cement paste must be laid between layers before the upper layer of concrete can be poured. If the lower layer of RCC has fully set, the surface must be treated as a construction joint. This involves roughening or rinsing the surface, curing, acceptance, laying a base layer of mixture (mortar, cement paste), and then continuing the pouring of the upper layer of RCC. Furthermore, during the pouring process, the VC value (workability of the RCC mixture) of the RCC must be measured every 2 hours on the surface to control the quality of the RCC.

[0003] The following problems are encountered when using the current construction control methods: (1) The quality of interlayer joint pouring cannot be tracked in real time. (2) The interlayer joints are not quantitatively identified, and the interlayer treatment is only considered based on the initial and final setting times, resulting in low interlayer quality control. (3) The roller-compacted concrete mix proportion is determined by experiments, and the initial and final setting times of the roller-compacted concrete are easily affected by the external environment (including temperature, sunshine, humidity, wind speed, etc.), resulting in changes in the initial and final setting times. Using the fixed time determined by experiments to control the interlayer quality is unreliable. (4) When encountering emergencies during the pouring process, such as equipment failure or sudden temperature changes, the strength index of the lower surface concrete cannot be reliably grasped, resulting in poor interlayer quality control and inability to take timely countermeasures. (5) my country has large regional differences and diverse climates, resulting in large differences in the control range of VC value, requiring dynamic control of VC value. VC value control is easily affected by human factors, resulting in large deviations in the quality of roller-compacted concrete. Summary of the Invention

[0004] The purpose of this invention is to provide a method for precisely controlling the interlayer construction quality of roller-compacted concrete (RCC). This invention classifies and identifies interlayer joints in RCC, applies dual indicators of concrete maturity and exposure time to dynamically manage the interlayer quality, and proposes different treatment measures for different interlayer joints. This allows for the quantification of interlayer joint quality and real-time monitoring of the joint bonding strength, thereby improving the overall pouring quality of RCC.

[0005] A method for precisely controlling the interlayer construction quality of roller-compacted concrete includes the following steps:

[0006] S1, Preparation for roller-compacted concrete test: Determine the test site and size of roller-compacted concrete test blocks, and divide the test blocks into areas;

[0007] S2, the rolling test process, involves rolling the test block in layers to obtain the maturity results of the interlayer joint test of the test block;

[0008] S3, Curing and core sampling of roller-compacted concrete test blocks to obtain test data of the core samples;

[0009] S4. Analyze the tensile and compressive strength results of the core sample to obtain the analytical conclusions of the tensile and compressive strength results of the sample;

[0010] S5, based on S2 to S4, formulate control standards and treatment measures for interlayer joints in roller-compacted concrete for different months;

[0011] S6. During the construction of roller-compacted concrete dams, corresponding treatment measures shall be taken according to the control standards and treatment measures for interlayer joints of roller-compacted concrete in different months.

[0012] S7, The construction of the roller-compacted concrete dam is completed, and the construction quality is inspected and the results are verified.

[0013] Preferably, in step S2, the layered compaction experiment includes:

[0014] S201, a comparative test of different time intervals and different treatment methods was conducted on the interlayer joints of roller-compacted concrete in different zones;

[0015] S202, a comparative test of different treatment methods for interlayer joints of roller-compacted concrete in different zones.

[0016] Preferably, in step S3, the specific steps for obtaining the test results data of the core sample are as follows: the roller-compacted concrete test block is cured, and after reaching the design age, holes are drilled at different parts of the test block to obtain core samples, and the core samples are numbered, and the broken core samples are further identified and marked. The core samples are processed in the laboratory and tensile and compressive tests are conducted respectively to obtain the test results data of the core samples.

[0017] Preferably, in step S5, the specific steps for formulating control standards and treatment measures for interlayer joints in roller-compacted concrete for different months include:

[0018] S501, determine the exposure time of "hot joints", "warm joints" and "cold joints" of roller-compacted concrete in the experimental month;

[0019] S502, through S501 and S2, determines the maturity of "hot joint", "warm joint" and "cold joint" of roller-compacted concrete in the experimental month;

[0020] S503, determine the exposure time and maturity of "hot joints", "warm joints" and "cold joints" in roller-compacted concrete during non-experimental months;

[0021] S504 establishes standards for the treatment of "hot joints", "warm joints" and "cold joints";

[0022] S505, based on S501 to S504, establishes control standards and treatment measures for interlayer joints in roller-compacted concrete for different months.

[0023] Preferably, in S501, the exposure time of the "hot joint", "warm joint" and "cold joint" of the roller-compacted concrete in the experimental month is determined by the initial setting exposure time and the final setting exposure time.

[0024] Preferably, the initial setting exposure time and the final setting exposure time are determined based on the test results data of the core sample in S3 and the analysis conclusions of the tensile and compressive strength results of the sample in S4.

[0025] Preferably, in step S503, the exposure time of "hot joints," "warm joints," and "cold joints" in roller-compacted concrete during non-experimental months is calculated based on the exposure time during the experimental months, using the following formula:

[0026] T i =T 试验 ×a i

[0027] Wherein: T i T represents the interlaminar seam exposure time in the i-th month; 试验 The interlaminar seam exposure time corresponding to the experimental month; a i is the conversion factor corresponding to the average temperature of the i-th month.

[0028] Preferably, in S503, the maturity of the "hot joints," "warm joints," and "cold joints" of the roller-compacted concrete in non-experimental months is calculated based on the maturity of the experimental months, using the following formula:

[0029] F i =F 试验 ×a i

[0030] Wherein: F i F represents the interlaminar fracture maturity in the i-th month; 试验 The maturity of interlayer joints in roller-compacted concrete during the experimental month; a i Let be the conversion coefficient corresponding to the average temperature of the i-th month.

[0031] Preferably, the treatment measures for "hot seam", "warm seam" and "cold seam" in S504 are determined based on the test results data of the core sample in S3 and the analysis conclusions of the tensile and compressive strength results of the sample in S4.

[0032] Preferably, in step S6, the specific steps for implementing corresponding treatment measures based on the control standards and treatment measures for interlayer joints in roller-compacted concrete during the construction of the roller-compacted concrete dam include:

[0033] S601, records the pouring information for this warehouse number;

[0034] S602, Fill out the interlayer quality monitoring form during roller-compacted concrete construction;

[0035] S603: After each layer is poured, fill in the interlayer pouring quality conclusion. Based on the pouring month, and in accordance with the control standards and treatment measures for interlayer joints of roller-compacted concrete in different months in S6, determine the type and treatment method of the interlayer joint.

[0036] The beneficial effects of this invention are as follows:

[0037] 1. Real-time tracking of the early strength of each layer of concrete using maturity and exposure time indicators to achieve standardized quality control.

[0038] 2. Classifying and judging interlayer joints is beneficial for taking timely countermeasures and providing quality control of interlayer bonding.

[0039] 3. Dynamically track the surface layer of the lower layer of compacted concrete to digitize the quality control data of the exposed surface layer and the interlayer concrete that has not been compacted in time.

[0040] 4. Considering the impact of temperature in different seasons and months on interlayer joints and roller-compacted concrete, monthly interlayer joint pouring control standards should be formulated to improve the ability to refine the quality control of concrete interlayer joints.

[0041] 5. In the event of construction interruption, interlayer joints at different downtimes can be promptly identified and corresponding measures can be taken immediately, which helps to improve the quality control of interlayer joints.

[0042] 6. Reduce on-site roller-compacted concrete testing to improve construction efficiency and quality.

[0043] 7. Based on the monthly interlayer control requirements, the hourly laying strength of each layer of concrete can be accurately estimated, which helps to rationally divide the work area, arrange machinery and manpower, thereby improving the continuity of roller-compacted concrete pouring and ensuring interlayer quality.

[0044] 8. It is beneficial for the quality control of interlayer joints in high dams, especially roller-compacted concrete dams with long dam axes and large volumes. Classifying and judging interlayer joints is helpful for taking timely countermeasures and providing quality control of interlayer bonding. Attached Figure Description

[0045] Figure 1 This is a flowchart of the present invention.

[0046] Figure 2 This is a three-dimensional rendering of the roller-compacted concrete test block of the present invention.

[0047] Figure 3 These are photographs of three core samples from the interlayer cement slurry treatment zone of this invention.

[0048] In the diagram: 1. Foundation; 2. Height boundary of the test block; 3. Downstream modified concrete interlayer joint; 4. Downstream modified concrete zone (Zone I); 5. Interlayer mortar treated zone (Zone II); 6. Untreated interlayer zone (Zone III); 7. Interlayer cement slurry treated zone (Zone IV); 8. Upstream modified concrete zone (Zone V); 9. Length boundary of the test block; 10. Structural joint of the test block; 11. Water stop at the joint; 12. Direction of water flow; 13. Downstream zoning line; 14. Interlayer comparison zoning line; 15. Mortar-treated interlayer joint; 16. Width boundary of the test block; 17. Cement slurry treated interlayer joint; 18. Upstream zoning line; 19. Upstream modified concrete interlayer joint. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0050] This invention includes the entire construction management process, from preliminary testing of roller-compacted concrete, to control during construction, and quality inspection upon completion. Figure 1 As shown, a method for accurately controlling the interlayer construction quality of roller-compacted concrete is disclosed, comprising the following steps:

[0051] S1, Preparation for roller-compacted concrete test: Determine the test site and the size of the roller-compacted concrete test block, and divide the test block into areas.

[0052] like Figure 2As shown, for the roller-compacted concrete test, a suitable test site foundation 1 was determined. The roller-compacted concrete specimen size can be 40m × 15m × 2.4m, where the length of the specimen height edge 2 is 2.4m, the length of the specimen length edge 9 is 40m, and the length of the specimen width edge 16 is 15m. The water flow direction 12 is perpendicular to the specimen length edge 9. Along the water flow direction 12 from upstream to downstream, the specimen is divided into three zones: upstream modified concrete zone - zone V 8, roller-compacted concrete zone (including interlayer mortar treatment zone - zone II 5, interlayer untreated zone - zone III 6, and interlayer cement slurry treatment zone - zone IV 7), and downstream modified concrete zone - zone I 4. The test block is divided into left and right parts by a structural joint 10 in the middle of the length edge line. A joint water stop 11 is set upstream of the structural joint 10. The left part is divided into 3 blocks along the width edge line 16 of the test block by the upstream partition line 18 and the downstream partition line 13 (from upstream to downstream, they are the upstream abnormal concrete zone - zone V 8, the interlayer untreated zone - zone III 6, and the downstream abnormal concrete zone - zone I 4). The right part is divided into 4 blocks along the width edge line 16 of the test block by the upstream partition line 18, the interlayer comparison partition line 14 and the downstream partition line 13 (from upstream to downstream, they are the upstream abnormal concrete zone - zone V 8, the interlayer cement slurry treated zone - zone IV 7, the interlayer mortar treated zone - zone II 5, and the downstream abnormal concrete zone - zone I 4). The interlayer joints of each layer in the upstream modified concrete zone - Zone V 8 are the upstream modified concrete interlayer joints 19; the interlayer joints of each layer in the mortar treatment zone - Zone II 5 are the mortar treatment interlayer joints 15; the interlayer joints of each layer in the interlayer cement slurry treatment zone - Zone IV 7 are the cement slurry treatment interlayer joints 17; and the interlayer joints of each layer in the downstream modified concrete zone - Zone I 4 are the downstream modified concrete interlayer joints 3.

[0053] The compressive strength of the roller-compacted concrete test blocks meets the design strength requirements of the dam, and the initial and final setting times of the roller-compacted concrete are adjusted according to the construction strength requirements. (This patent uses a cylindrical roller-compacted concrete test block with a design compressive strength of 12 MPa, a design tensile strength of 1.15 MPa, an initial setting time of 21 ± 3 hours, a final setting time of 53 ± 3 hours, and a design age of 90 days as an example.)

[0054] S2, the rolling test process, involves rolling the test block in layers to obtain the maturity results of the interlayer test of the test block.

[0055] After dividing the test blocks into 5 zones (including downstream modified concrete zone I, interlayer mortar treated zone II, untreated interlayer zone III, interlayer cement slurry treated zone IV, and upstream modified concrete zone V), the test blocks were compacted in layers with an interlayer thickness of 30 cm, for a total of 8 layers. The following tests were then conducted:

[0056] S201, a comparative test was conducted on the interlayer joints of roller-compacted concrete in different zones, using different time intervals and different treatment methods.

[0057] Comparative tests were conducted on roller-compacted concrete in different zones using different time intervals and treatment methods. The time intervals should be 4h, 10h, 16h, 22h, 36h, 48h, and 60h.

[0058] S202, a comparative test of different treatment methods for interlayer joints of roller-compacted concrete in different zones.

[0059] (1) Different treatment methods were tested on the interlayer joints of the roller-compacted concrete in zones II to IV of the first to fifth layers, including comparative tests of interlayer joints treated with mortar in zone II, no interlayer joints in zone III, and interlayer joints treated with cement grout in zone IV. Zones I and V were tested without interlayer joint treatment.

[0060] (2) The following experiments were conducted on the interlayer joints (a total of 3 interlayer joints) at the bottom of the 6th to 8th layers of roller-compacted concrete: interlayer roughening and non-roughening in Zone III; interlayer roughening with cement slurry treatment and non-roughening with cement slurry treatment in Zone IV; interlayer roughening with mortar treatment and non-roughening with mortar treatment in Zone II; and comparative tests of roughening and non-roughening were conducted in Zones I and V.

[0061] To meet the above experimental requirements, the interlayer exposure time and air temperature need to be recorded during the casting experiment, and the corresponding maturity needs to be calculated to obtain the maturity results of the test block (see Table 1). The corrected maturity is calculated by multiplying the corrected interlayer air temperature by the interlayer joint exposure time, where the corrected interlayer air temperature is the sum of the average interlayer joint exposure air temperature and the value 15.

[0062] Table 1 Results of Roller-Compacted Concrete Specimens

[0063]

[0064] S3 involves curing and core sampling of the roller-compacted concrete test blocks to obtain test data from the core samples.

[0065] After the roller-compacted concrete test blocks have reached the design age, core samples are taken from different locations on the test blocks. The specific steps are as follows:

[0066] Three sets of core samples (a total of 15 sets) were drilled in five areas of the test block. Seven columnar specimens (192 mm in diameter and 385 mm in length) were processed from each set of core samples. Each test block spanned approximately 7 interlayer joints and could represent 7 interlayer joints in the 8 layers of roller-compacted concrete of the test block.

[0067] The core samples were numbered, and fractured core samples were further identified and marked. The core samples were then processed in the laboratory and subjected to tensile and compressive strength tests. The test results data were obtained and compiled into a core sample test results table (see Table 2). Table 2 below shows the test results of the drilled samples from the interlayer cement slurry treatment zone (Zone IV).

[0068] Table 2 Core Sample Test Results

[0069]

[0070] As shown in Table 2, the three core samples in the interlayer cement slurry treatment zone (zone IV) are numbered K1, K2, and K3, respectively. The appearance of the interlayer joint of the core samples is divided into intact and torn. The integrity rate of the core samples is the number of intact core samples / 3. The tensile and compressive strengths of each core sample are the measured values ​​of the test. The average compressive strength of the core sample is the average of the compressive strengths of the three core samples, and the average tensile strength of the core sample is the average of the tensile strengths of the three core samples.

[0071] The fractures in the core samples should be classified and labeled, with a total of 4 types of fractures. This indicates a breakage during transport; This indicates a weak interlayer fracture; This indicates a borehole fracture due to tilting. This indicates that the core sample broke due to drill bit wobbling or speed changes.

[0072] like Figure 3 As shown, the appearance of the interlayer seams in the three core samples was determined by examining the core sample photographs. Figure 3 As shown, the three core samples exhibited two types of fracture: fracture during transport and fracture due to interlayer weakness.

[0073] S4. Analyze the tensile and compressive strength results of the core sample to obtain the analytical conclusions on the tensile and compressive strength results of the sample.

[0074] Analysis of the tensile and compressive strength results of 105 specimens prepared from 15 sets of core samples yielded the following conclusions:

[0075] The compressive strength of the specimens all met the design strength (12 MPa for cylinders). The compressive and tensile strengths of the specimens decreased as the interlaminar exposure time increased.

[0076] The results of the tests conducted on the four interlayer joints in the roller-compacted concrete zone (layers 1-5) after exposure for 4 hours, 10 hours, 16 hours, and 22 hours are as follows:

[0077] 2.1 The shorter the exposure time of the interlayer gap, the greater the tensile strength of the specimen.

[0078] 2.2 The tensile strength of different interlayer treatment methods is as follows: cement grout treatment ≥ mortar treatment > no interlayer treatment.

[0079] The conclusions of the tests conducted on three interlayer joints in the 6th to 8th layers of roller-compacted concrete zone after exposure for 36 hours, 48 ​​hours, and 60 hours are as follows:

[0080] 3.1 When the specimen is exposed for less than 36.5 hours, its tensile strength meets the design strength requirement (1.15 MPa).

[0081] 3.2 When the interlayer treatment methods are different, only one variable is compared during the comparison: roughening and no roughening. The tensile strength of the sample is: roughened ≥ no roughening. When the sample is not roughened, the tensile strength of the sample is compared with three cases: cement grout treatment, mortar treatment and no treatment. The tensile strength of the sample is: cement grout treatment ≈ mortar treatment > no interlayer treatment.

[0082] The conclusion for the modified concrete zone is as follows:

[0083] 4.1 When the exposure time of the interlayer seam is different, the tensile strength of the specimens is: 4hrs≥10hrs>16hrs>22hrs. The tensile strength of the specimens exposed for 36h, 48h and 60h is basically the same.

[0084] 4.2 Tensile strength of specimens with different interlayer treatments: roughened ≥ unroughened.

[0085] S5. Establish control standards and treatment measures for interlayer joints in roller-compacted concrete for different months.

[0086] S501, determine the exposure time of "hot joints", "warm joints" and "cold joints" of roller-compacted concrete in the experimental month.

[0087] To accurately determine and quantify the quality of interlayer joints, this invention classifies roller-compacted concrete (RCC) interlayer joints into "hot joints," "warm joints," and "cold joints" based on the initial and final setting times of the RCC, thus establishing control principles for RCC interlayer joints. A "hot joint" indicates that the underlying concrete has been exposed for a relatively short time and has not yet set; its corrected maturity is low, and no treatment of the interlayer joint is necessary, allowing for continuous pouring. A "warm joint" indicates that the underlying concrete has been exposed for a slightly longer time and has already set but not yet fully set; its corrected maturity is high. A "cold joint" indicates that the underlying concrete has been exposed for too long and has already fully set, making pouring impossible.

[0088] The exposure time of "hot joints," "warm joints," and "cold joints" in roller-compacted concrete during the experimental month was determined by the initial setting exposure time and the final setting exposure time. The critical judgment time for "hot joints" and "warm joints" was the initial setting exposure time, and the critical judgment time for "warm joints" and "cold joints" was the final setting exposure time.

[0089] The initial and final setting exposure times of roller-compacted concrete were determined based on the test data of the core sample in S3 and the analysis conclusions of the tensile and compressive strength results of the sample in S4.

[0090] The initial setting time was initially determined to be 21 ± 3 hours. Based on the sampling analysis of the samples in Table 2, the integrity of the samples deteriorated due to interlayer weakness and fracture after the exposure time between roller-compacted concrete layers exceeded 22.1 hours. The experimental analysis concluded that the tensile strength test met the requirements within 36.5 hours of exposure. In summary, the initial setting time for all zones of the test blocks in the month of the experiment (August) was determined to be 22 hours (rounded down). Therefore, the critical judgment time for "hot joint" and "warm joint" is 22 hours.

[0091] The initial set time was determined to be 53 ± 3 hours. As shown in Table 2, the interlaminar joints were exposed for less than 36.5 hours, and both the tensile and compressive strengths of the specimens met the requirements. Therefore, the final set time for all zones of the test block in the experimental month was set at 36 hours (rounded down). Thus, the critical time for distinguishing between "warm joints" and "cold joints" was 36 hours.

[0092] Therefore, the exposure time of "hot seams" should be controlled within 22 hours, the exposure time of "warm seams" should be controlled within 36 hours, and the exposure time of "cold seams" should exceed 36 hours.

[0093] S502, through S501 and S2, determines the maturity of "hot joints", "warm joints" and "cold joints" of roller-compacted concrete in the experimental month.

[0094] The maturity of the "hot joint", "warm joint" and "cold joint" of the roller-compacted concrete in the experimental month was determined based on the exposure time of the "hot joint", "warm joint" and "cold joint" in S501 and the maturity results of the test block test in S2.

[0095] For "hot joints," the interlayer joint exposure time was controlled at 22 hours during the August experiment. Referring to Table 1, the maturity of the interlayer joint can be controlled at 824 h·℃ (rounded down). For "warm joints," the interlayer joint exposure time was controlled at 36 hours in August. Referring to Table 1, the maturity of the interlayer joint is 1438 h·℃ (rounded down). Conservatively taking 80% of this, we get 1150 h·℃. For "cold joints," the interlayer joint exposure time in August exceeded 36 hours, and the corresponding maturity is greater than or equal to 1150 h·℃.

[0096] S503 determines the exposure time and maturity of "hot joints", "warm joints", and "cold joints" in roller-compacted concrete during non-experimental months.

[0097] The exposure time and maturity of "hot joints", "warm joints" and "cold joints" in roller-compacted concrete during non-experimental months were calculated using experimental months.

[0098] The average monthly temperature at the construction site over many years was statistically analyzed (see Table 3). Based on the conversion coefficient table of initial and final setting exposure time for roller-compacted concrete pouring in each month in Table 4, the exposure time and maturity of interlayer joint control during construction in non-experimental months were calculated.

[0099] The formula for calculating exposure time is:

[0100] T i =T 试验 ×a i

[0101] Wherein: T i T represents the interlaminar seam exposure time in the i-th month (excluding experimental months), in hours. 试验 The interlaminar seam exposure time corresponding to the experimental month, in hours; a i Let be the conversion coefficient corresponding to the average temperature of the i-th month.

[0102] The formula for calculating maturity is:

[0103] F i =F 试验 ×a i

[0104] Wherein: F i F represents the interlaminar fracture maturity in the i-th month (excluding the experimental month), expressed in h·℃. 试验 The maturity of the interlayer joints of roller-compacted concrete in the experimental month is expressed in h·℃; a i Let be the conversion coefficient corresponding to the average temperature of the i-th month.

[0105] Table 3. Average monthly temperature at the project location

[0106]

[0107] Table 4. Conversion coefficients for initial setting and final setting exposure times during roller-compacted concrete pouring in each month.

[0108]

[0109] S504 establishes standards for handling "hot joints", "warm joints", and "cold joints".

[0110] The treatment measures for "hot joint", "warm joint", and "cold joint" are determined based on the test results data of the core sample in S3 and the analysis conclusions of the tensile and compressive strength results of the sample in S4.

[0111] When the interlayer joint is a "hot joint", the roller-compacted concrete has not yet set and meets the requirements for continuous pouring. No treatment is needed between layers for continued pouring.

[0112] When the interlayer joint is a "warm joint," the roller-compacted concrete has already begun to set. According to the data in Table 2, the interlayer joint bonding is relatively poor. Based on the analysis of the tensile and compressive strength results of the samples, the "cement grout treatment" method is the most effective and fastest among the interlayer treatment methods. Therefore, cement grout treatment should be performed on the interlayer joint of the "warm joint" before proceeding with the construction of the next layer of concrete.

[0113] When the interlayer joint is a "cold joint," the roller-compacted concrete has already set. According to the data in Table 2, the tensile strength of the interlayer joint does not meet the requirements, and the joint is prone to breakage due to weak bonding. Therefore, construction needs to be interrupted, and the joint must be roughened and inspected before subsequent roller-compacted concrete construction can proceed.

[0114] S505, based on S501 to S504, establishes control standards and treatment measures for interlayer joints in roller-compacted concrete for different months.

[0115] Table 5 shows the control standards and treatment measures for interlayer joints in roller-compacted concrete for different months.

[0116] Table 5. Monthly Interlayer Joint Control Standards and Corresponding Treatment Measures

[0117]

[0118]

[0119] S6. During the construction of roller-compacted concrete dams, corresponding treatment measures are implemented according to the control standards and treatment measures for interlayer joints of roller-compacted concrete in different months.

[0120] Before constructing the roller-compacted concrete dam, a construction layer number information table, an inter-layer quality monitoring table, and an inter-layer pouring quality conclusion should be prepared. During dam construction, the specific steps for implementing corresponding treatment measures based on the roller-compacted concrete inter-layer joint control standards and treatment measures for different months include:

[0121] S601 records the pouring information for this warehouse number.

[0122] Fill in the construction section number information form (see Table 6.1) and record the pouring information for this section number.

[0123] Table 6.1 Construction Warehouse Number Information Table

[0124] Construction site #8 compacted blocks Station number DR31~DR3157.5

[0125] S602, Fill out the interlayer quality monitoring form during roller-compacted concrete construction.

[0126] During the roller-compacted concrete construction process, fill out the interlayer quality monitoring form (see Table 6.2). The pouring start time is the time when the roller-compacted concrete mixing is completed. Monitor and record information such as the surface temperature and interlayer maturity every hour to accurately monitor the interlayer quality.

[0127] Table 6.2 Interlayer Quality Monitoring Table

[0128]

[0129]

[0130] S603: After each layer is poured, fill in the interlayer pouring quality conclusion. Based on the pouring month, and in accordance with the control standards and treatment measures for interlayer joints of roller-compacted concrete in different months in S6, determine the type and treatment method of the interlayer joint.

[0131] After each layer is poured, fill in the interlayer pouring quality conclusion (see Table 6.3). Based on the pouring month, determine the interlayer joint maturity requirements and exposure time requirements of this section according to Table 5, and determine the interlayer joint type of this section and fill in the interlayer joint treatment method of this section.

[0132] Table 6.3 Conclusion on the quality of interlayer casting

[0133]

[0134] S7, The construction of the roller-compacted concrete dam is completed, and the construction quality is inspected and the results are verified.

[0135] After the roller-compacted concrete dam is poured and reaches the design age, core samples are taken from different dam sections to conduct relevant tests such as tensile and compressive strength tests. These tests are used to verify the rationality and effectiveness of the invention in controlling the quality of interlayer joints during dam construction.

Claims

1. A method for precisely controlling the interlayer construction quality of roller-compacted concrete, characterized in that, Includes the following steps: S1, Preparation for roller-compacted concrete test: Determine the test site and size of roller-compacted concrete test blocks, and divide the test blocks into areas; S2, the rolling test process, involves rolling the test block in layers to obtain the maturity results of the interlayer joint test of the test block; In S2, the layered compaction experiment includes: S201, a comparative test of different time intervals and different treatment methods was conducted on the interlayer joints of roller-compacted concrete in different zones; S202, a comparative test of different treatment methods for interlayer joints of roller-compacted concrete in different zones; S3, Curing and core sampling of roller-compacted concrete test blocks to obtain test data of the core samples; S4. Analyze the tensile and compressive strength results of the core sample to obtain the analytical conclusions of the tensile and compressive strength results of the sample; S5, based on S2 to S4, formulate control standards and treatment measures for interlayer joints in roller-compacted concrete for different months; In S5, the specific steps for formulating control standards and treatment measures for interlayer joints in roller-compacted concrete for different months include: S501, determine the exposure time of "hot joints", "warm joints" and "cold joints" of roller-compacted concrete in the experimental month; S502, through S501 and S2, determines the maturity of "hot joints", "warm joints" and "cold joints" of roller-compacted concrete in the experimental month; S503, determine the exposure time and maturity of "hot joints", "warm joints" and "cold joints" of roller-compacted concrete in non-experimental months; In S503, the exposure time of "hot joints," "warm joints," and "cold joints" of roller-compacted concrete in non-experimental months is calculated based on the exposure time in the experimental months, using the following formula: T i =T 试验 ×a i Wherein: T i T represents the interlaminar seam exposure time in the i-th month; 试验 The interlaminar seam exposure time corresponding to the experimental month; a i Let be the conversion factor corresponding to the average temperature of the i-th month; In S503, the maturity of "hot joints," "warm joints," and "cold joints" of roller-compacted concrete in non-experimental months is calculated based on the maturity of the experimental months, using the following formula: F i =F 试验 ×a i Wherein: F i F represents the interlaminar fracture maturity in the i-th month; 试验 The maturity of interlayer joints in roller-compacted concrete during the experimental month; a i Let be the conversion factor corresponding to the average temperature of the i-th month; S504 establishes standards for treatment measures of "hot joints", "warm joints", and "cold joints"; S505, based on S501 to S504, sets control standards and treatment measures for interlayer joints in roller-compacted concrete for different months; S6. During the construction of roller-compacted concrete dams, corresponding treatment measures shall be taken according to the control standards and treatment measures for interlayer joints of roller-compacted concrete in different months. S7, The construction of the roller-compacted concrete dam is completed, and the construction quality is inspected and the results are verified.

2. The method for precisely controlling the interlayer construction quality of roller-compacted concrete according to claim 1, characterized in that, In step S3, the specific steps for obtaining the test results data of the core sample are as follows: the roller-compacted concrete test block is cured, and after reaching the design age, holes are drilled at different parts of the test block to obtain core samples. The core samples are numbered, and broken core samples are further identified and marked. The core samples are processed in the laboratory and tensile and compressive tests are conducted respectively to obtain the test results data of the core sample.

3. The method for precisely controlling the interlayer construction quality of roller-compacted concrete according to claim 1, characterized in that, In S501, the exposure time of the "hot joint", "warm joint", and "cold joint" of the roller-compacted concrete in the experimental month is determined by the initial setting exposure time and the final setting exposure time.

4. The method for precisely controlling the interlayer construction quality of roller-compacted concrete according to claim 3, characterized in that, The initial setting exposure time and final setting exposure time are determined based on the test results data of the core sample in S3 and the analysis conclusions of the tensile and compressive strength results of the sample in S4.

5. The method for precisely controlling the interlayer construction quality of roller-compacted concrete according to claim 1, characterized in that, In S504, the treatment measures for "hot seam", "warm seam" and "cold seam" are determined based on the test results data of the core sample in S3 and the analysis conclusions of the tensile and compressive strength results of the sample in S4.

6. The method for precisely controlling the interlayer construction quality of roller-compacted concrete according to claim 1, characterized in that, In S6, the specific steps for implementing corresponding treatment measures based on the control standards and treatment measures for interlayer joints in roller-compacted concrete dam construction according to different months include: S601, records the pouring information for this warehouse number; S602, Fill out the interlayer quality monitoring form during roller-compacted concrete construction; S603: After each layer is poured, fill in the interlayer pouring quality conclusion. Based on the pouring month, and in accordance with the control standards and treatment measures for interlayer joints of roller-compacted concrete in different months in S6, determine the type and treatment method of the interlayer joint.

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