A method and system for the evaluation of concrete workability

Abstract

The application discloses a kind of for the evaluation method and system of concrete work performance, comprising: based on slump test, the number and area of coarse aggregate particles in each region of concrete are obtained;Based on the number, expected number, area, expected area of coarse aggregate particles in each region, a homogeneity evaluation model is constructed, which is used to evaluate the workability of concrete;The evaluation method is applied to the evaluation system and evaluation device to realize the workability evaluation of concrete;The method for evaluating the workability of concrete provided by the application is accurate in guaranteeing the calculation result, and easy to operate, simple and easy to learn;It provides a technical reference for the workability evaluation of concrete.

Description

Technical Field

[0001] This invention relates to the field of building material performance evaluation technology, and more specifically, to a method and system for evaluating the workability of concrete. Background Technology

[0002] For cross-sea bridges built in marine salt-erosion environments, high-performance marine durable concrete is primarily used. The chloride ion diffusion coefficient is the main control indicator for concrete durability, achieved by incorporating a large proportion of mineral admixtures and using a low water-cement ratio to reduce the chloride ion diffusion coefficient. Conventional marine concrete typically uses conventional raw materials and processes, increasing its density by adding mineral admixtures and chemical additives, and is then applied after mix design optimization. On-site engineers primarily control the raw materials, pouring, curing, testing, and construction quality of the marine durable concrete.

[0003] The quality of on-site concrete is mainly controlled through workability, which is primarily reflected in the slump of the concrete. However, even when concrete meets the slump requirement, it can still exhibit defects such as segregation and bleeding. Therefore, the workability of concrete is assessed by technicians to determine whether it meets construction requirements and quality standards. However, this evaluation is rather abstract and cannot specifically reflect the differences in each concrete mix proportion.

[0004] On the other hand, the workability of concrete cannot be fully reflected by whether the aggregate, sand, and cementitious materials in the concrete are evenly distributed. Therefore, in order to improve the original indoor slump test, a circular divider was made. After the concrete after the slump test was divided into equal parts, the concrete was weighed, sieved, and washed with water to obtain the quantity, expected quantity, mass, and expected mass of aggregate in each region, as well as the mass and expected mass of slurry in each region.

[0005] To improve upon traditional methods for evaluating concrete workability, this invention proposes a method and system for assessing concrete workability. This method evaluates concrete workability by correlating the quantity and quality of aggregates in the concrete with the quality of the slurry. Summary of the Invention

[0006] To address the aforementioned problems, the present invention provides a method and system for evaluating the workability of concrete, which solves the problems of incompleteness and limited data in traditional methods for evaluating concrete workability.

[0007] To achieve the above-mentioned technical objectives, this application provides a method for evaluating the workability of concrete, comprising the following steps:

[0008] After collecting the aggregate distribution data of the concrete, the concrete is divided into equal parts to generate multiple equal areas.

[0009] Based on the expected values ​​of aggregate quantity, aggregate quality, and paste quality used to characterize the workability of concrete, the workability of concrete is evaluated by collecting the aggregate quantity, aggregate quality, and paste quality of each equally divided region and according to the weights corresponding to each set expected value.

[0010] Preferably, in the process of obtaining aggregate distribution information, the aggregate distribution information in different areas of the concrete is obtained based on the slump test method of concrete.

[0011] The concrete is divided into equal portions based on the distribution of aggregates.

[0012] Preferably, during the process of collecting the slurry quality, the concrete of each equally divided area is sieved through a 5mm sand sieve, and the slurry quality of each equally divided area is weighed.

[0013] Preferably, during the process of collecting the quantity and quality of stones in each equally divided area, the concrete in each equally divided area is cleaned until the mortar is washed away, thereby obtaining the quantity and quality of stones in each equally divided area.

[0014] Preferably, in obtaining the expected value of the aggregate quantity, the expected value of the aggregate quantity is obtained based on the aggregate quantity in the concrete and the number of equally divided areas, wherein the expected value of the aggregate quantity is:

[0015]

[0016] In the formula, x represents the expected number of stones, xi represents the number of stones in each equally divided region, and n represents the number of equally divided regions.

[0017] Preferably, in obtaining the expected value of aggregate quality, based on the aggregate quality of the concrete and according to the number of equally divided regions, the expected value of aggregate quality is obtained, wherein the expected value of aggregate quality is:

[0018]

[0019] In the formula, y represents the expected value of the stone quality, and yi represents the stone quality of each equally divided area.

[0020] Preferably, in obtaining the expected value of the grout quality, based on the grout quality of the concrete and according to the number of equally divided regions, the expected value of the grout quality is obtained, wherein the expected value of the grout quality is:

[0021]

[0022] In the formula, z represents the expected value of the slurry quality, and zi represents the slurry quality of each equally divided region.

[0023] Preferably, in the process of evaluating the workability of concrete, based on the expected values ​​of aggregate quantity, aggregate quality, and paste quality, an evaluation model is constructed using aggregate quantity, aggregate quality, and paste quality, and according to their weights, to evaluate the workability of concrete. The evaluation model is expressed as follows:

[0024]

[0025] in, λ1, λ2, and λ3 represent weights.

[0026] Preferably, after constructing the evaluation model, the workability of the unknown concrete is generated based on the evaluation model by collecting the quantity and quality of the aggregate and the quality of the paste.

[0027] This invention discloses a system for evaluating the workability of concrete, comprising:

[0028] The data acquisition module is used to collect data on the aggregate distribution in concrete.

[0029] The equal division module is used to divide concrete into equal parts, generating multiple equal division areas;

[0030] The evaluation module is used to evaluate the workability of concrete based on the expected values ​​of aggregate quantity, aggregate quality, and paste quality, which are used to characterize the workability of concrete. It collects the aggregate quantity, aggregate quality, and paste quality of each equally divided area and evaluates the concrete workability according to the weights corresponding to each set expected value.

[0031] The present invention discloses the following technical effects:

[0032] The method and system for evaluating the workability of concrete provided by this invention ensures accurate calculation results while being easy to operate and learn. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the equal division of concrete as described in this invention;

[0035] Figure 2 This is a flowchart of the steps described in this invention. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0037] like Figure 1-2 As shown, the present invention provides a method for evaluating the workability of concrete, comprising the following steps:

[0038] After collecting the aggregate distribution data of the concrete, the concrete is divided into equal parts to generate multiple equal areas.

[0039] Based on the expected values ​​of aggregate quantity, aggregate quality, and paste quality used to characterize the workability of concrete, the workability of concrete is evaluated by collecting the aggregate quantity, aggregate quality, and paste quality of each equally divided region and according to the weights corresponding to each set expected value.

[0040] More preferably, in the process of obtaining aggregate distribution, the present invention uses the slump test method of concrete to obtain the aggregate distribution in different areas of the concrete.

[0041] The concrete is divided into equal portions based on the distribution of aggregates.

[0042] More preferably, in the process of collecting the slurry quality, the concrete of each equally divided area is sieved through a 5mm sand sieve, and the slurry quality of each equally divided area is weighed.

[0043] More preferably, during the process of collecting the quantity and quality of stones in each equally divided area, the concrete in each equally divided area is cleaned until the mortar is washed away, thereby obtaining the quantity and quality of stones in each equally divided area.

[0044] More preferably, in the process of obtaining the expected value of the aggregate quantity, the present invention obtains the expected value of the aggregate quantity based on the aggregate quantity of the concrete and according to the number of equally divided regions, wherein the expected value of the aggregate quantity is:

[0045]

[0046] In the formula, x represents the expected number of stones, xi represents the number of stones in each equally divided region, and n represents the number of equally divided regions.

[0047] More preferably, in the process of obtaining the expected value of aggregate quality, the present invention obtains the expected value of aggregate quality based on the aggregate quality of the concrete and according to the number of equally divided regions, wherein the expected value of aggregate quality is:

[0048]

[0049] In the formula, y represents the expected value of the stone quality, and yi represents the stone quality of each equally divided area.

[0050] Further preferably, in the process of obtaining the expected value of the slurry quality, the present invention obtains the expected value of the slurry quality based on the slurry quality of the concrete and according to the number of equally divided regions, wherein the expected value of the slurry quality is:

[0051]

[0052] In the formula, z represents the expected value of the slurry quality, and zi represents the slurry quality of each equally divided region.

[0053] More preferably, in the process of evaluating the workability of concrete, the present invention constructs an evaluation model based on the expected values ​​of aggregate quantity, aggregate quality, and paste quality, according to the weights of aggregate quantity, aggregate quality, and paste quality, to evaluate the workability of concrete. The evaluation model is expressed as follows:

[0054]

[0055] in, λ1, λ2, and λ3 represent weights.

[0056] More preferably, after constructing the evaluation model, the present invention generates the concrete workability of the unknown concrete by collecting the quantity and quality of the aggregate, the mass and the slurry of the unknown concrete based on the evaluation model.

[0057] This invention discloses a system for evaluating the workability of concrete, comprising:

[0058] The data acquisition module is used to collect data on the aggregate distribution in concrete.

[0059] The equal division module is used to divide concrete into equal parts, generating multiple equal division areas;

[0060] The evaluation module is used to evaluate the workability of concrete based on the expected values ​​of aggregate quantity, aggregate quality, and paste quality, which are used to characterize the workability of concrete. It collects the aggregate quantity, aggregate quality, and paste quality of each equally divided area and evaluates the concrete workability according to the weights corresponding to each set expected value.

[0061] This invention discloses a computer program and a portable storage device. The computer program implements an evaluation method for an evaluation model, which evaluates the workability of concrete by acquiring three characteristics: the quantity of aggregate, the mass of aggregate, and the mass of slurry. The portable storage device is used to carry the evaluation system and evaluates the workability of concrete by interacting with a data acquisition device for concrete.

[0062] The present invention also discloses a workability assessment device based on concrete, comprising:

[0063] A slump test apparatus is used to conduct slump tests on concrete.

[0064] A slump divider is used to divide concrete after a slump test into equal areas by vertically cutting the concrete surface into several equal-area regions.

[0065] A workability analysis device is used to perform evaluation methods for the workability of concrete, determining the workability of concrete based on test data from different areas of the concrete.

[0066] Example 1: The method for evaluating the workability of concrete provided by the present invention includes the following process:

[0067] Based on the slump test method of concrete, the distribution of aggregate in different areas of concrete was obtained, and the concrete was divided into equal parts using a self-made equalizing device.

[0068] The concrete is divided into n equal regions, such as... Figure 1 As shown, A1 to A8 represent equally divided regions, which can be 8 regions, and the divider is made of steel plate;

[0069] The concrete in each area is sieved using a sand sieve, and the mass of the slurry in each area is weighed in turn. When selecting a sand sieve, it is selected according to actual needs. This invention selects a 5mm sand sieve, but it can also be 6mm, 7mm, etc.

[0070] After washing the mortar off the concrete in each area, record the quantity of aggregate (x) in each area. i The mass of the stone y i The mass of the slurry z i .

[0071] In the process of constructing the concrete workability assessment model, a divider was made of steel plate to obtain the quantity, expected quantity, quality, and expected quality of the stones in each area, as well as the quality of the grout in each area.

[0072] Based on the number, expected number, mass, and expected mass of coarse aggregate particles in each region, a workability assessment model is constructed to evaluate the workability of concrete. The expected number represents the minimum number of coarse aggregate particles under the workability condition, and the expected mass represents the minimum mass of coarse aggregate particles under the workability condition.

[0073] During the process of obtaining the number and quality of concrete aggregate particles, the concrete slump test value exceeded 100mm.

[0074] The concrete after the slump test is completed is divided into n equal-sized regions, where the height of the divider used for dividing is 20cm.

[0075] In constructing the concrete workability assessment model, the expected number of aggregates is expressed as:

[0076] The expected quantity ratio of stones is:

[0077]

[0078] The expected mass ratio of the stones is:

[0079]

[0080] The desired mass ratio of the slurry is:

[0081]

[0082] Where x represents the expected quantity of stones, y represents the expected quality of stones, and z represents the expected quality of the slurry.

[0083] In the process of constructing the concrete workability assessment model, the quantity ratio of stones in each area and the expected mass ratio of stones in each area are obtained based on the quantity of stones and the total mass of stones in a single area.

[0084] A concrete workability assessment model is constructed based on the quantity, expected quantity, mass ratio, and expected mass ratio of stones in each region.

[0085] The evaluation model for concrete workability is as follows:

[0086]

[0087] in, λ1, λ2, and λ3 are the weights of W1, W2, and W3, respectively.

[0088] The evaluation method designed in this invention solves the problem of inaccurate evaluation caused by incomplete methods and limited data in traditional concrete performance evaluation, and provides a new technical approach for concrete performance evaluation.

[0089] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0090] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0091] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for evaluating the workability of concrete, characterized in that, Includes the following steps: After collecting the aggregate distribution data of the concrete, the concrete is divided into multiple equal regions. Based on the expected values ​​of aggregate quantity, aggregate quality, and paste quality used to characterize the workability of concrete, the workability of concrete is evaluated by collecting the aggregate quantity, aggregate quality, and paste quality of each of the equally divided regions and according to the weights corresponding to each set expected value. In the process of obtaining aggregate distribution, the aggregate distribution in different areas of the concrete is obtained based on the concrete slump test method. During the process of collecting the slurry mass, the concrete of each of the equal divisions is sieved through a 5mm sand sieve, and the mass of the slurry of each of the equal divisions is weighed. During the process of collecting the number and quality of stones in each equally divided area, the concrete in each equally divided area is cleaned until the mortar is washed away, and the number and quality of stones in each equally divided area are obtained. In obtaining the expected value of the aggregate quantity, based on the aggregate quantity of the concrete and according to the number of equally divided regions, the expected value of the aggregate quantity is obtained, wherein the expected value of the aggregate quantity is: ， In the formula, x This represents the expected number of stones. x i This indicates the number of stones in each equally divided region. n Indicates the number of equally divided regions; In obtaining the expected value of the aggregate quality, based on the aggregate quality of the concrete and according to the number of equally divided regions, the expected value of the aggregate quality is obtained, wherein the expected value of the aggregate quality is: ， In the formula, y This represents the expected quality of the gravel. y i This indicates the mass of the stones in each equally divided region; In obtaining the expected value of the slurry quality, based on the slurry quality of the concrete and according to the number of equally divided regions, the expected value of the slurry quality is obtained, wherein the expected value of the slurry quality is: ， In the formula, z This represents the expected quality of the slurry. z i This indicates the mass of the slurry in each equally divided region; In evaluating the workability of concrete, based on the expected values ​​of aggregate quantity, aggregate mass, and paste mass, and according to the weights of the aggregate quantity, aggregate mass, and paste mass, an evaluation model is constructed to assess the workability of the concrete. The evaluation model is expressed as follows: ， in, , , λ1, λ2, and λ3 represent weights.

2. The method for evaluating the workability of concrete according to claim 1, characterized in that: After constructing the evaluation model, the workability of the unknown concrete is generated based on the evaluation model by collecting the quantity and quality of the aggregate and the mass of the paste.

3. A system for evaluating the workability of concrete, characterized in that, The system is capable of implementing the method for evaluating the workability of concrete as described in any one of claims 1-2; the system comprises: The data acquisition module is used to collect data on the aggregate distribution in concrete. The equal division module is used to divide the concrete into equal parts to generate multiple equal division regions; The evaluation module is used to characterize the workability of concrete by collecting the expected values ​​of aggregate quantity, aggregate quality, and paste quality in each of the equally divided regions, and evaluating the workability of the concrete according to the weights corresponding to each set expected value.

Images