Digital preparation method of concrete with adjustable setting performance

Abstract

The invention relates to the technical field of concrete preparation, in particular to a digital preparation method of concrete with adjustable setting performance. The invention relates to a digital preparation method of concrete with adjustable setting performance, which comprises the following steps of: firstly, acquiring setting time when retarding type water reducing agents with different components are used under different environment temperature and humidity according to a certain concrete ratio, and obtaining a setting performance quantification table; and acquiring the environment temperature and humidity and the required setting time at the concrete pouring position, so as to select the retarding type water reducing agent of the corresponding components of which the setting time is greater than the required setting time in the setting performance quantification table to prepare the concrete. The required setting time comprises concrete mixing and discharging time, mixer truck transportation and distribution time, engineering site mixer truck queuing and discharging time and concrete pumping time. And on the premise of meeting the requirement of engineering construction on concrete setting time, cold joints in concrete construction are prevented, the volume stability of the concrete is improved, and the risk of shrinkage cracking of the concrete is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete preparation, and particularly to a digital preparation method for concrete with adjustable setting performance. Background Art

[0002] Current building construction often uses the method of concrete pouring, and the concrete mixing plant plays an important role in the process of using concrete. The concrete mixing plant is mainly responsible for mixing cement, sand, water and other admixtures according to a certain ratio to produce concrete that meets different requirements.

[0003] The setting time of concrete refers to the time period from the start of concrete mixing to its start of hardening and finally reaching a certain hardness (i.e., initial setting). At the construction site, the concrete will be poured to the required position, and the mold will be filled by the flow of the concrete. In order to reduce the air bubbles inside the concrete after setting, vibration is usually required. All these operations need to be completed before the initial setting of the concrete. Therefore, for concrete, the setting time of concrete is a very important indicator. The setting time of concrete is crucial for ensuring the construction quality, safety and construction progress of concrete. In actual construction, the mix ratio of concrete and the use of admixtures should be adjusted according to specific conditions to ensure that the concrete reaches the required setting state within the correct time. In the prior art, the experience of workers is often used to prepare concrete, or the setting time of concrete is deliberately extended to ensure that the concrete does not set before necessary operations are carried out. Summary of the Invention

[0004] In view of this, the present invention provides a digital preparation method for concrete with adjustable setting performance, which is used to solve the problem in the prior art that in order to ensure that the concrete is in an un-set state before being filled into the mold at the construction site, the setting time of the concrete is increased, resulting in an extended construction period.

[0005] A digital preparation method for concrete with adjustable setting performance, first obtain the setting time when using different components of retarder water reducers at different ambient temperatures and humidities for a certain concrete mix ratio, obtain a setting performance quantification table, obtain the ambient temperature and humidity at the concrete pouring position and the required setting time, and select the retarder water reducer with the corresponding component whose setting time is greater than the required setting time in the setting performance quantification table for concrete preparation. The required setting time includes the concrete mixing and discharging time, the mixing truck transportation and distribution time, the mixing truck queuing and unloading time at the construction site, and the concrete pumping time.

[0006] Further, the mixing truck transportation and distribution time is obtained according to the estimated time from the mixing plant to the destination in the navigation software.

[0007] Further, the transportation and delivery time of the mixer truck is not less than 1.1 times the quotient of the distance and the average vehicle speed during the delivery time period.

[0008] Further, the setting time of the concrete under different components and different environmental temperatures and humidities is obtained through experiments.

[0009] Further, before pumping the concrete into the mold at the construction site, the concrete is sampled and a setting time experiment is carried out to verify the setting time of this batch of concrete.

[0010] The beneficial effects of the digital preparation method of concrete with adjustable setting performance in the present invention are as follows: Firstly, the setting time of a certain concrete mix ratio under different environmental temperatures and humidities when using different components of retarder water reducers is obtained to obtain a setting performance quantification table, which is convenient to directly obtain different setting times; the ideal setting time should have a small difference from the sum of the mixing, transportation, and pumping times, so as to meet the requirement that the concrete can set within a short time after being filled into the mold; by obtaining the setting time of the concrete under different components and different environmental temperatures and humidities, it is convenient to select components according to the on-site environment to adjust the actual setting time. By combining the digital central control system of the mixing plant to calculate the concrete mixing and discharging time, the mixer truck transportation and delivery time, the mixer truck queuing and unloading time at the construction site, and the concrete pumping time, the time from the start of mixing to being filled into the construction site can be known, that is, the required setting time. According to the required setting time, select the components with an actual setting time longer than the required setting time under the current environmental temperature and humidity, and then shorten the setting time as much as possible under the premise of meeting the conditions, shorten the construction period, and thus solve the problem in the prior art that in order to ensure that the concrete is in an un-set state before being filled into the mold at the construction site, the setting time of the concrete is prolonged, resulting in an extended construction period. Specific Embodiments

[0011] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be described through specific embodiments below. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0012] The terms used in the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The singular forms "a", "the", and "said" used in the present disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0013] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, such information should not be limited to these terms and should not be construed as indicating or implying relative importance. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "when" or "while" or "in response to determining".

[0014] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms longitudinal, transverse, upper, lower, front, rear, left, right, vertical, horizontal, top, bottom, inner, outer, etc. are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0015] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms installation, connection, and coupling should be understood in a broad sense. For example, it may be a mechanical connection or an electrical connection, or it may be the communication inside two elements. It may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0016] In the subsequent description, the suffixes such as "module", "component", or "unit" used to represent elements are only for the convenience of describing the present invention, and they do not have a specific meaning in themselves. Therefore, "module" and "component" can be used interchangeably.

[0017] For a better understanding of the technical solution of the present invention, the present invention will be described in detail below.

[0018] In Example 1 of the digital preparation method of concrete with adjustable setting performance (hereinafter referred to as the digital preparation method) in the present invention:

[0019] The purpose expected to be achieved by this digital preparation method is to adjust the setting time of the concrete by adjusting the components, so that the time from preparation to filling into the mold is roughly equivalent to the setting time of the concrete, thereby reducing the waste of time and enabling the concrete filled into the mold to enter the setting process after the necessary procedures, shortening the waiting time for the next process.

[0020] The digital preparation method first requires the selection of raw materials. Concrete has different types. First, a certain concrete mix ratio is selected according to the stable raw materials of the mixing station and the strength and workability requirements of the concrete at the construction site. In this embodiment, the C40 concrete mix ratio is selected according to the construction site requirements. The specific mix ratio is shown in Table 1:

[0021] Table 1 Concrete mix ratio (kg / m 3 )

[0022] Water Cement Fly ash Ground granulated blast-furnace slag Sand 5 - 16mm crushed stone 5 - 25mm crushed stone Retarding water reducer 170 244 81 100 785 200 765 4.25

[0023] The slow-setting water reducer uses white sugar and sodium gluconate as the retarding components of the admixture. The dosage ratio of white sugar in the slow-setting water reducer is 2.5-15 kg / ton; the dosage ratio of sodium gluconate is 15-30 kg / ton. During the experiment, the concrete setting time experiment was carried out. The setting time of concrete under different ambient temperature and humidity and different components of concrete slow-setting water reducers was recorded, and the setting performance quantitative table was obtained, as shown in Table 2:

[0024] Table 2 Quantification table of condensation performance

[0025]

[0026] It can be seen from Table 2 that, under different temperatures and humidities, changing the proportion and content of the retarding component in the retarding water reducing agent can affect the setting time of concrete. Therefore, in the actual use process, by controlling the components, the actual setting time can be slightly longer than the required setting time to meet the setting requirements of the concrete, and at the same time, the concrete can be set as soon as possible after filling. Of course, in other implementations, if relevant data can be found, confirmed detailed and reliable data can also be used directly. In this embodiment, the interference of external factors can be eliminated as much as possible through experiments, making the results more accurate and reliable.

[0027] Among them, the required setting time includes the concrete mixing and discharging time, the transit time of the mixer truck, the queuing and discharging time of the mixer truck at the construction site, and the concrete pumping time. That is to say, the time from the production of concrete to its filling into the mold is included, and these times shall not be less than the setting time. Among them, pumped concrete refers to the concrete pumped into the mold by pumping equipment at the construction site. The pumping time of pumped concrete is equal to the total amount of concrete required for one pouring divided by the pumping speed, and the pumping speed is equal to the pumping volume of a single piece of equipment multiplied by the number of equipment used. The mixing and discharging time is the time required to evenly mix concrete materials such as cement, water, and mineral powder. This time is related to the mixing equipment used. Usually, for a certain range of concrete volume, this time is determined. The transit time of the transport vehicle can be obtained according to the estimated time from the mixing plant to the destination in the navigation software. To avoid extended time caused by unexpected situations such as traffic jams, the transit time of the mixer truck shall not be less than 1.1 times the quotient of the distance divided by the average vehicle speed during this delivery period, thereby providing a redundancy value for transportation and also ensuring that there is no overly long waiting period. Of course, in other embodiments, other redundancy values can also be adopted. Finally, it should be noted that before filling, it is also necessary to sample and test the concrete to verify that the setting time of this batch of concrete corresponds to the data in Table 2.

[0028] In a certain actual concrete pouring, the temperature measured on-site was 35°C and the relative humidity was 50%. The required setting time was calculated in advance. 2 fixed pumps were used to pump the concrete. According to the total volume of concrete required and the pumping speed of the fixed pumps, the total time required to complete pumping the concrete was estimated to be 6 hours. In addition, the concrete mixing and discharging time, the transit time of the mixer truck, and the longest queuing and discharging time of the mixer truck at the construction site were calculated to be 2 hours. Therefore, the initial setting time required for the bottom slab pouring construction was 8 hours. According to the data in Table 2, the retarding components, 12.5 kg / ton of white sugar and 30 kg / ton of sodium gluconate, were selected. Concrete was taken at the construction site and the setting time test was carried out. The initial setting time of the concrete met the requirements. The hardening condition of the concrete at the construction site was consistent with the expectation. There was no concrete cold joint situation, and the volume stability of the concrete was good, realizing the digital preparation and lean construction of the concrete.

[0029] It should be clear that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Claims

1. A digital preparation method for concrete with adjustable coagulation properties, characterized in that: First, the setting time of slow-setting water-reducing agents of different components under different ambient temperatures and humidities for a certain concrete mix ratio is obtained to obtain a quantitative table of setting performance, and the ambient temperature and humidity at the concrete pouring location and the required setting time are obtained to select a slow-setting water-reducing agent of the corresponding component whose setting time is greater than the required setting time in the quantitative table of setting performance for concrete preparation. The required setting time includes the concrete mixing and discharging time, the mixer truck transportation and delivery time, the mixer truck queuing unloading time at the construction site, and the concrete pumping time.

2. The method for preparing concrete digitally with adjustable coagulation properties according to claim 1, characterized in that: The transportation and delivery time of the mixer truck is obtained according to the estimated time from the mixer station to the destination in the navigation software.

3. The method for preparing concrete digitally with adjustable coagulation properties according to claim 2 is characterized in that: The transportation and delivery time of a mixer truck shall not be less than 1.1 times the quotient of the distance and the average vehicle speed during the delivery period.

4. The method for preparing concrete digitally with adjustable coagulation properties according to any one of claims 1 to 3, characterized in that: The setting time obtained for a certain concrete mix ratio when using slow-setting water-reducing agents of different components under different ambient temperatures and humidities is obtained by experiments.

5. The method for preparing digital concrete with adjustable coagulation properties according to any one of claims 1 to 3, characterized in that: Before pumping concrete into the molds at the project site, the concrete is sampled and a setting time test is performed to verify the setting time of the batch of concrete.

6. The method for preparing digital concrete with adjustable setting properties according to any one of claims 1 to 3, characterized in that: The retarding component in the retarding water reducing agent includes white sugar and sodium gluconate.

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