WO2023065592A1 - Fresh concrete working performance control method based on pouring construction performance target regulation and control - Google Patents
Fresh concrete working performance control method based on pouring construction performance target regulation and control Download PDFInfo
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- the invention relates to a concrete working performance control method, in particular to a fresh concrete working performance control method based on pouring construction performance target regulation.
- Fresh concrete with poor working performance on the one hand, is too viscous, which will increase the construction difficulty; on the other hand, it will cause segregation and bleeding if it is too thin, which will not only cause blockage of concrete pumping, affect the construction process, but also affect the final concrete structure of compactness.
- the degree of expansion test is used to characterize the performance of concrete.
- the traditional method mainly controls the working performance of concrete at the concrete discharge node to ensure that the concrete discharged from the mixing station is in good condition. Adding additional additives and other means to re-adjust the working performance not only increases the difficulty of on-site personnel's operation, but also delays the construction time. At the same time, with the application of new admixtures in concrete, it is becoming more and more difficult to grasp the change law of the working performance of concrete from the discharge node to the construction node.
- the present invention provides a method for controlling the working performance of fresh concrete based on regulation and control of pouring construction performance targets.
- the concrete construction node is used as the control base point of work performance.
- the method can grasp the change law of concrete working performance under different intervals and environmental conditions, control the working performance of concrete construction nodes in the most suitable range for construction, improve the construction quality, and ensure the compactness of the final concrete structure.
- a kind of fresh concrete working performance control method based on perfusion construction performance target regulation and control comprises the following steps:
- W(t) is the expansion degree of concrete corresponding to different times, mm; T is the ambient temperature under different working conditions, °C; t is the interval time between mixing and construction, min; ⁇ is the expansion degree of freshly mixed concrete, mm ; a, b, c, d are temperature correlation coefficients;
- the concrete construction node As the work performance control base point, according to the interval time between concrete discharge and construction and the site environmental conditions, it is calculated that the concrete can be used under this working condition.
- the construction node meets the control requirements of the fresh concrete discharge node of the control target.
- the work performance control method of fresh concrete based on the control of pouring construction performance targets reduces the difficulty of operation for on-site construction personnel, reduces the risk of concrete pumping pipe plugging, and poor pouring density. have strong feasibility.
- the fresh concrete working performance control method based on pouring construction performance target regulation of the present invention comprises the following steps:
- W(t) is the expansion degree of concrete corresponding to different times, mm; T is the ambient temperature under different working conditions, °C; t is the interval time between mixing and construction, min; ⁇ is the expansion degree of freshly mixed concrete, mm ; a, b, c, d are temperature correlation coefficients; the fitting result is:
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Abstract
A fresh concrete working performance control method based on pouring construction performance target regulation and control, comprising the following steps: (1) carrying out fresh concrete working performance time-dependent test under various working conditions to obtain concrete working performance time-varying data; (2) establishing a concrete working performance time-varying model based on different working conditions; and (3) determining relevant parameters of the concrete working performance time-varying model according to different working conditions and a working performance control index of a construction node, and calculating the working performance control index of fresh concrete. According to the method, the working performance of the concrete construction node can be controlled, the time evolution rule of the working performance of concrete under different environmental conditions is considered, and the defect that in a traditional method, the working performance of fresh concrete at a stirring and discharging node serves as a control base point, time-varying fluctuation of the working performance is not quantitatively represented and considered, and consequently the concrete state is unstable during construction is overcome.
Description
本发明涉及一种混凝土工作性能控制方法，具体是一种基于灌注施工性能目标调控的新拌混凝土工作性能控制方法。The invention relates to a concrete working performance control method, in particular to a fresh concrete working performance control method based on pouring construction performance target regulation.
在混凝土结构的施工建设中，为保证混凝土施工的密实性及均匀性并且方便进行拌和、运输、浇筑、振捣等操作，要求新拌混凝土必须具有良好的工作性能。工作性能不良的新拌混凝土，一方面过于黏稠会增加施工难度，另一方面过稀则会导致离析与泌水，不仅会造成混凝土泵送的堵管，影响施工进程，也会影响最终混凝土结构的密实性。In the construction of concrete structures, in order to ensure the compactness and uniformity of concrete construction and to facilitate operations such as mixing, transportation, pouring, and vibration, fresh concrete must have good working performance. Fresh concrete with poor working performance, on the one hand, is too viscous, which will increase the construction difficulty; on the other hand, it will cause segregation and bleeding if it is too thin, which will not only cause blockage of concrete pumping, affect the construction process, but also affect the final concrete structure of compactness.
因此，为确保工程质量及施工的顺利进行，需要对新拌混凝土进行严格的工作性能控制。在工程现场施工时存在几个混凝土工作性能的主要控制节点，主要包含混凝土在搅拌站出料的工作性能控制节点，运输到现场进行浇筑施工的工作性能控制节点，在各控制节点通过进行坍落度扩展度测试对混凝土工作性能进行表征。传统方法主要在混凝土出料节点进行混凝土工作性能控制，保证搅拌站出料混凝土状态良好，运输至浇筑施工现场后的工作性能往往已经与浇筑施工所需的最佳工作性能相差甚远，需通过额外添加外加剂等手段重新进行工作性能调整，既加大了现场人员操作的难度，也耽误了施工时间。与此同时，随着新型外加剂在混凝土中的应用，混凝土工作性能从出料节点到施工节点的工作性能变化规律愈发难以掌握。Therefore, in order to ensure the quality of the project and the smooth progress of the construction, it is necessary to strictly control the work performance of the fresh concrete. There are several main control nodes of concrete work performance during the construction of the project site, mainly including the work performance control nodes of the concrete at the mixing station, the work performance control nodes of transporting to the site for pouring construction, and the slump at each control node The degree of expansion test is used to characterize the performance of concrete. The traditional method mainly controls the working performance of concrete at the concrete discharge node to ensure that the concrete discharged from the mixing station is in good condition. Adding additional additives and other means to re-adjust the working performance not only increases the difficulty of on-site personnel's operation, but also delays the construction time. At the same time, with the application of new admixtures in concrete, it is becoming more and more difficult to grasp the change law of the working performance of concrete from the discharge node to the construction node.
针对环境条件、搅拌与施工的间隔时间等因素，把握混凝土工作性能经时演变规律，就能合理把握不同时间混凝土的工作性能变化规律，控制混凝土工作性能在施工时达最佳施工性能。According to factors such as environmental conditions, mixing and construction intervals, grasping the evolution law of concrete work performance over time, we can reasonably grasp the change law of concrete work performance at different times, and control the work performance of concrete to achieve the best construction performance during construction.
发明内容Contents of the invention
为保证混凝土的施工质量，本发明提供了一种基于灌注施工性能目标调控的新拌混凝土工作性能控制方法。通过考虑不同环境条件下混凝土工作性能经时演变规律，采用混凝土施工节点作为工作性能控制基点。该方法能够在不同间隔时间、环境条件下，把握混凝土工作性能的变化规律，控制混凝土施工节点的工作性能在最适合施工的范围内，提高了施工质量，保障了最终混凝土结构的密实性。In order to ensure the construction quality of concrete, the present invention provides a method for controlling the working performance of fresh concrete based on regulation and control of pouring construction performance targets. By considering the time-dependent evolution of concrete work performance under different environmental conditions, the concrete construction node is used as the control base point of work performance. The method can grasp the change law of concrete working performance under different intervals and environmental conditions, control the working performance of concrete construction nodes in the most suitable range for construction, improve the construction quality, and ensure the compactness of the final concrete structure.
本发明通过以下述技术方案实现上述目的：一种基于灌注施工性能目标调控的新拌混凝 土工作性能控制方法，包括以下步骤:The present invention realizes above-mentioned purpose by following technical scheme: a kind of fresh concrete working performance control method based on perfusion construction performance target regulation and control, comprises the following steps:
(1)开展多种工况下新拌混凝土工作性能经时测试，得到混凝土工作性能时变数据：在工程所在地对应的日最高温度、日最低温度及日平均温度下制备混凝土，控制混凝土初始扩展度分别为650mm，每隔20分钟进行混凝土工作性能经时测试，得到不同条件下不同经时混凝土的扩展度；(1) Carry out time-lapse tests on the working performance of fresh concrete under various working conditions, and obtain the time-varying data of concrete working performance: prepare concrete at the daily maximum temperature, daily minimum temperature and daily average temperature corresponding to the project location, and control the initial expansion of concrete The working performance of concrete is tested every 20 minutes to obtain the expansion degree of concrete with different time under different conditions;
(2)建立基于不同工况条件的混凝土工作性能时变模型：对混凝土工作性能经时测试结果进行最小二乘法拟合，基于不同工况条件参数建立混凝土工作性能时变模型，所述基于不同工况条件的混凝土工作性能时变模型为：(2) Establish a time-varying model of concrete work performance based on different working conditions: the least squares method is used to fit the time-lapse test results of concrete work performance, and a time-varying model of concrete work performance is established based on parameters of different working conditions. The time-varying model of concrete working performance under working conditions is:
W(t)＝(aT+b)t
2+(cT+d)t+λ
W(t)=(aT+b)t 2 +(cT+d)t+λ
式中：W(t)为不同时间对应的混凝土扩展度，mm；T为不同工况下的环境温度，℃；t为搅拌与施工的间隔时间，min；λ为新拌混凝土扩展度，mm；a、b、c、d为温度相关系数；In the formula: W(t) is the expansion degree of concrete corresponding to different times, mm; T is the ambient temperature under different working conditions, ℃; t is the interval time between mixing and construction, min; λ is the expansion degree of freshly mixed concrete, mm ; a, b, c, d are temperature correlation coefficients;
(3)根据不同工况条件及施工节点的工作性能控制指标，确定混凝土工作性能时变模型相关参数，计算新拌混凝土的工作性能控制指标：确定当前工况的温度T、搅拌与施工的间隔时间t以及施工所需的混凝土最佳工作性能对应扩展度W(t)，在模型中代入当前工况环境温度、搅拌与施工间隔时间及目标扩展度，计算出在该间隔时间条件下可使混凝土在施工时达到目标扩展度的新拌混凝土扩展度λ。(3) According to different working conditions and working performance control indicators of construction nodes, determine the relevant parameters of the concrete working performance time-varying model, and calculate the working performance control indicators of fresh concrete: determine the temperature T of the current working condition, the interval between mixing and construction Time t and the expansion degree W(t) corresponding to the best working performance of concrete required for construction, the current working condition ambient temperature, the interval between mixing and construction and the target expansion degree are substituted into the model, and the available time under the condition of this interval is calculated. The degree of fresh concrete expansion λ at which the concrete reaches the target expansion degree during construction.
考虑不同环境条件下混凝土工作性能经时演变规律，采用混凝土施工节点作为工作性能控制基点，根据混凝土出料到施工之间的间隔时间及现场环境条件，计算出在该工况下可使混凝土在施工节点达到控制目标的新拌混凝土出料节点控制要求。Considering the evolution law of concrete work performance over time under different environmental conditions, using the concrete construction node as the work performance control base point, according to the interval time between concrete discharge and construction and the site environmental conditions, it is calculated that the concrete can be used under this working condition. The construction node meets the control requirements of the fresh concrete discharge node of the control target.
本发明的突出优点在于：The outstanding advantages of the present invention are:
基于灌注施工性能目标调控的新拌混凝土工作性能控制方法，相较于传统的工作性能控制方法，减少了现场施工人员的操作难度，降低了混凝土泵送堵管、浇筑密实度不佳的风险，具有较强的可行性。Compared with the traditional work performance control method, the work performance control method of fresh concrete based on the control of pouring construction performance targets reduces the difficulty of operation for on-site construction personnel, reduces the risk of concrete pumping pipe plugging, and poor pouring density. have strong feasibility.
能够针对环境条件、搅拌与施工间隔时间，把握混凝土工作性能经时演变规律，控制混凝土工作性能在施工时达最佳施工性能。According to environmental conditions, mixing and construction interval time, grasp the evolution law of concrete work performance over time, and control the work performance of concrete to achieve the best construction performance during construction.
以下结合实施例对本发明的技术方案作进一步详细描述。The technical solution of the present invention will be further described in detail below in conjunction with the examples.
实施例1Example 1
本发明所述的基于灌注施工性能目标调控的新拌混凝土工作性能控制方法，包括以下步 骤：The fresh concrete working performance control method based on pouring construction performance target regulation of the present invention comprises the following steps:
(1)开展多种工况下新拌混凝土工作性能经时测试，得到混凝土工作性能时变数据：在工程所在地对应的日最高温度、日最低温度及日平均温度下制备混凝土，控制混凝土初始扩展度分别为650mm，每隔20分钟进行混凝土工作性能经时测试，得到不同条件下不同经时混凝土的扩展度。测试的环境温度及测试结果如表1所示：(1) Carry out time-lapse tests on the working performance of fresh concrete under various working conditions, and obtain the time-varying data of concrete working performance: prepare concrete at the daily maximum temperature, daily minimum temperature and daily average temperature corresponding to the project location, and control the initial expansion of concrete The working performance of concrete is tested every 20 minutes to obtain the expansion degree of concrete with different time under different conditions. The ambient temperature and test results of the test are shown in Table 1:
表1环境条件及混凝土工作性能经时测试结果Table 1 Environmental conditions and time-lapse test results of concrete working performance
(2)建立基于不同工况条件的混凝土工作性能时变模型：对混凝土工作性能经时测试结果进行最小二乘法拟合，基于不同环境条件参数建立混凝土工作性能时变模型。所述基于不同工况条件的混凝土工作性能时变模型为：(2) Establish a time-varying model of concrete work performance based on different working conditions: the least squares method is used to fit the time-lapse test results of concrete work performance, and a time-varying model of concrete work performance is established based on different environmental condition parameters. The time-varying model of concrete working performance based on different working conditions is:
W(t)＝(aT+b)t
2+(cT+d)t+λ
W(t)=(aT+b)t 2 +(cT+d)t+λ
式中：W(t)为不同时间对应的混凝土扩展度，mm；T为不同工况下的环境温度，℃；t为搅拌与施工的间隔时间，min；λ为新拌混凝土扩展度，mm；a、b、c、d为温度相关系数；拟合结果为：In the formula: W(t) is the expansion degree of concrete corresponding to different times, mm; T is the ambient temperature under different working conditions, ℃; t is the interval time between mixing and construction, min; λ is the expansion degree of freshly mixed concrete, mm ; a, b, c, d are temperature correlation coefficients; the fitting result is:
W(t)＝(8×10
-5T-0.01671)t
2+(-0.05807T+3.202)t+λ
W(t)＝(8×10 -5 T-0.01671)t 2 +(-0.05807T+3.202)t+λ
(3)根据不同工况条件及施工节点的工作性能控制指标，确定混凝土工作性能时变模型相关参数，计算新拌混凝土的工作性能控制指标：确定当前工况的温度T为25.6℃，搅拌与施工的间隔时间t为45分钟，以及施工所需的混凝土最佳工作性能对应扩展度W(t)为680mm。代入当前工况环境温度，得到计算模型如下：(3) According to different working conditions and working performance control indicators of construction nodes, determine the relevant parameters of the time-varying model of concrete working performance, and calculate the working performance control indicators of freshly mixed concrete: determine the temperature T of the current working condition as 25.6°C, mix and The interval time t of construction is 45 minutes, and the expansion degree W(t) corresponding to the best working performance of concrete required for construction is 680mm. Substituting the ambient temperature in the current working condition, the calculation model is obtained as follows:
W(t)＝-1.47×10
-2t
2+1.716t+λ
W(t)＝-1.47×10 -2 t 2 +1.716t+λ
代入搅拌与施工间隔时间及目标扩展度，计算出在条件下可使混凝土在施工时达到目标扩展度的新拌混凝土扩展度λ为632mm。Substituting the interval between mixing and construction and the target expansion degree, it is calculated that the fresh concrete expansion degree λ that can make the concrete reach the target expansion degree during construction under the conditions is 632mm.
Claims (5)
- 一种基于灌注施工性能目标调控的新拌混凝土工作性能控制方法，其特征在于，包括以下步骤：A method for controlling the work performance of fresh concrete based on regulation and control of pouring construction performance targets, characterized in that it includes the following steps:(1)开展多种工况下新拌混凝土工作性能经时测试，得到混凝土工作性能时变数据：在工程所在地对应的日最高温度、日最低温度及日平均温度下制备混凝土，控制混凝土初始扩展度分别为650mm，每隔20分钟进行混凝土工作性能经时测试，得到不同条件下不同经时混凝土的扩展度；(1) Carry out time-lapse tests on the working performance of fresh concrete under various working conditions, and obtain the time-varying data of concrete working performance: prepare concrete at the daily maximum temperature, daily minimum temperature and daily average temperature corresponding to the project location, and control the initial expansion of concrete The working performance of concrete is tested every 20 minutes to obtain the expansion degree of concrete with different time under different conditions;(2)建立基于不同工况条件的混凝土工作性能时变模型：对混凝土工作性能经时测试结果进行最小二乘法拟合，基于不同工况条件参数建立混凝土工作性能时变模型，所述基于不同工况条件的混凝土工作性能时变模型为：(2) Establish a time-varying model of concrete work performance based on different working conditions: the least squares method is used to fit the time-lapse test results of concrete work performance, and a time-varying model of concrete work performance is established based on parameters of different working conditions. The time-varying model of concrete working performance under working conditions is:W(t)＝(aT+b)t 2+(cT+d)t+λ W(t)=(aT+b)t 2 +(cT+d)t+λ式中：W(t)为不同时间对应的混凝土扩展度，mm；T为不同工况下的环境温度，℃；t为搅拌与施工的间隔时间，min；λ为新拌混凝土扩展度，mm；a、b、c、d为温度相关系数；In the formula: W(t) is the expansion degree of concrete corresponding to different times, mm; T is the ambient temperature under different working conditions, ℃; t is the interval time between mixing and construction, min; λ is the expansion degree of freshly mixed concrete, mm ; a, b, c, d are temperature correlation coefficients;(3)根据不同工况条件及施工节点的工作性能控制指标，确定混凝土工作性能时变模型相关参数，计算新拌混凝土的工作性能控制指标：确定当前工况的温度T、搅拌与施工的间隔时间t以及施工所需的混凝土最佳工作性能对应扩展度W(t)，在模型中代入当前工况环境温度、搅拌与施工间隔时间及目标扩展度，计算出在该间隔时间条件下可使混凝土在施工时达到目标扩展度的新拌混凝土扩展度λ。(3) According to different working conditions and working performance control indicators of construction nodes, determine the relevant parameters of the concrete working performance time-varying model, and calculate the working performance control indicators of fresh concrete: determine the temperature T of the current working condition, the interval between mixing and construction Time t and the expansion degree W(t) corresponding to the best working performance of concrete required for construction, the current working condition ambient temperature, the interval between mixing and construction and the target expansion degree are substituted into the model, and the available time under the condition of this interval is calculated. The degree of fresh concrete expansion λ at which the concrete reaches the target expansion degree during construction.
- 根据权利要求1所述的一种基于灌注施工性能目标调控的新拌混凝土工作性能控制方法，其特征在于，所述的混凝土施工节点为混凝土运输至施工平台，开始将混凝土从罐车倒入泵车进行泵送或直接进行人工浇筑的时间节点。A fresh concrete work performance control method based on pouring construction performance target regulation according to claim 1, characterized in that, the concrete construction node is that the concrete is transported to the construction platform, and the concrete is poured from the tank truck into the pump truck Time node for pumping or direct manual pouring.
- 根据权利要求1所述的一种基于灌注施工性能目标调控的新拌混凝土工作性能控制方法，其特征在于，所述的混凝土出料到施工之间的间隔时间为从混凝土由搅拌机中倒出开始，到混凝土进入泵车进行泵送或直接进行人工浇筑之间的间隔时间。According to claim 1, a method for controlling work performance of fresh concrete based on regulation and control of pouring construction performance targets, is characterized in that the interval between the discharge of the concrete and the construction is from the time when the concrete is poured out from the mixer , to the interval between the concrete entering the pump truck for pumping or direct manual pouring.
- 根据权利要求1所述的一种基于灌注施工性能目标调控的新拌混凝土工作性能控制方法，其特征在于，所述的混凝土施工现场环境条件为混凝土在运输、施工等过程中的环境温度。The work performance control method of fresh concrete based on pouring construction performance target regulation according to claim 1, characterized in that the environmental conditions of the concrete construction site are the ambient temperature of the concrete during transportation and construction.
- 根据权利要求1所述的一种基于灌注施工性能目标调控的新拌混凝土工作性能控制方 法，其特征在于，所述的新拌混凝土出料节点控制要求为在温度作用下，随时间变化能够使得混凝土在施工时达到合理工作性能的混凝土搅拌完成时刻的混凝土工作性能控制要求。A fresh concrete working performance control method based on pouring construction performance target regulation according to claim 1, characterized in that, the control requirement of the fresh concrete discharge node is that under the action of temperature, the change over time can make Concrete work performance control requirements at the moment when concrete mixing is completed to achieve reasonable work performance during construction.
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