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Method for measuring and calculating actual strength of concrete on construction site

A technology of concrete strength and construction site, applied in the field of concrete, can solve the problems of application restriction, inability to establish concrete strength and age, etc., and achieve the effect of good universality and accurate concrete strength data.

Active Publication Date: 2020-06-05
SHANGHAI CONSTRUCTION GROUP
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Problems solved by technology

For the case where the test is not allowed on the construction site, the application of this method is restricted due to the inability to establish an effective relationship between the actual concrete strength and age

Method used

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  • Method for measuring and calculating actual strength of concrete on construction site
  • Method for measuring and calculating actual strength of concrete on construction site

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Embodiment 1

[0045] Combine below figure 1 and figure 2 , to describe in detail the method for measuring and calculating the actual strength of concrete at the construction site of the present invention.

[0046] Please refer to figure 1 and figure 2 , a method for measuring and calculating the actual strength of concrete at a construction site, comprising:

[0047] Step 1. Obtain the strength of concrete at each age considering the comprehensive influence factors of concrete strength under the standard maintenance conditions of the laboratory, and record the temperature and humidity changes inside the corresponding concrete, and calculate the equivalent age by using formula (1):

[0048] t e =∑[1 / ( α u − α 0 )]·( T i / T r ) −m exp((− E a / R )·(1 / T i −1 / T r ))·[ H i ·Δ t i +((1− H i ) / β )·ln(1+ β ·Δ t i )] (1)

[0049] In the formula: t e is the equivalent age, unit h, the same below;

[0050] T i for the first i hour and i −1 hour average te...

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Abstract

The invention belongs to the technical field of concrete, particularly relates to a method for measuring and calculating the actual strength of concrete on a construction site, and aims to provide a method for establishing a relationship between laboratory data and site construction environment data and quickly judging the structural strength of concrete on site. According to the method, influenceof the temperature on the equivalent age of the concrete is considered, and influence of the humidity is also considered; various factors influencing concrete strength in engineering are comprehensively considered, a strength coefficient database and a strength attenuation coefficient database are established respectively, then a new engineering field newly-allocated concrete strength predictionformula is established, and finally, component formwork removal time is reversely calculated, so that the predicted concrete strength data is more accurate. By establishing an effective relational expression between the actual concrete strength and the age, a simple and effective means for evaluating the concrete structural strength is provided.

Description

technical field [0001] The invention belongs to the technical field of concrete, in particular to a method for measuring and calculating the actual strength of concrete at a construction site. Background technique [0002] The strength evolution of concrete structures has an important influence on the construction process of high-rise and super high-rise buildings. The foundation floor is poured with mass concrete, and its temperature and strength evolution are closely related to structural crack control. The construction progress of the upper structure is relatively fast, and the demolition of the formwork and the climbing of the formwork require the concrete to reach a certain strength before proceeding. On the other hand, if the concrete strength cannot meet the design requirements, the structural safety cannot be guaranteed. Therefore, real-time monitoring and evaluation of concrete strength is of great significance to the construction of high-rise super high-rise buil...

Claims

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Application Information

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IPC IPC(8): G06F30/20G01N33/38
CPCG01N33/383
Inventor 龚剑朱然占羿箭徐俊王圣怡史晓婉
Owner SHANGHAI CONSTRUCTION GROUP
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