Concrete strength evaluation method

A concrete strength and concrete technology, which is applied in the field of evaluating concrete strength, can solve problems such as limited use, poor operability, and complicated operation, and achieve the effects of improved feasibility, simple operation, and improved universality

Active Publication Date: 2011-02-16
SHANGHAI CONSTRUCTION GROUP
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Problems solved by technology

[0012] Generally speaking, the equivalent age method has improved the evaluation accuracy compared with the Sauer formula, but the operation is more complicated, and concrete and mortar test blocks need to be formed, and the setting time of the mortar at each c...

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Embodiment 1

[0045] The mass concrete of the base plate of a construction project is marked as C50, and the concrete mix ratio is shown in Table 1. The thickness of the bottom plate is 6m, the bottom surface and the top surface are circular, and the diameter is 12.5m. For construction in spring, the ambient temperature is 20°C, and the mold entry temperature is 15°C. The surface is covered with two layers of film and 2cm straw bags. Conduct temperature monitoring at a certain part of the central axis of the concrete floor to evaluate the strength of the concrete.

[0046] Table 1 Concrete mix ratio of bottom slab

[0047]

[0048] Note: The cement is ordinary Portland cement (PO) 42.5, the particle size of coarse aggregate is 5-25, and the admixture is RP325.

[0049] Figure 4 It is a flowchart of the steps of the method for evaluating the strength of concrete according to the present invention. Please refer to Figure 4 , the strength evaluation steps of concrete using this meth...

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Abstract

The invention provides a concrete strength evaluation method which comprises the following steps: fitting the relationship between the strength and the age of a concrete test cube under the standard curing condition; carrying temperature match curing on the concrete test cube by simulating the temperature procedure of construction site concrete, and actually measuring the actual strengths of the concrete at multiple test ages; calculating equivalent ages according to the test ages by combining assumed activation energy parameter values in the pilot calculation process, and substituting the equivalent ages into the fit relationship between the strength and the age to obtain calculated strength values; using a least square method to calculating the error between the actual strengths and thecalculated strengths, and carrying out regression analysis to obtain the activation energy parameter value which enables the error to be the minimum; and calculating the strength value of the construction site concrete based on the fit relationship according to the activation energy parameter value and temperature monitoring data of the construction site concrete. Strength evaluation in the method takes individual characteristics and operating environments of materials into account, thereby improving the universality.

Description

technical field [0001] The invention belongs to the field of concrete quality monitoring and relates to a method for evaluating concrete strength. Background technique [0002] At present, the on-site evaluation of the strength performance of concrete materials mainly adopts the same condition curing method. Due to the limited size of the test piece and the influence of human operation, the compressive strength of the concrete formed at the construction site is quite different from the actual strength of the concrete member. Especially for mass concrete, the maximum internal temperature of mass concrete can reach 60°C or even higher, and the high temperature lasts for a long time. Therefore, in the early stage of mass concrete hardening, the concrete is essentially a high-temperature hardening process, which is equivalent to a "quasi-steam curing" state. As far as the relationship between cement hydration rate and temperature is concerned, the higher the temperature, the f...

Claims

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Application Information

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IPC IPC(8): G01N33/38
Inventor 许永和廖晓敏周云鲁文嘉
Owner SHANGHAI CONSTRUCTION GROUP
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