Method for evaluating early-stage anti-freezing performance of concrete by drawing

Abstract

The invention relates to a method for evaluating the early-stage anti-freezing performance of concrete by drawing. The mechanical performance of concrete tends to decrease in winter construction due to influence of low temperature, especially, the concrete is frozen at subzero temperature; and freezing brings about additional intensity of the concrete, so that the mechanical performance of the concrete in the subzero temperature environment in winter construction is hard to master accurately, the progress of winter construction is influenced, the construction quality control is hard to ensure,intensity development of onsite concrete cannot be fed back accurately and timely, and further, it is more possible that there is risk in projects. A first concrete area and a second concrete area adjacent to the first concrete area are selected in a concrete project, temperature rise time Deltat for reaching a non-ice state of the first concrete area is obtained, the first concrete area is heated according to the temperature rise time Deltat, drawing test is carried out on the heated first concrete area and the unheated second concrete area, and the drawing force values are compared to evaluate the early-stage anti-freezing performance of the concrete. Thus, the anti-freezing performance of the concrete is evaluated.

Description

technical field [0001] The invention belongs to the field of concrete detection, and in particular relates to a method for evaluating the early freezing performance of concrete by drawing force. Background technique [0002] In my country, most areas such as Northeast, Northwest and North China have long and severe winters. The low temperature weather in winter will cause certain damage to concrete engineering, especially the concrete constructed in winter, the hydration rate is slowed down and it is extremely susceptible to freezing ice. After freezing, the porosity of concrete increases, the density decreases, the freezing pressure destroys the structure of hydration products, and the mechanical properties of concrete decrease significantly. Because the concrete surface is in direct contact with the negative temperature environment, the surface concrete cools down the fastest, and the temperature of the concrete decreases gradually from the outer layer to the inner layer....

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for evaluating the early freezing performance of concrete by pulling force, so as to solve the problem that it is difficult to timely and accurately evaluate the early freezing performance of negative temperature concrete due to the freezing of concrete during winter construction and the freezing damage of surface concrete is greater than that of internal concrete. Frost damage, resulting in poor quality of winter construction projects

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