Method for obtaining change condition of aggregate-mortar bonding strength in concrete

Abstract

The invention discloses a method for obtaining a change condition of aggregate-mortar bonding strength in concrete. The method comprises the following steps of step (1), carrying out splitting tensilestrength test on a concrete test piece; step (2), acquiring an image of one splitting surface; step (3), counting a splitting aggregate and a desizing aggregate in the splitting surface image, and calculating the area of the splitting aggregate and the desizing aggregate; step (4), calculating the proportion of the area of the splitting aggregate and the areas of all aggregates; and step (5), fitting a relation between the proportion of the splitting aggregate and the splitting tensile strength, and therefore obtaining the change condition of the aggregate-mortar interface strength. The method for obtaining the change condition of the aggregate-mortar bonding strength in the concrete provided by the invention is reasonable in design and convenient to operate, provides a reference basis for obtaining the change condition of the concrete aggregate-mortar interface strength by using a low-cost technical means, and the reference basis is combined with the utilization of the statistics andcan be completely self-corrected, so as to finally form a guide standard in the industry. Therefore, the method provided by the invention well achieves the balance between technology and cost, and isvery suitable for large-scale popularization and application.

Description

technical field [0001] The invention relates to the technical field of concrete research, in particular to a method for obtaining the variation of aggregate-mortar bond strength in concrete. Background technique [0002] Concrete is a widely used building material, which has the advantages of high economy, strong plasticity, and local materials. Concrete is mainly composed of cement clinker, fine aggregate, coarse aggregate, water and other additives. Under the action of water, the cement clinker undergoes a hydration reaction to form a grid structure, and the coarse aggregate and fine aggregate are bonded together to form a particle-reinforced composite material. The interface bond between aggregate and mortar is called the interface transition zone, where there are often many defects (such as calcium hydroxide enrichment), and the strength is low, such as figure 1 shown. [0003] It can be seen that the strength of concrete depends on the bond strength of the aggregate-...

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Problems solved by technology

[0004] However, since most of the concrete aggregates are natural crushed stones or pebbles, which have a variety of compositions and are limited by geometric shapes, it is difficult to clamp them. Therefore, the existing technical means cannot effectively obtain the change in the bond strength of the aggregate-mortar interface. Happening

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