Quantitative determining device for saturated surface dry state of fine aggregates and method thereof

Abstract

The invention discloses a quantitative determining device for the saturated surface dry state of fine aggregates and a method thereof. The quantitative determining device is characterized by comprising two back plates, a hopper and a bearing platform. The two back plates are vertically intersected, and the intersection line is vertical. The hopper is fixedly connected with the upper portions of the two back plates. A discharge spout is arranged on the intersection line of the two back plates. The bearing platform is horizontally arranged on the lower portions of the back plates in the mode of being spaced from the bottom faces of the back plates by a certain distance and used for bearing the fine aggregates freely dripping from the discharge spout. The two edges of the bearing platform are fixedly connected with the two back plates respectively, and the circle center is located on the intersection line of the two back plates. The fine aggregates dripping onto the bearing platform from the hopper form a quarter cone gradually, when the radius of the quarter cone is equal to the radius of the bearing platform, the height of the quarter cone is measured, accordingly, the surface state of the fine aggregates at the moment can be represented quantitatively, and then whether the fine aggregates are in the saturated surface dry state is judged.

Description

technical field [0001] The invention belongs to the field of civil engineering, and in particular relates to a device and method for quantitatively determining the saturated surface dry state of fine aggregate. Background technique [0002] The determination of the saturated surface-dry state of fine aggregate has always been a difficult problem in the field of civil engineering. The saturated surface dry state of the aggregate refers to the state in which the inside of the aggregate is saturated with water and the surface is dry. In engineering, due to the water absorption of aggregates, it is necessary to evaluate the water absorption performance of aggregates, and the water absorption of aggregates is generally characterized by the water absorption rate of aggregates. The percentage of moisture absorbed in the dry state to the dry aggregate mass, so the determination of the dry state of the saturated surface of the aggregate is very important for the evaluation of the wa...

AI Technical Summary

Problems solved by technology

Different testers usually have different judgments on saturated surface dryness; and as the types of aggregates used in projects become more and more abundant, for example, for recycled aggregates such as recycled brick powder and recycled concrete, the above-mentioned "Highway Engineering Aggregate Test There will be large errors in determining the standards for natural sand or machine-made sand stipulated in the Regulations (JTGE42-2005), and it is too cumbersome to formulate different judgment standards for different fine aggregates one by one.

[0004] It can be seen that this method has great limitations. When determining the state of saturated surface dryness, there is no reliable quantitative judgment index, and it relies heavily on human subjective judgment. Therefore, the reproducibility of the experiment is poor, and it is seriously affected by human factors. , and due to the single judgment index, it cannot be well applied to different types of fine aggregates

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