A method of using a quantitative determination device for the saturated surface dry state of fine aggregates

Abstract

The invention discloses a device and method for quantitatively determining the dry state of a fine aggregate saturated surface, which is characterized in that it comprises two backboards, a funnel and a platform; the two backboards intersect vertically, and the intersection line is vertical; The funnel is fixedly connected above the two backboards, and the spout is arranged at the intersection of the two backboards; the platform and the bottom surface of the backboards are horizontally arranged at a certain distance from the bottom of the backboards. The lower part is used to accept the fine aggregate freely falling from the leak nozzle, the two sides of the platform are respectively fixedly connected with the two backboards, and the center of the circle is located on the intersection line of the two backboards; from the The fine aggregate funneled onto the cap gradually forms a quarter-cone, the height of the quarter-cone is measured when the radius of the quarter-cone is equal to the radius of the cap , and use this to quantitatively characterize the surface state of the fine aggregate at this time, and then judge whether the fine aggregate is in a saturated surface-dry state.

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 (JTG E42-2005), 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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