Method for quickly evaluating the performance of tunnel hole slag suitable for preparing machine-made aggregate

Abstract

The invention relates to a method for quickly evaluating the performance of tunnel hole slag suitable for preparing machine-made aggregate, which comprises the following steps: 1) sampling: randomly selecting tunnel hole slag of different tunnel faces in the same section, ensuring that the shapes of the selected tunnel hole slag are basically consistent, and weighing the initial mass of the tunnelhole slag; 2) transporting: transporting the tunnel slag to a test site by using a carrying tool; (3) testing: enabling the tunnel hole slag to freely fall off from a certain height and fall onto a solid laid hard platform, enabling the falling hole slag to pass through a screen with a certain aperture, screening out particles of which the particle sizes are smaller than the sizes of screen holes, and weighing the mass of the hole slag on the screen; and 4) data processing and evaluation: quickly evaluating the mother rock performance of the tunnel hole slag in the same potential energy rangeby calculating the breaking index, and quickly sorting the hole slag meeting the performance requirements as the raw material of the machine-made aggregate. Compared with the prior art, the method has the advantages of simple operation, accurate test, advancement, quickness, suitability for fields and the like.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a method for quickly evaluating the properties of tunnel slag suitable for preparing machine-made aggregates. Background technique [0002] With the steady advancement of engineering development strategies in my country's construction field, major projects such as highways and railways have developed rapidly. However, due to the limited mining of river sand resources and seasonal influences, there is a serious shortage of river sand raw materials for concrete that meet the requirements. Especially in mountainous areas dominated by Sichuan and Sichuan. This not only causes unstable quality of raw materials and rising prices, but also affects the construction period of the project. In severe cases, it leads to insufficient durability and quality of the project, which affects the service performance and service life of the project. The application of machine-made sand is ...

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Problems solved by technology

[0004]However, there are certain problems in the above two methods. Although the compressive strength of parent rock can well represent the compressive strength of rock and mine parent rock, it is not suitable for The compressive strength of the tunnel slag parent rock is tested. This is mainly due to the irregular shape of the tunnel slag and the difficulty of core sampling. At the same time, the entire test process is cumbersome and the cycle is long; although the crushing index is tested quickly, it needs the parent rock to be broken. The test can only be carried out after the production of coarse aggregate, so it is not possible to evaluate the strength of the parent rock before the aggregate is processed.

In addition, tunnel slag has the characteristics of large amount and low strength, so it is necessary to quickly evaluate the aggregate of tunnel slag preparation mechanism to reduce unnecessary workload, but there are few reports on the rapid evaluation method of tunnel slag

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