Cement stable regeneration aggregate gravel proportioning design method

Abstract

The invention discloses a cement stable regeneration aggregate gravel proportioning design method, which comprises the following steps of (1) determining the mineral aggregate grading range; (2) setting a plurality of cement and water consumptions; respectively preparing cement regeneration aggregate gravel mixed materials; (3) shaping the cement stable regeneration aggregate gravel mixed materials obtained in the step (2) by a rotating compression method; using the accumulated height change being smaller than 1mm after the continuous 10 times of compression as a stopping standard; obtaining a relevant curve between the mixed material water content and the density; analyzing the curve to obtain the optimum water content and the maximum dry density of the mixed materials; (4) manufacturing a sample in the optimum water content and maximum dry density state; performing 7-day no-lateral-restraint pressure resistant intensity tests on a test specimen; determining the proportioning ratio of the cement stable regeneration aggregate gravel. The method has the advantages that the stress state of the material during the semi-rigid base layer construction can be better simulated; the design result can be used for better guiding the field construction.

Description

technical field [0001] The invention relates to a method for designing the proportion of cement-stabilized gravel, in particular to a method for designing the proportion of cement-stabilized recycled aggregate gravel. Background technique [0002] With the further development of urbanization in our country, a large number of construction wastes have been brought in the old city renovation project. The treatment of these construction wastes has become a difficult problem in major cities in our country. In recent years, my country has gradually attached importance to the green and sustainable development of society, such as the recycling of building materials, which helps to save national resources. However, our country started late in this field, although many policies have been introduced in the utilization of recycled aggregates from construction waste, and application technical regulations in the construction field have been compiled. However, since architectural recycled...

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Problems solved by technology

With the replacement of construction machinery and the advancement of on-site compaction technology, this test piece forming method can no longer be used to guide modern road construction

The heavy-duty compaction test method cannot simulate the on-site compaction mechanism. This experiment is to compact the material to be compacted by applying an impact load to the instrument. The oblique shear force and vibration of the road roller

[0006] Second, the 7d unconfined compression test in the traditional design method adopts the static pressure method to form the specimen. The volume characteristics of the specimen are quite different from the on-site wheel-rolling construction method, and its strength index is difficult to simulate the final on-site compression. real state

[0007] Third, the traditional design method has large errors when carrying out compaction tests and static pressure tests

, In addition, factors such as the quality of layered materials will vary with different testers, and even the test results done by the same tester at different times will be quite different, resulting in poor test reproducibility, discrete test results, and existence of instability

[0008] At the same time, recycled aggregates have the characteristics of high water absorption and low strength. Using conventional compaction design methods will lead to excessive water content in semi-rigid materials, making semi-rigid materials more prone to shrinkage and cracking. Therefore, traditional compaction The mix ratio design method combining molding and static pressure molding is no longer suitable for this kind of material

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