Road base material produced by stabilizing waste concrete construction waste aggregate with lime red mud

Abstract

The invention discloses a road base material for stabilizing waste concrete construction waste aggregate with lime red mud, and belongs to the field of road engineering. Lime and red mud are used as inorganic binding materials, and the waste concrete construction waste aggregate is used as a stabilized material. A dry mixture comprises the components in percentage by weight: 3%-5% of lime, 12% ofred mud and 83-85% of waste concrete recycled aggregate. By adding water for mixing, the optimal water content of the compacted wet mixture is 11.92%-12.58%, and the maximum dry density of the compacted wet mixture is 1.963 g / cm<3>-1.982 g / cm<3>. The 7 d unconfined compressive strength of the base layer material is 1.16-2.46 MPa, the coefficient of variation is 6.7%-8.6%, and the 56 d total dry shrinkage strain is 0.078%-0.091%. Construction waste is fully recycled, use of natural gravel and lime is reduced, waste recycling is facilitated, and the problems of non-renewable resource shortage and environmental pollution are relieved.

Description

technical field [0001] The invention relates to the field of road engineering, in particular to a method for preparing a road base material produced by using lime red mud to stabilize waste concrete construction waste aggregates. Background technique [0002] At the beginning of the 21st century, China entered the stage of heavy chemical industry. Since then, some heavily polluting industries have developed rapidly, resulting in a sharp increase in the production of industrial pollutants. The pollution problem is becoming more and more serious, and the difficulty of governance has increased. "Red mud", also known as "red mud", is the industrial waste residue after alkaline treatment of bauxite in alumina factories. Because it contains more iron oxide components, it appears red. The annual discharge of red mud in my country is about 20-30 million tons, which is one of the solid wastes with the largest discharge in my country's current industrial production. The large-scale a...

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Problems solved by technology

[0004] In addition, natural crushed stone has always been an indispensable aggregate in the construction of infrastructure such as housing construction, roads and bridges. At present, the main source of crushed stone in the construction market is the crushed stone that was blasted from the mountain. The mining of crushed stone usually requires the use of Mining from the mountain by blasting, such excessive mining of rocks not only destroys the natural landscape of the mountain, but also causes serious water and soil erosion. As a non-renewable resource, natural gravel is no longer suitable for continued excessive mining. It is urgent to find another material to replace it.

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