Cement-stabilized base material and design method thereof

Abstract

The invention discloses a cement-stabilized base material and a design method thereof. The cement-stabilized base material is prepared from the following ingredients in percentage by weight: 31.5% to58.4% of coal gangue fines, 31.5% to 58.6% of limestone aggregates, 4.1% to 5.4% of cement and the balance of water. The design method comprises the following steps: 1) carrying out chemical and physical mechanical testing on a coal gangue sample so as to remove the risk of harmful impurities; 2) mixing the coal gangue fines with the limestone aggregates for gradation composition design under theprinciple of maximizing the application of the coal gangue fines; 3) selecting a plurality of cement doses, and carrying out compaction testing; 4) determining a cement dose by 7d unconfined compression strength; 5) verifying the composition scheme of the material through cleavage strength testing, and returning to the step 2) if the composition scheme is not met. Compared with full-aggregate-replaced materials, the cement-stabilized base material has the advantages that the coal gangue fines are used for carrying out partial substitution, the strength index can reach base layer standards, resources are saved, the environment is protected, and the cost of the base material is greatly reduced.

Description

technical field [0001] The invention relates to a cement stabilized base material and a design method thereof, belonging to the technical field of civil engineering (road engineering). Background technique [0002] With the rapid development of the national economy, the mileage of my country's traffic continues to increase. Now, my country has made great achievements in the construction of expressways. By the end of 2013, the total mileage of highway construction in my country surpassed that of the United States, ranking first in the world; [0003] However, in recent years, the quality requirements of road materials in highway engineering have been continuously improved, and the consumption has also been increasing. Only relying on excavating rocks to meet the huge demand, not only the work intensity is high, but a lot of manpower and material resources are wasted. At the same time, the mining of stones will cause serious damage. Destruction of the ecological environment; my...

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Problems solved by technology

[0003] However, in recent years, the quality requirements of road materials in highway engineering have been continuously improved, and the consumption has also been increasing. Only relying on excavating rocks to meet the huge demand, not only the work intensity is high, but a lot of manpower and material resources are wasted. At the same time, the mining of stones will cause serious damage. Destruction of the ecological environment; my country's highway construction, management and maintenance all emphasize environmental protection and sustainable development, and are consistent with the development requirements of the market economy, and the economic and social benefits of highway investment are increasingly demanding

[0004] Coal gangue is the most discharged and stockpiled industrial solid waste. At present, most of the coal gangue discharged from the process of coal mining and washing at home and abroad is disposed of in ravines and plains for long-term stacking. The annual discharge of coal gangue in my country and The accumulation of coal gangue over the years is huge, and the consumption of existing coal gangue utilization methods is small, resulting in the current utilization rate of coal gangue being less than 30%. The accumulation of coal gangue not only occupies a large amount of cultivated land, but also pollutes the environment. It can be used with building materials and play its role, which can change the energy consumption structure of our country and make full use of its economic and social benefits.

The quality of coal gangue itself is related to the origin of coal gangue. The physical and mechanical properties of coal gangue from different origins are quite different. If coal gangue with a certain gradation is directly used to replace aggregates and stabilized with inorganic stabilizing materials, its performance indicators are poor. The application of coal gangue materials as road base road construction materials will be restricted; coal gangue will be crushed and graded according to its particle size distribution, and the use of inorganic binders for cementing and stabilizing the base layer through gradation composition design will greatly reduce the cost of coal gangue raw materials. Physical and mechanical properties and processing technology have strict requirements, which also limit the use of coal gangue materials as road base materials

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