Preparation of Composite Substrate for Foundation Reinforcement by Reconstructing Steel Slag at Room Temperature
A technology of foundation reinforcement and composite base material, applied in cement production and other directions, can solve problems such as inability to be directly applied in engineering, and achieve the effect of small increase in later strength, early strength improvement, and guarantee of project progress and safety.
Active Publication Date: 2016-09-21
SOUTHEAST UNIV
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Problems solved by technology
[0007] Technical problem: In view of the fact that the current steel slag reconstruction technology is a high-temperature reconstruction technology and cannot be directly applied in engineering, the active metakaolin is added to the steel slag, and an alkaline activator and an early-strength water reducer are added to it , to form a composite reconstructed base material, to complement the difference in chemical composition between steel slag and ordinary Portland cement, stimulate the potential gelation of steel slag, improve the overall utilization of steel slag, save energy and reduce carbon dioxide emissions
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[0018] The selected specific surface area is 300m 2 / g~500m 2 / g of steel slag, and test its chemical composition, use the test results to compare with the cement composition, add metakaolin and lime to it. When adding, the composition of the mixed material should be controlled to meet the requirements of the cement rate value. Control SM between 2 and 2.4; IM between 1.2 and 1.6, and KH between 0.9 and 0.94. The early-strength superplasticizer is SEU-type compound early-strength superplasticizer, and its proportion is shown in Table 2. The mixing amount of the early-strength superplasticizer is 2%.
[0019] Example: Select the steel slag after wet magnetic separation in Jiaxing area, and its chemical composition is listed in Table 1:
[0020] Table 1 Chemical composition of steel slag (mass fraction)
[0021] CaO
al 2 o 3
SiO 2
Fe 2 o 3
MgO
49.83～55.46
4.77～4.82
28.47～34.28
10.19～14.17
2.17～5.83
[0022] Table...
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Abstract
The invention is a new-style composite base material for reinforcing a foundation manufactured via reconstruction of steel slag at a normal temperature, belonging to the technical field of foundation processing in communication and transportation engineering and civil engineering; the new-style composite base material for reinforcing the foundation manufactured via the reconstruction of the steel slag at the normal temperature is characterized in that: metakaolin and slaked lime are added into the steel slag, and the control indices are respectively: SM is controlled to be between 2-2.4; IM is between 1.2-1.6, and KH is between 0.9-0.94, after the mixture is prepared, a sample is prepared according to water demand, and is put into a standard curing room, and the sample is prepared. After the steel slag is reconstructed according to the ratio of concrete, the ingredients of the steel slag are made up and supplemented, the strength is improved obviously on the basis of early strength, and the cost can be reduced greatly.
Description
technical field [0001] The invention is a new type of composite base material for foundation reinforcement prepared by reconstitution of steel slag at room temperature, and is a composite active base material that uses metakaolin, slaked lime, and a small amount of composite early-strength water reducer to activate steel slag at room temperature, and belongs to transportation engineering and civil engineering. The technical field of foundation treatment in engineering. Background technique [0002] As of 2012, the output of crude steel reached about 830 million tons, accounting for about 50% of the world's total output. At present, my country's steel slag production accounts for 15-20% of crude steel production, so about 100-150 million tons of steel slag is produced along with crude steel production every year. However, the utilization rate of steel slag in my country is less than 25%. Therefore, a large amount of steel slag is not utilized every year, which causes problem...
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IPC IPC(8): C04B7/17
CPCY02P40/10
Inventor 刘倩雯邓永锋顾兴宇刘松玉
Owner SOUTHEAST UNIV