- 期刊
Mix Design Method for Permeable Base of Porous Concrete
並列摘要
As a new material type for permeable base, porous concrete should be designed to maintain both porosity and the structural strength. Based on Talbot's formula and experience, four gradation compositions of porous concrete are designed with consideration of effective particle size and uniform coefficient as effective descriptive targets for the aggregate gradation. Three factors, including cement dosage, water cement ratio and aggregate gradation, are considered in an orthogonal test. Statistical variance analysis of the tests results showed that, at a confidence probability of 95%, the factors that significantly influence the 7-day compressive strength are gradation and cement aggregate ratio while the factor that significantly influences effective porosity at the same confidence probability is the cement aggregate ratio. In addition, when the confidence probability is 90%, gradation, cement dose and water cement ratio all have significant influence on the 7-day compressive strength and the effective porosity. Based on the test results, a series of regression relationships of 7-day compressive strength and effective porosity of porous concrete are derived. Finally, an empirical equation for mixture design of porous concrete is proposed.
延伸閱讀
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