Experimental Study On The Impacts Of Granite Powder And Fly Ash On The Properties Of Concrete

There are large amounts of stone resources in our country. The solid wastage producedin the process of mining and processing stone, namely granite stone powder and chips are notrationally utilized that results in severe environment contamination. For effectively utilizinggranite stone powder resources in hydraulic engineering and construction engineering, thisarticle analyses basic physical properties of granite stone powder by the basic theory for theconcrete materials and physical test methods, and systematically studies the influence ofdifferent proportions of granite stone powder on the concrete working performance, thecompressive properties, the anti-permeability and freezing-thawing resisting performance, atthe same time obtains the optimal proportion of granite stone powder in concrete incomparison with fly ash concrete. It also tests the alkali content and chlorine ion content ingranite stone powder concrete with the optimal proportion. Finally, it obtains different mixingratios of concrete mixed with granite stone powder suitable for different working conditionrequirements by mixing and adjusting granite stone powder mixture. It is elaborated asfollowed:1. The incorporation of granite stone powder can significantly improve workingperformance of concrete, and the mixing of granite stone powder in concrete can increasefresh concrete’s slump. When the granite stone powder content is10%of cement content, thestrength of early concrete is1.1MPa larger than that of ordinary concrete; when the granitestone powder content is less than20%, the compressive strength of the concrete at28thday isclose to that of ordinary concrete; Mixing rational amount of granite stone powder canobviously improve the anti-permeability of concrete. That is to say that when the granite stonepowder content is10%of cement, the anti-permeability is preferably, however, with theincrease of content the anti-permeability deteriorates. When the granite stone powder contentis10%and20%of the cement, the frost resistance is close to the control, the anti-freeze level can reach F300.2. When the low quality fly ash content is10%of concrete, it plays the positive role inthe fluidity of concrete; however with the increment of content it plays the negative part in thefluidity performance. When the fly ash content is20%of cement content, the compressivestrength of concrete at28thday is close to the control group. The fly ash is detrimental to thestrength of the early concrete, while late strength is well developed. When the fly ash contentis10%, the concrete anti-permeability is better than the control group. The frost resistancedegrades with the increment of the fly ash.3. When the granite stone powder content is10%or20%of the cement, the alkalicontent and chlorine ion content in concrete are less than reference group, meeting the highestrequirements in the relevant national norms about the alkali content and chlorine ion contentin practical engineering.4. The particle size of granite stone powder is finer than that of cement, and it isuniformly distributed. As cement product’s admixture, granite stone powder can refinecement product’s pore structure. It can meet the requirements for hydraulic concreteworkability and strength in all kinds of construction condition by adjusting grout powdercontent, water-cement ratio and water reducing agent dose.This project explores a fresh approach to the utilization of granite stone powder，whichcan effectively resolve the environment contamination problem of granite stone powder andpresent a new type of concrete with better performance. Consequently, as concrete mixturethe granite stone powder has great market potential and economic, social and ecologicalsignificance.