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Aggregates for Concrete
Rounded gravel left and crushed stone right. Rock and Mineral Constituents in Aggregates. Expanded clay left and expanded shale right. ACI R presents additional test methods and properties of concrete influenced by aggregate characteristics.
Aggregates for Concrete – ppt video online download
When different sizes are combined, the void-content decreases. The illustration is not to scale. The specified sieves are: The FM is an ast of the fineness of the aggregate. Different aggregate grading may have the same FM. Less cement and water are required in mixtures having large coarse aggregate Bureau of Reclamation Granite, limestone and quartz, are low shrinkage-producing aggregates ACI R.
Some Potentially Harmful Reactive Minerals, Rock, and Synthetic Materials Several of the rocks listed granite gneiss and certain quartz formations for example react very slowly and may not show evidence of any harmful degree of reactivity until the concrete is c124 20 years old. Only certain sources of these materials have shown reactivity. Cracking of concrete from alkali-silica reactivity. Inset shows closeup of a popout.
Fig Polished section view of an alkali reactive aggregate in concrete. Observe the alkali-silica reaction rim around the reactive aggregate and the crack formation. Kerkhoff and Siebel Objectives aetm Lecture To explain the sources of aggregates used for making concrete. Earth science Rock cycle, Igneous rocks. My presentations Profile Feedback Log out. Auth with social network: Registration Forgot your password? Download ppt “Aggregates for Concrete”.
Aggregate Composition and Grading. Aggregate Uses Rock like material that has many Civil Engineering applications: Road bases and fills PCC:.