What Is The Chemical Reactivity Of Granite
The streak of granite is white whereas its fracture is not available.
What is the chemical reactivity of granite. It is one of the oldest and most durable building products available and will far outlast the building in which it is installed. Granite has been used as a building material since ancient times. Granite rubble is one of the most frequently used aggregates in concrete manufacturing. Chemical weathering of granite occurs when dilute carbonic acid and other acids present in rain and soil waters alter feldspar in a process called hydrolysis.
Granite rubble is considered to be a non reactive aggregate however depending on the quarry granite may have various impurities including harmful minerals containing active sio 2 the alkali silica reaction is among the chemical reactions that have a significant effect on the durability of. Without specific instruction many students would not be able to predict whether a chemical reaction should be seen or not. I do this reaction on a hot plate atmospheric pressure. Granite is the most common intrusive rock in earth s continental crust it is familiar as a mottled pink white gray and black ornamental stone it is coarse to medium grained.
As granite is composed of a number of minerals this acid test should reveal whether or not significant calcite is present in this rock. Its three main minerals are feldspar quartz and mica which occur as silvery muscovite or dark biotite or both. Luster of granite is the interaction of light with the surface of granite. Granite rubble is considered to be a non reactive aggregate however depending on the quarry granite may have various impurities including harmful minerals containing active sio 2.
There is no one chemical formula for granite. Granite is mostly alkali feldspar and quartz with other minerals being accessories or accidentals. Granite in particular is a tricky digestion because you are digesting a lot of silica a lot of alumina and. Granite is a common coarse grained hard igneous rock consisting chiefly of quartz orthoclase or microcline and mica.
14 15 as demonstrated in the following reaction this causes potassium feldspar to form kaolinite with potassium ions bicarbonate and silica in solution as byproducts. Kovler in toxicity of building materials 2012. The hardness of granite is 6 7 whereas its compressive strength is 175 00 n mm 2. It is a pretty nasty digestion but necessary for a lot of geochemistry research.
The longer the granite is exposed to these types of substances the more severe the etching and the more in depth the repair process. Streak is the color of rock when it is crushed or powdered. Good example of experimental science to determine an answer by.