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Limestone is commonly white to gray in color. Limestone that is unusually rich in organic matter can be almost black in color, while traces of iron or manganese can give limestone an off-white to yellow to red color. The density of limestone depends on its porosity, which varies from 0.1% for the densest limestone to 40% for chalk. The density correspondingly ranges from 1.5 to 2.7 g/cm3. Although relatively soft, with a Mohs hardness of 2 to 4, dense limestone can have a crushing strength of up to 180 MPa.[12] For comparison, concrete typically has a crushing strength of about 40 MPa.[13]

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Medium-high magnification, plain transmitted light image of part of concrete displaying a coarse latite aggregate (upper right) showing a crack along its edge intersecting an air bubble, the crack then passing through cement matrix and running along around edges of a quartz gran. Note the radial needles of ettringite lining the air bubble. Field of view is 0.3mm

While both codes and standards specify grout slumps in excess of 8 in. (203 mm), there may be certain conditions where lower slumps could be used or may be warranted. For example, if the concrete masonry units are low absorptive units or if the grout spaces are large and the grout lifts are short, lower water content grouts may work fine although care should be taken to assure adequate filling around reinforcement or other obstructions. Likewise, cold weather could present conditions where lower water content grout would be advantageous under certain circumstances (i.e. freezing conditions), but not as a general rule. For demonstrating the suitability of alternate grouting means and/or methods, the grout demonstration panel option detailed in Specification for Masonry Structures (ref. 7) should be used to qualify the proposed method. See NCMA TEK 3-2A (ref. 1) for information on grout demonstration panels

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Welcome to The Global Cement Report - online database of cement plants. This resource contains listings of over 2557 facilities worldwide (excluding China), and is the most up-to-date listing of cement plant information available. Basic data is available free of

cement manufacturing process. Article 2, Paragraph 11 defines best available techniques. Each of the words best, available and techniques is defined and reference is made to Annex IV of the Directive. The definition of available is of particular importance Get price

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