50411 Construction Materials Option 9

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Uploaded: 09.03.2013
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1. Minerals, provide natural stone increased strength on impact load, the properties of these minerals
2. Production and processing of rocks
3. Differences in the clay brick production technology methods and semi-plastic molding
4. Gypsum binders: technology of cooking and autoclaving, the dependence of the properties of the gypsum from the method of preparation
5. Advantages of ground lime, quicklime to slaked lime
Objective 1
How many times the porosity of the rock A different porosity in stone, if it is known that the true density of the solid rock of both is almost the same and is 2.72 g / cm3? Average density of stone A 20% more than in the stone, which has water absorption volume is 1.8 times more by weight water absorption.
Task 2
Determine flow clay by weight and volume, for the manufacture of bricks 250, having an average density - 1780 kg / m3. The average density of the crude clay - 1610 kg / m3 (at 13% humidity). Loss bricks by weight upon firing of 8.5% by weight of dry clay.
Objective 3
Determine a nominal composition (by volume) and material consumption per 1 m3 dense concrete if its nominal composition by weight of 1: 2.2: 5.1 at B / C - 0.7. Take in the calculations that the materials are dry and have the following densities in the state pours sand - 1600, gravel - and cement 1450 - 1300 kg / m3. The exit rate must be set.


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