50411 Construction Materials Option 9

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Uploaded: 09.03.2013
Content: 30309175436733.rar (21,43 kB)
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Description

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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