please don\'t take the answer, or copy it it should be simple. The map should he
ID: 1765543 • Letter: P
Question
please don't take the answer, or copy it
it should be simple. The map should help you with the answer
thanks
Explanation / Answer
4.9 : C/B ratio also called as saturation coefficient, is an indicator of resistance of a brick towards freezing and thawing. It is denoted as the ratio of the weight of cold water absorption to that of the hot water absorption. The procedure to find C/B ratio is well described in ASTM C 67 (Standard method of sampling and testing brick and structural clay tile). The C/B ratio is generally less than, which means lower absorption of brick.
C/B ratio indicates the void ratio or porosity in the brick i.e more the C/B ratio more will be the voids in the brick. This ratio also affects the strength the of the brick, compressive strength increases as the C/B ratio decreases. According to ASTM C 62 the following are the compressive strength of different the C/B ratio.
This depicts the significance if C/B ratio in the material property of the brick.
4.10 As the northeastern coast of North America is subjected to severe weathering and southern California is a negligible weathering zone, the brick or block to be used in veneer construction will be in accordance to the susceptibility of the brick/block to the weather conditions as per ASTM.
As per American Standard Building Code Requirements of Masonry - Miscellaneous Publication -M174 there are several following materials that can be used :
1. Solid masonry unit (Clay or Shale): As per ASTM C62-41 MW grade brick can be subjected to weathering but nor frost hence this type can be used in southern California. Moreover, SW grade brick can be used in the northeastern coast as it can be subjected to weathering and frost. However, NW grade brick, since cannot be subjected to weathering and frost can be used for the interiors. However, these bricks do not have an attractive appearance and need to be plastered or rendered.
2. Sand Lime bricks: These bricks are made by a chemical process during wet mixing of sand, flyash, and lime. As per ASTM C 73-39 MW grade brick can be used in the southern part due to less extreme weather conditions and SW grade for the northeastern parts and NW for the interiors. Moreover, these bricks offer an advantage over solid masonry units as they are smooth and do not require plastering and have more compressive strength, hence can act as a load bearing member. Hence this brick will be more preferred over solid masonry unit.
3.Concrete brick:As per ASTM C 55-33 Grade A brick to the northeastern parts and Grade B to the southern parts. They are much superior than the above two stated bricks in comparison with the compressive strength and also are very common among homebuilders. Aesthetically they are much excellent.
4.Structural Clay Tile: As per ASTM C34-41 LBX grade can be used for the northeastern parts and LB for Southern parts.
5 Concrete Masonry units
6 Natural Stone
7 Terra Cotta
4.11 The brick/ block can be considered as an isotropic material as the material properties of it does not change with direction.
Designation Compressive Strength (psi) C/B ratio Grade SW 3000 0.78 Grade MW 2500 0.88 Grade NW 1500 No limitRelated Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.