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CMGT 135 MIDTERM 1 1 00%EXAM VE WITRIFIEH CDOMPLETE!! SOLUTIONS
Aggregates -minerals mixed with portland cement and sand to form concrete. ANSWER>>Inert granules such as crushed stone, gravel, and expanded
What is the order of laying Aggregate Concrete (AC) and Aggregate Base (AG)? -ANSWER>>1. Aggregate Base (AG) 2.Aggregate Concrete (AC) What happens to soil when you excavate it? and then when you put it back? -ANSWER>>- Soil expands when excavates
- When put back it shrinks What is the best water to cement ratio? - ANSWER>>The lowest possible value. How long does it take for concrete to reach maximum strength? - ANSWER>>28 days What does building design start with? - ANSWER>>Space planning What would be a renewable resource? - ANSWER>>- Something that grows
- Trees not Concrete What is overall thermal performance of building assembly? - ANSWER>>Installation When does clay expand? - ANSWER>>When it gets wet
What is the most common type of footing? - ANSWER>>Continuous wall What are some different types of water that are in soil? -2. Gravity water ANSWER>>1. Capillary water
What is a Slurry wall? -an area to be excavated. ANSWER>>A wall built of a slurry used to hold up the sides of
What is Slurry? -cement. ANSWER>>A liquid mixture of water and bentonite clay or Portland
What is a Caisson? -carried out below the surface of water. ANSWER>>A watertight structure within which work can be
What is a passion foundation? -earth and filling them with concrete and reinforcing steel. ANSWER>>Foundations formed by drilling holes in the
what is Curing? -hydration occurs. ANSWER>>Protecting concrete after placing so that proper
what is a Cofferdam? -water-bearing soil or an area of water from which the liquid is removed (via pumping), ANSWER>>A temporary watertight enclosure around an area of allowing construction to take place in water-free area. What is Concrete? -cement, aggregates, sand, and water. ANSWER>>A solid, hard material produced by combining Portland
What is a Control joint? -structures to allow a place where cracking can occur, thus reducing he4 development ANSWER>>A groove formed in concrete or masonry of high stresses.
(True/False) Concrete poured in a wet footing trench is probably NOT at risk of settling. -ANSWER>>False
What is the relative mobility of a fresh mixture, in other words, its ability to flow. -ANSWER>>Consistency
What is the tendency of the coarse aggregate in concrete to separate from thesand-cement mortar? - ANSWER>>Segregation
(True/False) Compaction is the process by which the size of voids between soil particles isincreased. - ANSWER>>False
(True/False) Clays and Silty clay soils can be stabilized by mixing lime. - ANSWER>>True Name 3 types of foundations. -2. Spread ANSWER>>1. Continuous
- Matt Name 2 foundations that would support a pile. - ANSWER>>1. Spread
- Matt Soil made up of fine rock particles smaller than 1/4 in. (6.4 mm) and larger then 0.002 in.(0.05 mm) is classified as what? - ANSWER>>Sand
Rock particles larger than ____ in. are called cobbles or builders and are not classified
as soil. - ANSWER>>3in. ____ water is retained in the microscopic pores of the individual sand particles andenables them bind together. - ANSWER>>Capillary
____ is the ability of water to penetrate through the soil. - ANSWER>>Permeability ____ expand when they are wet, causing damage to concrete surfaces over them. -ANSWER>>Clays
In large commercial buildings, a part now as the ___ offers habitable space below grade.- ANSWER>>Substructure
____ foundations transfer the loads to the soil through the footings at the bottom of afoundation wall or column. - ANSWER>>Spread
The angle of repose for the slope of an excavation will range from 34 degrees forcohesion less soil to ____ for stable rock. - ANSWER>>90 degrees
A ____ is defined as a watertight shell in which construction is out below water. -ANSWER>>Cofferdams
A ____ is a temp. watertight enclosure built in water or water-bearing soil designed tokeep water and/or soil out of the excavation in which a bridge pier or other structure built. - ANSWER>>Cofferdam Name the 4 logical steps to designing a building. -architectural design ANSWER>>1. Architect provides
- Structural engineer designs the structure
- Specialty engineer design the building system
- Civil engineers design site requirements
- Screed concrete (remove excess concrete after placement)
- Float concrete (embeds aggregates, compacts surface)
- Finish concrete What is Troweling? - ANSWER>>Produces hard, dense, smooth surface. What is Edging? - ANSWER>>Round off edges of slab to prevent chipping. What is Brooming? - ANSWER>>Roughing the surface with a broom. What is Tilt-up wall construction? -on slab ANSWER>>- Wall cast horizontally near building or
- Bond release compound prevents adherence
- Cured wall panel positioned with crane One-Way flat slab - ANSWER>>- with cast-in-place joists and beams
- one- way slab supported by beams and girders or bearing wall(s)- a concrete slab in which the reinforcing steel runs perpendicular to the supporting beams, that is, one way. What do you do to concrete to make it easier to work? - ANSWER>>- less water
- keep it hot- keep it moving
Two-way flat slab -monolithically ANSWER>>- with cast-in-place joists and beams poured
- a reinforce concrete slab in which the main reinforcing runs in two directions, parallelto the length and width o the slab panel
Lift-slab construction - ANSWER>>- cast concrete slabs in stacks
- bond release compound prevents adherence
- slabs lifted by hydraulic jacks and then mounted What is Retarder? - ANSWER>>Delays setting time Name 5 types of soil - ANSWER>>1. Gravel
- Sand3. Silt
- Clay
- Organic matter Capillary water - ANSWER>>retained in pores of sand particles. Gravitational water - ANSWER>>flows between particles. Groundwater - ANSWER>>level of water below the surface
