Test 3 CIM 310

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54 Terms

1
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Advantage of Central Mix Plant

Higher Production Rates

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Plant operator responsible for:

Loading mixer and controlling discharge

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4 element of wet plant operation

Charging Time, Mixing Time, Discharge Time, Return Time

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Typical Mixing time for 10 yd3

2 min

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plant equipment which gives it ability to blend ingendients before entry into mixer

efficient mixing

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Fluid and consistent mixes provide

faster discharge

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Central Batch Plants are capable to

start next batch while discharging

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Slump affects amperage needeed to mix, higher amperage means

stiffer concrete

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types of mixers

horizontal and tilt up

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standand equipment, most part and pieces can be maintained by plant operators

In-house maintenance

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maintenence for Batching Control Panel, electrical equipment

Specialized maintenence

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tool to keep track of several activities in the daily operation and control of the batch plant.

daily plant log

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Basis of strength in concrete

W/C ratio

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Admixtures for concrete are

Chemical and Mineral

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Concrete achieves ___% of untilate compressive strength in 7 days

65-75

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what percentage does the paste represent in the concrete mixture

20-40

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A mixture in a freshly harded state, delivered to the site is

Ready Mix Concrete

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High Profile Bacthes have components:

above ground level

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Whats is the difference between wet-batch plants and dry-batch plants

The Mixer

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Liquid advixture dosage is in:

floz/yd3

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minimum concrete temprature of concrete mixtures in cold weather is:

50F

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Batch plant mixers can be grouped in:

Tilt and horizontal mixers

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non-agitating trucks are used for:

short haul projects

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10yd3 concrete buckets are helpful for:

high elevation

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concrete mictures made a mobil truck mixer is commonly:

Volume based

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Common concrete barrel size in NJ is:

4-12 yd3

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production, delivery and placecmnt of ready mix concrete is based on:

ASTM C-94

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Scale that has a counter weight

Scale Lever

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Scale that is electronic

Single Load

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Scale that has no moving parts

Four Point

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In batching, Cement should be weighed:

First

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In batching Pozzolans should be batched:

Second

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water batching can be done by:

Volume and Weight

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loading method which blends fine and coarse and cememt before

Ribbon Batching

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Loading method where trucks get aggregate, water and admixtures; thenthey move to the next station to get the cement

Dry Batching

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How many types of batch plants are usually considered

Wet and Dry

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Performance and Prescription basis are _____ and ____ to order conrete

options and criteria

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easiest way to increase temp of concrete is

heating water

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concrete batch plant is the equipment where ________ is manufactured

ready mix concrete

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configuration of batch plant based on

Location of components and high or low

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W/c ratio, unit wieght, slump are

characteristics of concrete mixture

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formula for absolute volume of material

weight of material/(spec grav x density of water)

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tail water is ___%

15-30

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What has a greatest impact on batching process

Aggregate moisture

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Tolenances and calibration governed by

Concrete Plant Manufactures Bureau

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Which condition is more expensive to solve in batching

Overweight

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Checking weather forecast and air compressors are part of activities included in the ____

activities, daily checklist

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aeration of cement silos when air pressure is applied at ___ psi

0.5-5

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Typical batching tolerances for cement, aggregate, water, admixtures

0.3 of scale capacity, 1211 required weight

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Bulk density varies from ________ lbs/ft3depending on degree of aeration

60-94

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What 2 conditions slow down the batching-discharge process and increase the potential errors and batch accuracy?

Vacuum and Pressure

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How much water is allowed to continue into mixing time

up to 25%

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factors affecting truck ability to accept material

mixer design, drum opening size, rotational speed, slump

54
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types of aggregate moisture

Free, SSD, Absorbed