concrete order must include the amount of
concrete, cement type and supplementary cementing materials, necessary
slump at discharge point, coarse
aggregate maximum size, air content, mix proportions or exposure
class, admixture type, concrete temperature, concrete density,
and 28 day
compressive strength and/or ratio of water to cementing materials. The
ingredients for a concrete batch are measured by mass or
volume and added to the mixture. Most batchs
are measured by mass because of the volume inaccuracies of measuring
aggregates, especially wet sand. Concrete should be mixed
until it appears uniform and the contents are distributed evenly.
Concrete can be stationary mixed at the job site, ready
mixed and transported to the job site, continuously mixed as
ingredients are added to a job site Mobile Batcher Mixer truck,
and mixed by High Energy Mixers.
Materials In Concrete.
2.Concrete Aggregates - Concrete Slump.
3.Concrete Placement - Vibration - Hydration.
4.Types of Portland Cement - Concrete Moisture & Cracking.
5.Watertight Concrete - Supplementary Cementing Materials.
6.Supplementary Cementing Materials.
7.Chemicals That Damage Concrete.
8.Concrete Aggregate Properties.
9.Angular & Smooth Aggregate Properties.
12.Air Entraining Admixtures.
13.Air Entraining Admixtures Continued.
14.Conditions Affecting Concrete Air Volume.
15.Superplasticizers & Other Admixtures.
16.Ordering & Mixing Concrete.
17.Concrete Mixing - Subgrade Preparation.
18.Subbase Preparation - Concrete Placement.
22.Hot Weather Concreting.
23.Cold Weather Concreting.
24.Concrete Slump Test.