If you are talking about shrinkage, then quite a bit. To make concrete, cement and water react together. There is a specific amount of water required to hydrate the concrete. Any water extra must leave the concrete and while it makes the concrete more workable, hurts the concrete is several ways. The volume of the concrete will change by whatever excess water you have added. To get workability, it's always best to use a water reducing admixture.
Because the cement will damage
As pozzolan greatly improves the strength and durability of concrete, the use of ash is a key factor in their preservation and add to the concrete's final strength and increase its chemical resistance and durability.It can also increase workability of cement while reducing water demand. The replacement of Portland cement with fly ash also reduces the greenhouse gas foot print of concrete, as the production of one ton of Portland cement produces approximately one ton of CO2. Since the worldwide production of Portland cement is expected to reach nearly 2 billion tons by 2010, replacement of 30% of this amount by fly ash could dramatically reduce global carbon emissions.
A dry environment is the most important factor when storing cement. yes, yes i think that the guy who wrote the answer above is corredt :) X X X
-Re-inforced cement concrete -High temperature services
The Deepwater Horizon rig caught fire due to the uncontrollable flow of hydrocarbons (blow out) to the rig floor. There were a number of explosions on the rig, with the first explosions coming from the engine room, as the engines went out of control (reved at a high speed). Later explosions were most likely the result of large supplies of fuel onboard the rig. The rig ultimately sank as a result of the fire and explosions. The causes continue to be investigated. However, one critical factor for the blow out is likely to be the foamed cement used to cement in the final casing. Laboratory analysis has shown the cement formulation was unstable in some of the tests. Another factor is the failure of blow out preventers to close. See related link.
The Compacting Factor = Weight of partially compacted concrete/Weight of fully compacted concrete.The weight of fully compacted concrete can also be calculated by knowing the proportion of materials, their respective specific gravities, and the volume of the cylinder.It is seen from experience, that it makes very little difference in compacting factor value, whether the weight of fully compacted concrete is calculated theoretically or found out actually after100 per cent compaction.
compaction factor test is better than slump test,because compaction factor test should have own compaction wight,so correct value will be find out from compaction factor test.........
Choose the grade of concrete & assume minimum water/cement ratio.Conduct some initial tests on the materials like cement, sand & metal(coarse aggregate).Tests like UNIT WEGHT, SPECIFIC GRAVITY,SIEVE ANALYSIS,SLUMP CONE TEST & COMPACTION FACTOR TEST. According to the obtained results do the mix design from IS CODE of IS800-10262 check for water cement ratio & calculate the quantity of cement, sand & coarse aggregate.
Clinker factor in cement refers to the percentage of clinker in the total mass of the cement. Clinker is the main component in cement production and is produced by heating a mixture of raw materials to a high temperature. A lower clinker factor indicates a more sustainable cement production process, as it reduces carbon dioxide emissions associated with clinker production.
Pavement quality concrete, (PQC) measurement of workability by determination of compacting factor will be more appropriate than slump.It is not a suitable method for very wet or very dry concrete.It does not measure all factors contributing to workability, nor is it always representative of the placability of the concrete.
Because the cement will damage
The composition of soil is directly related to density and water retention level. These factors are important in determining the level of soil compaction necessary to hold a stucture's given weight without sinking or shifting. There are other factors that relate to health codes, environment, etc., but compaction is the most obvious factor in building construction.
As pozzolan greatly improves the strength and durability of concrete, the use of ash is a key factor in their preservation and add to the concrete's final strength and increase its chemical resistance and durability.It can also increase workability of cement while reducing water demand. The replacement of Portland cement with fly ash also reduces the greenhouse gas foot print of concrete, as the production of one ton of Portland cement produces approximately one ton of CO2. Since the worldwide production of Portland cement is expected to reach nearly 2 billion tons by 2010, replacement of 30% of this amount by fly ash could dramatically reduce global carbon emissions.
A dry environment is the most important factor when storing cement. yes, yes i think that the guy who wrote the answer above is corredt :) X X X
In rock science, compaction refers to the process of reducing the volume of sedimentary rocks by the weight of overlying sediment and rock layers. This process occurs due to the removal of pore space between sediment grains, which increases the density and strength of the rock. Compaction is a key factor in the formation of sedimentary rocks such as sandstone and shale.
Economic
The areas are related by the square of the scale factor.