Project Report On Mix Concrete

project report on mix concrete

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http://www.ziddu.com/download/19766528/finalreport.pdf.html

High Performance Concrete

The current trend of use of superlatives in concrete technology may strike as
somewhat disconcerting to many .We had high strength concrete, hyperplasticiser, and
superplasticisers, very reactive Pozzolana, and now high performance concrete. It is difficult to imagine any concrete being manufactured and used, which is not intended to perform to the extent; high performance concrete is not a new material of construction.

It is difficult to imagine any concrete being manufacture and used, which is not intended to perform. The only difference is the level of performance, which is higher than ordinary. High Performance Lightweight Concrete (HPLC) has been extensively investigated for, among other applications, use in oil drilling platforms in severe environments.

The relationships and allowable stresses and the stress block given in structural codes for normal strength concrete (e.g. IS 456 or IRC 21) will require modification. Acceptance testing on site has to be more than cube testing at28 days. Where durability of concrete is the driving force for adoption of high performance concrete, in-situ permeability tests are performed as a matter of routine.

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http://www.ziddu.com/download/19766452/HIGHPERFORMANCECONCRETE.pdf.html

Maturity Concept of Concrete

Maturity Concept of Concrete
(if file is not opening then rename file to maturity.pptx)

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http://www.ziddu.com/download/19766323/maturity.ppt.html

Instant Concrete Road Repair Solution

The Durability of road structures depends on the quality of its maintenance & minor renovations. Maintenance keeps the roadway safe, provides good driving conditions & prolongs the life of the pavement, thus protecting the road investment.

Currently in India more than 2000 km of concrete road is in the operation since last few years. Most of the projects completed by NHAI, MSRDC and other state government authorities.

Though the quality & procedural aspects, specifications / guidelines clearly mentions in IRC, MoRTH, but still we observes that various minor cracks, potholes and joints edge spalling in the PQC due to various factors which requires maintenance.

Maintenance includes the prompt sealing of cracks & filling of potholes to prevent water entering through the surface.

Repairs and rehabilitation of concrete roads are required to have a smooth riding quality as well as avoid inconvenience causing to the vehicles.

We need to have a durable repair products to avoid of cost of various factors like :
a) Diverting the traffic for repairs
b) Inconvenience to the traffic
c) Repeatedly cost of repairs by using conventional methods.

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http://www.ziddu.com/download/19758116/InstantConcreteRoadRepairSolution.pdf.html

Concrete Forms Construction of Reinforced Concrete Walls

Reinforced concrete walls construction for building a house. The Wall-Ties & Forms concrete forming system is helping concrete contractors build quality concrete homes rapidly, and cost effectivly. More concrete forming videos available at www.wallties.com.

Design of the RCC Concrete Plants

 

 

 

 

 

Automatic Feeding System

Dumpers or belts convey the coarse aggregates via feeding hopper and conveyor belts to the stock pile. From the stock pile the particular fractions are conveyed via conveying troughs onto the corresponding belts. Each specific grain size can be batched onto each belt. With these two belts the coarse aggregates are conveyed to the 150 m long cooling gallery.

The fine aggregates as well are conveyed via feeding hopper and belt to the stock pile. The fine aggregates are conveyed to the inline silo without being chilled.

Cooling of Coarse Aggregates

Water chillers produce large quantities of cold water at + 4 degree C. The cold water is sprayed via nozzles across the total length of the cooling gallery onto the rock grains greater than 5 mm. At the end of the cooling gallery we obtain a temperature of the graining of approx. + 7 degree C. The aggregates are dewatered at selected points. At the end of the cooling gallery dewatering screens dewater the material to a residual moisture of 2 %. This method is very effective because much water is accumulated in the coarse grain.

Water is then led into the sedimentation tank to have the flushed floating particles deposited. The cleaned water is now cooled again and added to the circuit.

Alternatively for other projects and according to the requirements the cooling of the aggregates can be effected in an aggregate cooling silo.

The particular cooled components are conveyed into separate compartments of the insulated inline silos. The sizes of the separate compartments of the inline silo have been dimensioned to take up the total capacity of the belt. It is important for safety requirements that each component can be conveyed via each belt into each compartment of the inline silo.

Production and Handling of Ice Flakes

Two containerized flake ice plants produce 24 hours continuously flake ice into both ice storage tanks. The requested ice is conveyed with screws from these ice storage tanks into the day tanks which provide the ice to the particular ice weighers for weighing. The requested ice can be supplied from each day tank into each of the 4 ice weighers.

Water Chillers

The water chillers have been containerized as well. They provide the cooling of the aggregates, the ice treatment and the requested mixing water for the concrete.

Storage and Transportation of Cementitious Materials

To guarantee a sufficient quantity of cement and pozzolan on site all in all 10 x 1000 t storage silos have been installed. Pneumatic cement blower systems provide the corresponding service silos – per plant 2 silos à 150 t – from these storage silos.

Concrete Batching and Concrete Production

To obtain the requested nominal plant capacity of 500 m³/h compacted concrete 2 twin plants with a total of 4 x3 m³ twin shaft mixers have been installed.

Each twin plant is equipped with an inline silo of 4 x 100 m³. From this inline silo the particular fractions are -according to the recipe – weighed additively on the weighing belt. All materials, such as aggregates, cement, pozzolan, admixtures, cold water and ice are weighed and conveyed into the mixer.

For a homogeneous mixing of the concrete Liebherr exclusively uses twin shaft mixers from internal production. These mixers stand out for short mixing times and short discharge times. Due to special wear plates these mixers have a very long durability. The maintenance works are reduced due to a central lubrication system.

Concrete Delivery System

Below each high performance mixer an especially developed rotary system has been installed which allows feeding the high speed belt and the dumpers as well which are filled from 2 mixers at the same time. The high speed belt has been equipped with a discharge point to provide further tipping of dumpers.

10 Things to Remember when doing Concrete Mix Design

Good quality concrete starts with the quality of materials, cost effective designs is actually a by-product of selecting the best quality material and good construction practices. Following are 10 Things to remember during Concrete Mix Design and Concrete Trials.

1. ACI and other standards only serves as a guide, initial designs must be confirmed by laboratory trial and plant trial, adjustments on the design shall be done during trial mixes. Initial design “on paper” is never the final design.

2. Always carry out trial mixes using the materials for actual use.

3. Carry out 2 or 3 design variations for every design target.

4. Consider always the factor of safety, (1.125, 1.2, 1.25, 1.3 X target strength)

5. Before proceeding to plant trials, always confirm the source of materials to be the same as the one used in the laboratory trials.

6. Check calibration of batching plant.

7. Carry out full tests of fresh concrete at the batching plant, specially the air content and yield which is very important in commercial batching plants.

8. Correct quality control procedures at the plant will prevent future concrete problems.

9. Follow admixture recommendations from your supplier

10. Check and verify strength development, most critical stage is the 3 and 7 days strength.

Important note:

Technical knowledge is an advantage for batching plant staff, even if you have good concrete design but uncommon or wrong procedures are practiced it will eventually result to failures.

We at engineeringcivil.com are thankful to Tumi J. Mbaiwa for submitting these 10 points which are helpful to each and every civil engineer.