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Friday, June 22, 2018

Fast Form Bracket System offers complete slab wall & sheet pile capping formwork Solution

Fast-Form provides complete solution for different types of pile cap, slab, base, beam, wall and sheet pile capping beam formwork whether they come in straight or radius, single or double sided.

This system can efficiently bolts together to facilitate casting kickers, plinths, hang bolts as well as monolithic bund walls etc.

There are 2 types of bases to pin directly to hard-core and ground by means of road pins, or bolt with re-usable concrete bolts to slabs and blinding concrete or even fasten them to decking with wood screws.

This system can be used without any difficulty. Just attach the brackets in a line and plumb up, screw on your ply from behind and pour your concrete.

Brackets are angled forward or back to make adjustment with sloping and battered pours along with irregular ground, thus making them much more compliant as compared to timber or panel systems.

The brackets are generated from superior grade galvanized steel to get rid of rust and they have longevity of 25 years plus. They are strong and do not get damaged. They can be also used underwater. Different sizes are available which range from 150 / 200 / 400 / 600 / 800 / 1200 & 1800mm high.


KEY BENEFITS:
• SAFETY: Access, handrails & toe boards, lightweight system that can be easily set up manually instantly and securely.
• SPEED: No need of de-nailing, lightweight and user-friendly system much faster as compared to conventional process and very simple to use with low labour skill levels.
• COST: It is very cost-effective as compared to timber with reduced labour and plant costs.
• ENVIROMENTAL: Little or no timber wastage and 100% completely recyclable materials which significantly minimize carbon emission deliveries.
• BETTER FINISH: Fair face finishes are obtained easily. The brackets are available with an F4 finish. So, fewer remedial works are required. Ply is fixed from behind systems, so, there is no marks on face of the concrete and any grade ply can be utilized as per your requirement.
To get more information, visit www.fastformsystems.com
Fast Form Bracket System offers complete slab wall & sheet pile capping formwork Solution

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Published By

Rajib Dey

www.constructioncost.co

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Thursday, June 21, 2018

Maturity Index is the latest method to find out concrete maturity & in-place strength during curing

The Maturity Index offers a simple process to estimate the in-place strength of concrete throughout curing. It is developed on the basis of the principle that the strength is can be obtained depending on the temperature-time history throughout the curing process.

By applying a thermocouple data logger with simple thermocouple temperature sensors implanted in the concrete, the data can be recorded easily. This data can then be instantly evaluated with excel spreadsheet to work out the maturity index.

Concrete maturity belongs to a measuring system of how much a batch of freshly poured concrete has cured. It is a quick indicator of the in-place strength at that point in time corresponding to the ultimate strength when the concrete is completely cured. Usually, the concrete strength is calculated on the basis of compression tests. The maturity method works out an index on the basis of time-temperature data that offer a relative indicator of strength.

This method is very useful since it can be performed instantly on-site with a temperature data logger and thermocouple sensors implanted in the pour. Besides, the method can save significant time and enhance safety by facilitating form removal, post-tensioning, joint sawing or putting structures in service ensuring that necessary strength has been achieved.

What is the Maturity Index?

The maturity is created on the perception that strength of concrete is dependent on the hydration of cement in the mix. This hydration stands for an exothermic reaction that emits heat. By recording the temperature profile at regular time gaps throughout the curing process, the strength of concrete can be computed on-site in real-time.

The American Society for Testing Methods (ASTM) developed a standard method for measuring the concrete strength with the maturing method, ASTM standard C 1074. This method is based on initial calibration process that needs assessment of the maturity index in line with more traditional compressive strength test to create the maturity index vs. strength curve. Once this curve is set it is supposed to be applicable for any pours which employ the identical mix recipe.

The maturity index is computed from the raw time temperature data with the following 2 expressions:

The temperature-time factor:
M(t)= ∑▒〖(Ta-To)∆t〗
Where:
M(t)= Maturity temperature-time factor
Ta = Average temperature during time interval ∆t
To = Datum temperature below which no hydration occurs
Δt = time interval between measurements
Equivalent age using an Arrhenius function:
t_e= ∑▒e^(-Q(1/Ta- 1/Ts)) ∆t
Where:
te = Equivalent age
Q = Activation energy divided by gas constant K
Ta = Average temperature during time interval ∆t
Ts = Datum temperature below which no hydration occurs
Δt = time interval between measurements
To get more details go through www.DataLoggerInc.com
Maturity Index is the latest method to find out concrete maturity & in-place strength during curing

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Published By
Rajib Dey
www.constructioncost.co
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Tuesday, June 19, 2018

Some useful tips for reinforcement detailing

Given below, some useful tips for reinforcement detailing :-

Create drawings perfectly. Try to mark every bar and demonstrate its shape for transparency.

Cross section of retaining wall that falls quickly as soon as soil backfill is arranged since ¼” dia is used instead of 1 ¼” dia. Errors happen as exact rebar dia is covered with a dimension line.

If required, generate bar bending schedule.

Denote perfect clear cover, nominal cover or effective cover to reinforcement.

Settle detailed location of opening/hole and provide sufficient information for reinforcement around the openings.

Utilize the size of bars and spirals which are easily accessible. For a single structural member, there should limited numbers of various sizes of bars.

The grade of the steel should be mentioned properly in the drawing. Deformed bars should not contain hooks at their ends.

The enlarge details at corner, intersections of walls, beams and column joint should be demonstrated at identical situations. There should not be congestion of bars at points where members overlap and ensure that all reinforcements are placed perfectly.

For bundled bars, lapped splice of bundled bars should be formed by connecting one bar at once; such separate splices inside the bundle should be staggered.

Ensure that the hooked and bent up bars are arranged and there is sufficient protection for concrete.

Specify all expansion, construction and contraction joints on plans and provide details for such joints.

The position of construction joints should be at the point of minimum shear roughly at mid or adjacent to the mid points. It should be created vertically instead of a sloped manner.

Article Source: onlinecivilforum.com

Some useful tips for reinforcement detailing

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Published By
Rajib Dey
www.constructioncost.co
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Monday, June 18, 2018

Definition, causes and remedies of efflorescence in masonry & other building surfaces

Efflorescence stands for a fine, white or greyish, powdery deposit of water-soluble salts that is present on brick, concrete, stone, stucco or other building surfaces when the water vaporizes. Besides, efflorescence also exists on floors and walls and requires special attention. It is often mentioned as "whiskers”.

These efflorescent salt deposits is found at the worst times, normally about a month as soon as the building is developed, and sometimes as long as a year after finishing of structure.

Efflorescence is found in both indoors and exterior, and it can differ in frequency and intensity because of the existence of moisture and temperature.

The efflorescence happens for the following three factors :-

• Existence of water-soluble
• Salts are converted into a soluble solution because of moisture content.
• The transmission of salts through a material to its surface that leads to vaporization of the moisture and cause the salts to crystallize and thus efflorescence is formed.


Moisture is mainly formed due to water, rain and snow and may affect the extent of efflorescence. Condensation, groundwater tapering and interior activities also may influence the extent of moisture formation.

In several cases it is found that efflorescence may happen throughout home construction. If masonry units are left behind all through the night during construction, they can consume moisture from damp soil and rain. It is recommended that masonry units should be wrapped and left in pallets to reduce the risk of efflorescence during a construction project.

The following installation issues associated with building surface result in creating efflorescence

• Improper application of through-wall flashing
• Utilization of masonry devoid of adequate ventilation
• Utilization of masonry in areas where a perfect moisture barrier does not exist
• Joint material failure
• Imperfect ground storage


How to get rid of efflorescence - The following measures should be taken to avoid efflorescence:

1) Hydrophobic Sealant: Use a saturating hydrophobic sealant to a building material surface to resist the immersion of water. The sealant also will resist water from passing through a building material.

2) Capillary Breaks: Set up capillary breaks like polyethylene sheeting among a building material and soil to reduce the risk of salt penetrating the material.

3) Standard Masonry Construction: Apply overhanging copings, eaves and flashings will help in reducing the risk of entering water into a wall.

4) Better Emphasis on Landscaping and Sprinklers: Give concentration to landscaping and sprinklers will guarantee to avoid water from reaching permeable building materials.

5) Set up Grout with Mechanical Vibration: Compile grout with mechanical vibration will control the occurring of voids in the grout.

6) Apply Dense Tooled Mortar Joints: Provide dense tooled mortar joints to minimize the permeable nature of a wall, making it strong for salts to pass through it.

7) Utilizing Grout Admixtures: Various grout admixtures like chemical additives should be used since they can make flow of a grout mix better and minimize its water content all together to lessen voids in grout.

8) Preserve Masonry Materials Properly: Retain masonry materials off the ground and wrap them with water-resistance materials to safeguard these materials from groundwater and precipitation.

Article Source: www.nitterhousemasonry.com

Definition, causes and remedies of efflorescence in masonry & other building surfaces


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Published By
Rajib Dey
www.constructioncost.co
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Saturday, June 16, 2018

Some vital methods for concrete curing

METHODS OF CURING :- Based on the type of construction work, the curing of concrete is done with the use of the following processes :-
1) COVERING: Under this method, wet gunny bags or hessian are utilized to wrap the newly developed concrete surface. This process is very effective for horizontal and vertical surface.
2) PONDING: Under this process, the entire surface is segregated into rectangular or square cages with the development of tiny clay bunds and these cages are filled with water occasionally building small ponds. This process is ideal for curing horizontal surfaces like floor, pavements etc.
3) SUBMERGING IN WATER: Pre-cast concrete members are over and over again cured by submerging them under water.
4) STEAM CURING: With this process, steam under pressure is sprinkled over the concrete surface. This process is very useful for pre-cast members.
5) SPRINKLING: Under this process, the water is sprinkled repeatedly over the concrete surface to keep the surface wet.
6) CURING WITH CHEMICAL: Under this process, water is sprayed over the surface as soon as specific amount of hygroscopic salt like NaCI, CaCletc are added. It helps to engross moisture from the atmosphere.
(7) MEMBRANE CURING: Under this process, concrete surface is wrapped with water proof membrane like wax emulsion, bitumen emulsion etc. The membrane stops the vaporization of water from concrete surface.
Article Sourcewww.civilnoteppt.com
Some vital methods for concrete curing


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Published By
Rajib Dey
www.constructioncost.co
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Friday, June 15, 2018

RCC Column Design – An exclusive mobile based app for civil and structural engineers

RCC Column Design is an exclusive app for civil and structural engineers. This app is available in google play store. It can only work in windows platform.


The app is very user-friendly. There are several fields in the app which range from Factored Axial Load (kN), Length (mm), Width (mm), Concrete Strength (M15, M20 and M25), Steel Strength (HYSD 415, HYSD 500).
Just enter the values in these fields and click on calculate button to get the desired values.
This app is designed on the basis of the Limit State Method with adherence to Indian standard code IS 456:2000. This app takes into account the axial load on a column to recommend a secure design depending on input of column size, concrete strength and steel strength. The app is also very useful for Uniaxial and biaxial bendings.
This app can design a rectangular slender RCC column that contains standard height. It works out necessary reinforcement for a specified axial load for the assumed inputs.
This app is developed for educational purposes only. The answers should be double checked manually.
To download the app, click on the following link play.google.com
RCC Column Design – An exclusive mobile based app for civil and structural engineers


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Published By
Rajib Dey
www.constructioncost.co
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Thursday, June 14, 2018

How to select perfect scaffolding material towers in construction project

Prior to start any construction project, the most important task is to obtain clear ideas on various types of scaffolding material towers. Improper selection of scaffolding material towers may lead to severe injury to the workers as well as loss of life.

Given below, the detailed lists of commonly used towers in construction site :-

MS Scaffolding Tower

This tower is mostly recognized in the industry due to its well-built design, stability, flexibility & rust resistance. It is built up with the superior quality raw material & cutting technology with regard to established industry standards. The size of the tower can also be customized according to the requirements of the clients. It is normally utilized throughout the formation of the building.

Some useful features of the tower

Perfectly designed, Rugged, Strong resistance capacity against decay

MS Scaffolding Movable Tower: MS Scaffolding Movable Tower is just an extension to MS Scaffolding tower that contains wheels. It is very flexible and can be easily shifted from one place to another without difficulty and huge man power. It also has good longevity & lock system. It is built up with approved hinges and castor wheels with adherence to industry standards.

Features: Strong load bearing capacity, Hassle free movement, Rust proof finish

H Frame Scaffolding Tower: H Frame scaffolding manufactured with superior quality steel having sound tensile strength. Its height is modifiable. There are scissor braces in the tower which are attached through gravity locks to avoid any breakage or mishap. By applying the combination of changing sizes of H Frame, towers can be structured to proper heights.

H Frame Structure: H Frame structure is a part and parcel of H Frame scaffolding. Different types of H Frame structures are combined to form a scaffolding tower. Due to its powerful locking skill, the tower can stand as tall as necessary.

Scaffolding Staircase: There are different types of scaffolding staircases. The size of the staircase can be easily customized as per requirement. Usually, the engineers visit the location of the construction site and offer solutions and build up custom structure as per requirement.

How to select perfect scaffolding material towers in construction project

Read more

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Published By
Rajib Dey
www.constructioncost.co
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