Benefits of using plastic formworks in concrete construction

Plastic formworks in concrete construction are used to retain newly arranged concrete in place to provide adequate strength. Formworks facilitate to manage concrete efficiently and produce different types of shapes and forms.

Various types of materials like timber, steel, and aluminum are applied to develop formworks. Plastic is considered as best for formworks in relation to other materials in terms of strength, cost-effectiveness, and adaptability.



Sufficient time is required to develop the formworks. Formworks comprise 20 to 25% of the total cost of the structure. The security, cost, quality, and speed of a construction work mainly depend on formworks.

Plastic Formworks System

Benefits of Plastic Formworks in Concrete Construction

Plastic formworks provide various benefits like longevity, cost, and flexibility. Formworks consume huge labor force and total cost of the project. It is recommended that a formwork system should be cost-effective and assembled, disintegrated and managed smoothly by labor.

The plastic formworks provide the following benefits to the concrete construction:

• Economical
• Labor-friendly
• Eco friendly
• Low maintenance
• Flexible

Plastic Formwork System
Certain grade plastics are used to build up formworks. There are not any chemical reactions among poured material and the plastic form. No patch on the surface of the reinforce concrete element exists.

Leakages
Resist leakages with water or newly arranged concrete from various parts of the form by fitting different parts of the system accurately.

Labor-friendly system
Plastic formworks are considered very labor-friendly system. It accommodates and plugs smoothly and significantly lightweight with regards to other types of formwork systems.



Nailing and oiling
Nailing and oiling plates are not necessary. Auto-leveling of plugging system can retain plates level automatically. It takes fewer time to install and disassemble.

Cleaning
Plastic forms can be cleansed with water without difficulty. Plastic forms can be broken due to handling in an inefficient manner as well as use of low voltage hot air gun for sealing.

Plastic forms can be easily reprocessed and they are eco-friendly to minimize handling time and great re-usability index.


Article Source : https://www.cforcivil.com

How to estimate concrete in cubic yards

This is a nice presentation from Jerry Howard. In this video, one can learn how to estimate the concrete slabs precisely.

As an example, a rectangular concrete pad is taken with 40 feet length, 12 feet width and 4” thickness.



To find out the volume of this concrete pad, apply the following formula :-

V = L x W x H = 40 x 12 x .334 (4” is converted to feet by dividing with 12) = 160.32 ft3

But, if you want to purchase concrete from any company, they sell it in cubic yards. So, you have to convert unit of measurement from cubic feet to cubic yards.



To do this, you have to apply the following trick :-

160.32 ft3/1 = 1 yd3/27 ft3 = 160.32/27 yd3 = 5.9 yd3 = 6 yards (approx) [as one cubic yard = 27 cubic feet)

Image Source : http://cementech.com

Types of ties applied in building construction

Ties stand for continuous tensioned reinforcements to be fully anchored and adequately lapped through welding. Given below, different types of ties found in building construction :-

o Peripheral ties

o Internal ties

o Horizontal column and wall ties

o Vertical ties

Peripheral Ties in Building Construction

Peripheral ties are generally set up at roof and floor level and it arranged at 1.2m distant from the perimeter wall or edge of the building. The peripheral ties have the capability to resist a tensile force similar to the smaller of 60KN or an amount calculated in accordance with the following equation.

Ft = 20+4no -> Equation-1

Here:

n denotes the number of storey of the structure

The area of steel bars needed for the peripheral ties should be calculated in relation to the following equation:

Ast=Ft / (0.87fy) -> Equation-2

Ast denotes the steel area required for peripheral ties

Ft denotes tensile force to be combated by peripheral tie 

Peripheral ties should have been anchored and lapped effectively.

Image Source : theconstructor.org

Internal Ties in Building Construction

Internal ties are arranged at roof level and floor level in two directions almost perpendicular to each other.

Internal ties should have been efficiently continuous along their length and attached with both ends to the peripheral ties or bolted to the columns or perimeter walls if such ties are continuous to columns or perimeter walls. 

The highest distance among internal ties is similar to the 1.5 times the greatest distance among centers of vertical loading elements in the direction of ties.

The internal ties should resist a tensile force identical or exceeding the force calculated in accordance with the following formula:

Tensile force = 0.0267(gk+qk) lFt -> Equation-3

Here:

(gk+qk) defines the sum of average characteristic dead load and live load applied on the floor. These quantities are calculated based on the specifications of Eurocode.

To gather more information on other types of ties, go through the following link.
https://theconstructor.org/building/what-are-the-types-of-ties-used-in-building-construction/19000/?utm_source=pushengage&utm_medium=push_notification&utm_campaign=pushengage