Airports, Concrete, Documentation and News - Professional Constructor Central

STRUCTURAL USES OF PRECAST CONCRETE

The Constructor

MARCH 25, 2012

Use of Precast Concrete in frames: There are two main types of precast building frame. Mon, 1 Oct 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates. The structural frame consists of slabs, beams and columns.

Concrete

Concrete Foundation Maine Materials

TEMPERATURE EFFECTS ON CONCRETE

The Constructor

MARCH 21, 2012

The size of movement depends upon the change in temperature and the coefficient of thermal expansion o f concrete. The coefficient of thermal expansion of concrete is influenced largely by the coefficient of thermal expansion of the aggregates since the aggregate occupies 70-80% of the volume of the concrete.

Concrete

Concrete Foundation Contract Materials

BENEFITS OF USING STEEL FIBRES IN CONCRETE

The Constructor

JANUARY 1, 2012

The benefits of using steel fibres in concrete are as follows: 1. Mon, 1 Oct 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates. Steel fibres are relatively short and closely spaced as compared with countinuous reinforcing bars of wires.

Concrete

REINFORCEMENT COVER AND PRE-CONCRETE CHECKS

The Constructor

MARCH 20, 2012

Mon, 1 Oct 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates. From the diagram above, we can see how the process unfolds. When the binding has set, the steel bars are placed into position.

Concrete

TYPES OF CRACKS IN REINFORCED CONCRETE SLABS

The Constructor

NOVEMBER 8, 2011

Cracks in reinforced concrete columns due to Steel Corrosion (cracks parallel to steel bars) 2. Cracks in reinforced concrete columns due to shrinkage of concrete 3. Cracks in reinforced concrete columns due to increased load on the slab 4. Cracks in reinforced concrete columns due to sulphate attack 5.

Concrete

REDUCING DRYING SHRINKAGE IN CONCRETE

The Constructor

NOVEMBER 8, 2011

Mon, 1 Oct 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates. This type of shrinkage is caused by the loss of moisture from the cement paste constituent, which can shrink by as much as 1% per unit length.

Concrete

Concrete Foundation Contract Materials

TYPES OF CONCRETE MIX DESIGN

The Constructor

NOVEMBER 15, 2011

Nominal Mixes In the past the specifications for concrete prescribed the proportions of cement, fine and coarse aggregates. Mon, 1 Oct 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates.

Concrete

Concrete Design Foundation Materials

PRECAST CONCRETE CLADDING CONSTRUCTION AND.

The Constructor

AUGUST 7, 2012

Mon, 1 Oct 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates. They may be load bearing, or they may be just decorative to act as a façade.

Concrete

ACCEPTANCE CRITERIA FOR DESIGN MIX CONCRETE

The Constructor

NOVEMBER 20, 2011

The concrete shall be deemed to comply with the strength requirements if: a) every sample has a test strength not less than the characteristic value;or b) The strength of one or more samples though less than the characteristic value, is in each case not less than the greater of : 1) The characteristic strength minus 1.35

Concrete

Concrete Design Foundation Materials

TYPES OF PRECAST CONCRETE CLADDING & FEATURES

The Constructor

AUGUST 7, 2012

Mon, 1 Oct 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates. This allows a greater performance from the cladding panel than simple building enclosure.

Concrete

Concrete Foundation Maine Materials

EXPOSURE CONDITIONS AFFECTING DURABILITY OF CONCRETE

The Constructor

AUGUST 10, 2012

These are the environments to which the concrete will be exposed during its working life. Mon, 1 Oct 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates. These are: Mild exposure Moderate exposure Severe exposure Very severe exposure, and Extreme exposure.

Concrete

Concrete Foundation Environment Materials

FACTORS AFFECTING STRENGTH OF CONCRETE

The Constructor

MARCH 21, 2012

in dry conditions), it should be suitable for use in concrete. Sun, 30 Sep 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates. Quality of Raw Materials: Cement: Provided the cement conforms with the appropriate standard and it has been stored correctly (i.e.

Concrete

Concrete Materials Foundation Design

PUMPED CONCRETE PUMP TYPES & SELECTION

The Constructor

NOVEMBER 28, 2011

This method is used where large quantity of concrete work is involved at greater height, where other means of transporting is not easy to do. Concrete pumps have been known for more than 50 years.

Concrete

Concrete Transportation Foundation Design

WHY WE TEST CONCRETE SRTRENGTH AFTER 28 DAYS?

The Constructor

NOVEMBER 25, 2011

WHY WE TEST CONCRETE SRTRENGTH AFTER 28 DAYS? Tweet Why do we test concrete compressive strength after 28 days? The table below shows the compressive strength gained by concrete after 1, 3, 7, 14 and 28 days with respect to the grade of concrete we use.

Concrete

FEATURES OF PRECAST CONCRETE

The Constructor

MARCH 25, 2012

There is no grout loss, such as that from badly fitting formwork, which results in poor quality concrete like shown below. Mon, 1 Oct 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates.

Concrete

PRESTRESSED CONCRETE OVER REINFORCED CONCRETE.

The Constructor

MARCH 23, 2012

There are two ways of overcoming this problem: Embed another material in the concrete which is strong in tension – reinforced concrete Remove the tension altogether – by arching or prestressing.

Concrete

Concrete Foundation Materials Comparison

CONCRETE CREEP

The Constructor

MARCH 22, 2012

Following are the cases, which affect creep in concrete: When the aggregate volume is increased, creep will be less as the aggregate is more rigid than the cement paste. Mon, 1 Oct 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates.

Concrete

CELLULAR LIGHTWEIGHT CONCRETE?FLY ASH BASED

The Constructor

NOVEMBER 22, 2011

It has many advantages when compared to the normal conventional concrete. Mon, 1 Oct 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates. Fly ash is considered as one of the waste industrial product that cannot be easily disposed.

Concrete

PRECAST CONCRETE PROCESS

The Constructor

MARCH 25, 2012

The following figures illustrate the precast concrete process: 1. Sun, 30 Sep 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates. The individual components are prefabricated off site then taken to site where they are erected.

Concrete

CONCRETE CURING METHODS

The Constructor

NOVEMBER 21, 2011

Both the rate and degree of hydration, and the resulting strength of the final concrete, depend on the curing process that follows placing and consolidating the plastic concrete. Mon, 1 Oct 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates.

Concrete

WHAT IS PRECAST CONCRETE?

The Constructor

MARCH 25, 2012

WHAT IS PRECAST CONCRETE? Tweet Precast concrete is cast under factory controlled conditions and not erected on site until it is fully hardened. Tweet Precast concrete is cast under factory controlled conditions and not erected on site until it is fully hardened.

Concrete

TESTS ON WATER FOR CONCRETE

The Constructor

AUGUST 18, 2012

Sun, 30 Sep 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates. The initial setting time should not be less than 1 hour and to be within 25% of the result with distilled water.

Concrete

THIN SHELL CONCRETE STRUCTURE?TYPES & FORMS

The Constructor

NOVEMBER 17, 2011

Sun, 30 Sep 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates. The shells are most commonly flat plates and domes , but may also take the form of ellipsoids or cylindrical sections, or some combination thereof.

Concrete

REPAIR OF POST CONCRETING DEFECTS IN STRUCTURES

The Constructor

MARCH 20, 2012

Cleanliness: when repairing concrete, care must be taken to remove any dirt or dust that will prevent the repair concrete bonding with the parent concrete. Mon, 1 Oct 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates.

Concrete

Concrete Portland Foundation Materials

LOADS ON PRECAST CONCRETE CLADDINGS

The Constructor

AUGUST 24, 2012

Sun, 30 Sep 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates. Cladding panels behave like wall panels and are therefore subjected to the same forces, i.e. axial compression, horizontal flexure due to wind, and in-plane and out-of-plane shear.

Concrete

COMPOSITION OF REACTIVE POWDER CONCRETE (RPC)

The Constructor

DECEMBER 17, 2011

It is new technique involved in the civil engineering.Reactive powder concrete in made by replacing the conventional sand and aggregate by grounded quartz less than300 micron size, silica fume, synthesized precipitated silica ,steel fibers about 1 cm in length and 180 micron in diameter.

Concrete

Concrete Portland Foundation Materials

STRESS-STRAIN CURVE FOR CONCRETE

The Constructor

JANUARY 22, 2012

The stress strain curve of concrete lies between those of the aggregate and the cement paste. Sun, 30 Sep 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates. The aggregate is more rigid than the cement paste and will therefore deform less (i.e.

Concrete

BULK DESNSITY OF CONCRETE

The Constructor

NOVEMBER 28, 2011

Procedure for measuring bulk density of concrete is as per IS 1199 – methods of sampling and analysis of concrete. Sun, 30 Sep 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates.

Concrete

HAND MIXING OF CONCRETE

The Constructor

NOVEMBER 21, 2011

The concrete can be specified in two ways : a) by proportioning of the constituents /ingredients (nominal mix) b) by required strength (Design mix) Concrete is mixed by any two methods, based on requirement as per quality and quantity of concrete required.

Concrete

Subways in America

The Constructor

NOVEMBER 11, 2011

Mon, 1 Oct 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates.

America

America Concrete Foundation Airports

FOUR PHASES OF PROJECT MANAGEMENT

The Constructor

SEPTEMBER 10, 2012

Closing down the project: Once the execution of the project is completed, the project team evaluates the team’s performance, documents related to the project are achieved, lessons learned form the experiences in the project is captured and celebrate the project’s completion.

Project Management

Project Management Management Concrete Foundation

Introduction to Finite Element Methods-The Book-Part-2

The Constructor

JANUARY 14, 2012

Mon, 1 Oct 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates.

Concrete

HYBRID CONSTRUCTION TECHNIQUE AND STRUCTURAL.

The Constructor

MARCH 26, 2012

Hybrid concrete construction can incorporate all the benefits of precasting, (e.g. Sun, 30 Sep 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates. economy, flexibility, moulability, continuity and robustness).

Concrete

CONNECTIONS FOR PRECAST FLOOR SLABS

The Constructor

APRIL 2, 2012

This tie prevents the beam and the slab separating during the in-situ concrete screeding operation. Finally, in-situ concrete is poured. Mon, 1 Oct 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates. Reinforcement is placed onto the top of the slab.

Concrete

PERMANENT FORMWORK METHOD FOR BEAM CONSTRUCTION

The Constructor

MARCH 27, 2012

More efficiently, they can act compositely with the in-situ concrete. Sun, 30 Sep 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates. Indeed some beams, particularly in seismic areas are designed to act both compositely and non-compositely in the same span.

Concrete

BALANCED CANTILEVER METHOD OF BRIDGE CONSTRUCTION

The Constructor

JANUARY 17, 2012

The complete pier segment is then used as an erection platform and launching base for all subsequent travelling formwork and concrete segment construction. Sun, 30 Sep 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates.

Concrete

Introduction to Finite Element Methods-The Book-Part-1

The Constructor

JANUARY 14, 2012

Mon, 1 Oct 2012 About Jobs Connect Groups Forums Toolbar SMS Alerts RSS Feed Search The Constructor Subscribe by E-Mail to receive latest updates.

Concrete

ACCELERATED CURING METHOD FOR COMPRESSIVE.

The Constructor

NOVEMBER 27, 2011

This method is also used to find out 28 days compressive strength of concrete in 28 hours. (As As per IS 9013-1978-Method of making, curing and determining compressive strength of accelerated cured concrete test specimens).

Concrete

FORMWORK AND GOOD FORMWORK PROPERTIES

The Constructor

MARCH 19, 2012

When concrete is fresh and in its liquid state it must be restrained within a mould in order for it to set in its required shape. A smooth outer surface provides the main support for the concrete as it sets. Formwork is the term used to describe this mould. For most in-situ pours, the formwork is made of wood.

Concrete