Category: CONSTRUCTION

HOW TO PROTECT SUBSURFACE MOISTURE 0

HOW TO PROTECT SUBSURFACE MOISTURE

By Donald Baerman In this article, I will be discussing subsurface moisture protection and the effects of groundwater on buildings. Since waterproofing of the subsurface portions of a building is difficult to remedy, the reliability of the waterproofing and moisture control strategies is critical. Methods of moisture control of substructures include: Dampproofing, which retards the passage of water in the absence of hydrostatic pressure. Waterproofing, which prevents the passage of...

RETAINING WALL 0

RETAINING WALL

By Martin D. Gehner/Abasiekeme George Retaining wall is a wall that hold back or retain soil laterally between disparate grade level. Typically, the wall is cantilevered from a footing extending up beyond the grade on one side and retaining a higher level grade on the opposite side. Retaining walls is also known as basement wall. However, they are supported at the lowest end by the basement floor slab and at...

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HOW TO ASSEMBLE AND FIX REINFORCEMENT

Reinforcing steel for concrete is use in the main to provide resistance to tensile stresses in structural members. The steel reinforcing bars should be placed and secured in the positions inside formwork where they will be most effective in reinforcing concrete that will be poured and compact inside formwork around the reinforcement. It should be rigidly fixed in positions which will not displaced when wet concrete is placed and compacted....

ATACTIC POLYPROPYLENE MEMBRANE FOR BASE SLAB 0

ATACTIC POLYPROPYLENE MEMBRANE FOR BASE SLAB

ATACTIC POLYPROPYLENE (APP) is a modified bitumen polymer which improves the physical property of bitumen. This modified bitumen coating has overcome to a very good extent, to remove the drawback of conventional bitumen membrane of its undesirable temp; related variations like to become brittle at freezing temps and soft at high temps. Since waterproofing cannot be carried out using a single material, i.e. suitable for one structure, may not apt...

CRYSTALLINE WATERPROOFING SYSTEM: ITS APPLICATION AND ADVANTAGES 0

CRYSTALLINE WATERPROOFING SYSTEM: ITS APPLICATION AND ADVANTAGES

In this system, water bearing capillaries are blocked with insoluble crystals, the saturated surface is applied one or two coatings with crystalline waterproofing slurry. In modern construction technology developments, a single product or technique is not usually enough, involvement of various bodies and techniques in co–ordination is essential for making the structure waterproof. Structure should have sufficient and efficient various control joints like expansion joints, contraction joints, etc. if proper...

CONCRETE : REINFORCING BARS 0

CONCRETE : REINFORCING BARS

Deformed bars Deformed bars are used to limit the cracks that may develop in reinforced concrete around mild steel bars, due to the stretching of the bars and some loss of bond under load. It have projecting ribs twisted to improve the bond in concrete. The type of deformed reinforcing bars generally used are ribbed bars that are rolled from mild steel and ribbed along length, ribbed mild steel bars...

HOW TO DETERMINE WHERE TENSILE AND COMPRESSIVE STRESSES OCCUR IN STRUCTURAL MEMBERS OF A BEAM 1

HOW TO DETERMINE WHERE TENSILE AND COMPRESSIVE STRESSES OCCUR IN STRUCTURAL MEMBERS OF A BEAM

It is convenient to consider the behaviour of an elastic material. For instance, the diagram above illustrates Indian Rubber under stress. A bar of rubber laid across and not fixed to two supports bends under load and the top surface shortens and becomes compressed under stress and the bottom surface stretched under tensile stress. A member that is supported so that the support do not restrain bending under load is...

REINFORCEMENT IN CONCRETE 1

REINFORCEMENT IN CONCRETE

Reinforced Concrete Reinforced concrete Is the process of strengthening concrete by embedding steel in concrete which act together in resisting compressive strength of the concrete and tensile strength of the steel. Reinforced concrete is one of the two structural materials used in engineering construction and building works. Concrete is strong in resisting compressive stress but comparatively weak in resisting tensile stress. The tensile strength of concrete is between one tenth...

WATERSEAL: USES AND APPLICATION IN CONSTRUCTION 0

WATERSEAL: USES AND APPLICATION IN CONSTRUCTION

What is Waterseal? Waterseal is a waterproofing compound highly concentrated in powder form used in construction of all concrete structures which need to be protected from water. How to apply Waterseal in building construction Two percent of the compound by weight should be mixed with cement to obtain water repellent properties. One bag contain 1kilo of the Waterseal which is sufficient for one bag. After the measurement, Waterseal should first...

CURING OF CONCRETE 5

CURING OF CONCRETE

WHAT IS CURING ? Curing is the process of maintaining moisture on the surface of the concrete which helps the concrete to gain strength. Concrete gradually hardens and gain strength after its initial set. For this hardening to proceed and the concrete to develop its maximum strength, there must be water present in the mix. During the early days after the initial set, there is rapid loss in water, the...