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Dampness of Wall And The Necessity Of Kerb Concrete In Sunken Areas

Er. Vaishnav C R Nair

The slabs are made depressed in depth form the general floor level in wet area like toilets, balconies, wash area in kitchen etc. This is to ensure the wet and dry area separations in buildings. Even though the sunken slabs provided the toilet and balcony areas are found with a major quality problem of Dampness. This is due to the continues contact of water with building blocks. Here comes the importance of Kerb Construction.


Water Proofing By Ferrocement

Materials Engineer, Roorkee

Ferrocement as a construction material has now gained acceptance in different applications, namely : housing, agriculture, marine, water supply, sanitation, water proofing treatment etc. Numerous studies published have built up confidence in the material resulting its wider application,

Traditional methods of roof water proofing by lime concrete and mud phuska with thin burnt clay tiles are very cumbersome, time consuming involved high labor cost and also due to non availability of traditional skills and good materials these methods of water proofing are now not very popular. Though bitumen felts are also provided for water proofing their life is less than five years and need frequent replacement.


Waterproofing of Roof With Discarded Tyre Rubber Crumb

Kaushal Kishore, Materials Engineer, Roorkee

About one crore 10 lakhs all types of new vehicles are added each year to the Indian roads. The increase of about three crores discarded tyres each year pose a potential threat to the environment. Tyres are recycle yet significant number are added to existing tyre dumps or landfills. The generation of waste tyres far exceeds than now being recycle. Waste rubber tyres cause serious environment problems all over the world. This accumulated waste materials can be used in Civil Engineering Construction.

Early studies on the use of worn out tyres in asphalt mixes were very promising, not much attention has been given to the use of rubber from scrap tyres in portland cement concrete. So far no research has been done in the use of rubber crumb for RCC and RB roof slab water proofing.

Can joint sealant provide a perfect watertight seal in joints?

The two main principal functions of joint sealant are to minimize the entry of surface water and prevent the ingress of incompressible material from entering the joint. Other minor function of joint sealant is to reduce the possibility of corrosion of dowel bar by the entrance of de-icing chemicals.


Water entry into joints is undesirable because it leads to the softening of subgrade and pumping of subgrade fines under heavy traffic. However, it is impractical to maintain a completely watertight pavement structure. In fact, vacuum tests show that no sealants could provide 100% watertight seal. The current philosophy to combat water ingress into joints is only to minimize but not to completely prevent water from entering the pavement structure. Instead, a permeable subbase is designed to remove water from the pavement.

This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

Roof Waterproofing By Brick Bat Coba

Er. Kaushal Kishore ,
Materials Engineer, Roorkee

Waterproofing is a treatment of a surface or structure to prevent the passage of water under hydrostatic pressure. Waterproofing barrier system may be placed on the positive or negative side. Damp proofing is a treatment of a surface or structure to resit the passage of water in the absence of hydrostatic pressure. A damp proofing barrier system is used to perform the same functions as a waterproofing system but cannot be used to protect against water pressure. Water may be forced through building members by hydrostatic pressure, water vapour gradient, capillary action, wind-driven rain, or any combination of these. This movement is aggravated by porous concrete, cracks or structural defects, or joints that are improperly designed or installed. Leakage of water into structure may cause structural damage, and invariably cause damage to the contents of the structure.