Home | | Repair and Rehabilitation of Structures | Marine exposure of Concrete

Chapter: Civil - Repair and Rehabilitation of Structures - Repairs, Rehabilitation and Retrofitting of Structures

Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail

Marine exposure of Concrete

Durability of concrete exposed to sea-water again stresses that of all chemical and physical properties, permeability of concrete is the most important factor influencing performance.

Marine exposure

 

Durability of concrete exposed to sea-water again stresses that of all chemical and physical properties, permeability of concrete is the most important factor influencing performance. Concrete are achieved by using mixes having high cement contents and low water: cement ratios, through consolidation and control of thermal and shrinkage cracking, and limiting cracks due to mechanical loading.

 

1Physic-chemical effects of sea water on hydrated cement as follows:

 

Chemical attack by sea water on cement only occurs in the case of permeable concrete

C4AF, in contrast to C3A has no deleterious effects

Portland cements with C3A contents lower than 10% resist chemical attack in sea-water

Cements containing more than 65% slag are most resistant to sea-water attack

The effects of pozzolan depend on their mineralogical composition and reactivity

Compressive or flexural strengths are not a good basis for assessing durability once reactions commence; a much b etter basis is the measurement of expansions as they continue

 

2Application of materials

 

Mortar placement

Injection into cracks

Large-scale Repair

 

Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail


Copyright © 2018-2020 BrainKart.com; All Rights Reserved. Developed by Therithal info, Chennai.