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Showing 1 to 20 of 34 for “"Concrete Durability"”.
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An estimation of concrete durability
Recent trends in concrete durability design have favored the use of protective coatings. Although these coatings, if applied correctly, can totally inhibit degradation of the concrete member, these coatings are expensive. In the most severe conditions, the coatings are the only way to avoid …
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Predictions of reinforced concrete durability in the marine environment
… empirical method is proposed for predicting the durability of reinforced concrete structures in the marine environment. The objective was to identify reliable means of characterizing early-age properties of concrete which affect durability and relate these to the durability performance of the …
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Laboratory assessment of asphalt concrete durability utilizing balance mix design
… States; thus, it is essential to guarantee its durability. Better durability of asphalt concrete (AC) pavements would translate into less maintenance and repair, better ridership quality, and reduced environmental impacts. However, in the current design practice for AC materials, little …
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Critical review of the South African Concrete Durability Index tests
The Durability Index (DI) approach is a performance-based approach used in South Africa for specifying the durability of reinforced concrete structures with regard to service life and concrete quality. The approach comprises three DI tests which are used to measure the durability-related transport …
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Evaluation of the Impact of Anti-Icing Solution on Concrete Durability
… analyze the influence of anti-icing solutions on concrete by examining the extent of chemical penetration. The primary focus is to determine the freeze-thaw durability and concentration of salt in concrete samples. In essence, the research intends to establish a correlation between the salt mass …
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An international perspective on performance-based specifications for concrete durability, with a suggested framework for implementation
Reinforced concrete (RC) is one of the world's most durable building materials. However, outdated and insufficient durability specifications often lead to the early deterioration of RC structures, escalating global maintenance costs. Prescriptive durability specifications for reinforced concrete …
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Repair and rehabilitation of reinforced concrete harbour structures
Damage to reinforced concrete infrastructure due to chloride-induced corrosion is widespread throughout the marine environment in South Africa. This thesis is an investigation into four current concrete repair contracts at harbours in the Western Cape. The works are critiqued in terms of repair …
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The influence of mix design parameters and compressive strenght on durability indices
Current concrete specifications used in mix design are mainly of the prescriptive type, i.e.recipe-based specifications that prescribe limiting values for certain mix design parameters such as minimum binder content, maximum water/binder (w/b) ratio and minimum compressive strength class. This has …
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Practical application of the torrent permeability test method with the South African durability index approach
Tests that assess the potential durability of concrete offer robust evaluation approaches for predicting its performance. The South African Durability Index Approach (SADIA) and the Torrent method are used in South Africa and Switzerland, respectively, to assess the potential concrete durability of …
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The durability of fly ash concrete in marine and softwater environments
Concrete is attacked by aggressive agents in the marine and softwater environments which reduce the durability of concrete. To help lessen the effect of this aggressive attack, fly ash concrete has been recommended for use in these environments. The lower permeability, increased chemical resistance …
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A study of the influence of aggregate grading on concrete penetrability
Concrete is generally perceived as being an inherently durable material. However, many concrete structures need substantial repairs and maintenance during their service life, with the resultant costs to the economy reaching 3-5 % of GNP in some countries. Durability is therefore key in concrete …
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Moisture measurements in concrete and characterization using impedance spectroscopy and RC network circuits
The importance of moisture in concrete is unquestionable. However, quantifying the moisture in concrete is very difficult as concrete microstructure water interactions are not well understood. Concrete is a very complex material spanning the range from the atom to the civil infrastructure. It is …
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Fibre cement boards as permanent formwork for reinforced concrete elements
… time-consuming activity in the construction of concrete structures. A significant factor in the construction's time and cost components is the use of temporary formwork systems which have reusability limitations. Permanent formwork provides an alternative type of formwork that remains in place …
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Durability specifications for structural concrete: an international comparison
Premature deterioration of reinforced concrete (RC) structures has become an issue of global concern. As a result, many upgrades and improvements have recently been made in design standards and specifications, to include requirements that account for durable RC structures. This dissertation …
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Behaviour of massive reinforced concrete sections in seawater
… ultimate life of large offshore reinforced concrete structures. Although much research has focussed on concrete degradation due to chloride ingress, corrosion of permanently submerged concrete is regarded as negligible due to the long-assumed apparent worst case of tidal or splash zone …
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Investigation of parameters governing the corrosion protection efficacy of fusion bonded epoxy coatings
… the passivation of the bare steel exposed to the concrete pore solution at the breaches in the epoxy coating is not the same as a bare bar under similar exposure conditions allowing it instead to corrode at lower concrete chloride concentration levels than bare bars. The results also show a …
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The state of Namibia's concrete infrastructure – A comparative study of Walvis Bay, Swakopmund, Arandis and Usakos towns
… the design and construction specification of concrete (for durability) follows the traditional method of prescribing parameters which over time are believed to produce durable concrete. These parameters include concrete exposure definition, cover, concrete strength, concreting materials and …
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Durability Assessment and Service Life Prediction of Concrete in Extreme Aggressive Environment
… objective of this research is to enhance the durability of newly constructed structural elements by assessing the performance of various concrete mixes for chloride resistance. The study focuses on establishing and developing correlations between chloride diffusion rates and concrete …
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Review of current practices to reduce reinforcement corrosion in concrete structures managed by the City of Cape Town
The repair and maintenance of ageing reinforced concrete (RC) structures has become increasingly costly, especially in the Cape Peninsula. Protection and maintenance of these reinforced concrete structures against concrete deterioration and rebar corrosion have become far more important for road …
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Using cathodic protection to control corrosion of reinforced concrete structures
… (CP) has been increasingly used on reinforced concrete structures to protect steel reinforcement from corrosion. However, due to the complexity of environmental conditions, the specifications in national and international standards are still open to discussion in engineering practices for their …
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