3 edition of Effect of poor curing conditions and remedies on the durability of steel in concrete. found in the catalog.
Effect of poor curing conditions and remedies on the durability of steel in concrete.
by Aston University. Department of Civil Engineering and Construction in Birmingham
Written in English
Thesis (PhD) - Aston University, 1987. :D
Always perform a trial treatment on an inconspicuous area to check for adverse effects and to perfect the technique. Read the Material Safety Data Sheets to be aware of the hazards associated with the acid. After removing the efflorescence, consider sealing the surface with an exterior concrete sealer. Welding Cover Plate and Stiffener. To provide the equivalent of a concrete slab that typically exists in bridges for preventing compression flange buckling, Wu et al.  attached a steel cover plate with welding on the outside surface of the top flange of the steel beams (Figure 2).They also welded web stiffeners on both sides of the web at the loading and .
Curing concrete in these regions usually requires solvent-based curing compounds or cure-and-seal chemicals to avoid freezing. Due to extensive freeze-thaw conditions, this region is prone to spalling and scaling concrete. Proper mix design, placement, and curing are crucial for long-term concrete durability. The ready-mix supplier should be. - a piece of steel plate, concrete or stone slab, sheet or metal pan etc. This support should extend 50mm beyond the base of the cone to provide space for the concrete to spread when the cone is removed later. Hold the cone firmly in place when putting concrete in .
Concrete is a highly alkaline substance that is stable at a pH between 10 and Raising and maintaining the pH in concrete has the effect of arresting the damage occurring in the concrete, which gives sodium silicates a distinct advantage over other products. In the curing, or maturing, of concrete there is a gradual decrease in the number and size of voids, an increase in strength, and a decrease in moisture content. In general, these factors are favourable to resistance of frost damage and it follows that the maturity of the concrete at the time of exposure to frost is critical to durability.
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Effect of the curing conditions on the restrained expansion of a concrete made with a sulphoaluminate-based expansive agent (a) and a calcium-based expansive agent (b) (Bissonnette et al., ). Collepardi et al. () studied the influence of curing conditions on the restrained expansion of a concrete having a w/c of containing 9% of a.
Effect of curing methods on strength and durability of concrete under hot weather conditions. However it was reported that the GGBFS concrete was more sensitive to poor curing than OPC concrete. The effect of curing conditions on the properties of hardened cement concrete was assessed by the following procedures: (i)Cited by: • Inferior mortar and concrete in the cover over reinforcing steel due to over-wet concrete, loss of entrained air, inadequate curing, excessive bleeding, improper jointing and sealing, or sever map cracking • Poor bonding of two-course floors due to; inferior quality of surface concrete in the base course, unremoved.
Effect of Impurities in Curing Water on Concrete Construction. The main intention of curing is to let the water penetrate the concrete. No water is necessary for curing if proper steps were taken to prevent the loss of water from the concrete.
There is inevitably some loss of water from the surface of the structural members due to evaporation. Ensure the beauty, durability, and crack-resistance of your next concrete project by adhering to these best (and worst) practices for curing concrete. The bad news is that the surface of the concrete should not have been allowed to dry out for a week or more, a time also referred to as the curing period.
The biggest problem you may be faced with is the effect the rain may have had on the surface of the concrete. In exceptional conditions (e.g., when concrete has high permeability and alkalies and most of the calcium hydroxide are either carbonated or neutralized by an acidic solution), the pH of concrete near steel may be reduced to less thanthus destroying the passivity of steel and setting the stage for the corrosion process.
Concrete is a construction material that is extensively used because of its excellent properties such as durability, workability, satisfactory strength, and the easy availability of raw materials (cement, aggregates, and water), which are used to produce it .By definition, concrete is a composite material that consists of a binding medium and aggregate particles.
This ensures proper maintenance of the alkaline nature within the concrete and the passivity of the steel bars. The steel bars should be precisely placed in position; Use of Good Quality Concrete: High quality concrete must be used. It helps to maintain proper alkaline nature.
For the concrete, a water/cement ratio of or less is to be. tlement within the concrete mass, or shrinkage of the surface (plastic-shrinkage cracks) caused by rapid loss of water while the concrete is still plastic (Fig. Settlement cracks may develop over embedded items, such as reinforcing steel, or adjacent to forms or hardened concrete as the concrete settles or subsides.
Settlement cracking. The length change is negligible and can be attributed to the normal distension of concrete. On the other hand, concrete suffering from mass loss gives a good indicator about the durability of SCC.
Permeability of concrete is an important factor in classifying its durability generally; concrete with low Permeability will afford better protection of the reinforcement within it than concrete.
This study presents the effect of incorporating metakaolin (MK) on the mechanical and durability properties of high strength concrete for a constant water/binder ratio of MK mixtures with cement replacement of 5, 10 and 15 % were designed for target strength and slump of 90 MPa and ± 25 mm.
From the results, it was observed that 10 % replacement level. Durability of Concrete • Effect of Air-Entrainment • An air-entrainment upto 6 % can make the concrete more impervious.
The steam curing of concrete using pozzolana has been reported to decrease the permeability due to formation of coarser C-S-H gel, lower drying shrinkage and accelerated conversion of Ca(OH)2 into cementing product. The effects of latex on the strength characteristics and durability of hybrid fibre-reinforced concrete were evaluated.
The hybrid fibre was composed of 02 vol.-% natural jute fibre and 0 By itself, concrete is a very durable construction material.
The magnificent Pantheon in Rome, the world’s largest unreinforced concrete dome, is in excellent condition after nearly 1, years. Maximum rate of increase is attained within 1 to 3 days of curing, its development depending on curing conditions, water/cement ratio, type of cement, amount of admixture, etc.
In comparison with a reference concrete (without calcium chloride), strength gain may vary between 30 and per cent in the first three days, the value falling with.
Concrete ingredients, their proportioning, interactions between them, placing and curing practices, and the service environment determine the ultimate durability and life of concrete.
Seawater Exposure: Concrete has been used in seawater. ACI “Hot Weather Concreting” defines hot weathers as any combination of the following conditions that tends to impair the quality of the freshly mixed or hardened concrete: The success of many hot-weather concreting operations depends on the steps taken to slow the cement hydration reactions within the concrete and to minimize the rate of evaporation of.
Reduced maintenance costs, Abrasion resistant concrete floor dust proof and lower absorption are some of the key benefits of polishing concrete floors. This could be polished concrete, an epoxy coating, a resin, or just even sealed. Such treatment has a positive effect on the floor’s functionality and other similarly important issues.
One of the main factors affecting the durability of concrete is corrosion of steel reinforcement. Consider for example that inthe National Association of Corrosion Engineers (NACE) released a comprehensive report estimating the annual global cost of corrosion at trillion dollars, with the cost in the USA alone estimated at USD.
Reinforced concrete (RC) (also called reinforced cement concrete or RCC) is a composite material in which concrete's relatively low tensile strength and ductility are counteracted by the inclusion of reinforcement having higher tensile strength or ductility.
The reinforcement is usually, though not necessarily, steel reinforcing bars and is usually embedded passively in the concrete .the wet concrete. While concrete easily resists compression, it does not tolerate tension well. To improve the tensile strength, steel bars are added to the concrete in places where tensile stress is expected to occur.
With reinforcement steel ﬁrmly embedded into the hardened concrete, it can be used to build load-bearing structures such as.Steel-reinforced concrete is used ubiquitously as a building material due to its unique combination of the high compressive strength of concrete and the high tensile strength of steel.
Therefore, reinforced concrete is an ideal composite material that is used for a wide range of applications in structural engineering such as buildings, bridges, tunnels, harbor quays.