High Strength Concrete | Learn about their advantages and disadvantages and where to use them
Concrete
Concrete is a mixture of different materials produced through a variety of combinations with the aim of performing a range of tasks.Types of concrete
Concretes vary to suit all purposes for which they are used, and these types include the following:- Modern concrete.
- High strength concrete.
- Nano concrete.
- aerated concrete;
- High performance sealed concrete.
- glass concrete.
- Asphalt concrete.
- High performance concrete.
- rubber concrete.
- gypsum concrete.
- Ultra-high performance micro-reinforced concrete.
- Self-hardening concrete.
- underwater reinforced concrete
- high strength concrete
It can be defined as that type of concrete with a strength of more than 600/kg/cm2. It may reach 1400 / kg / cm2, and while this concrete can be produced with the same materials and components used in conventional concrete, the high-resistance contains a new material, "Super Plasticizers", a substance that helps reduce the water of the mixture to the lowest possible degree while obtaining On the same formability, which results in a high resistance to concrete.
High strength concrete components
First of all, a group of materials must be selected that are homogeneous with each other, in order to give the required results of solidity, durability and the possibility of forming well, and then we come after that to determine their components, which are as follows:Large aggregate: It must be strong and durable, because it is the component that determines the durability and maximum hardness of concrete, as cracks in this type of concrete pass through the granules of large aggregate and not around it, as is the case in traditional concrete. What confirms this statement is that the study proved that concrete made of granite or dolomite gives 10-20% greater resistance than concrete made of gravel types.
Small aggregate: or sand, and it must be somewhat coarse, due to the fact that most of the other components are soft, so the sand must be coarse until all components are cohesive.
Cement: Cement must be of high quality and compatible with the rest of the components in order to obtain the required homogeneity. The ideal ratio that gives the greatest strength to concrete is between 450 and 500 kg/m3, i.e. from 9 to 10 sacks of cement, and this also depends on the properties and proportions of the rest of the components.
Silica dust: It is a pozzolanic substance that interacts with free calcium hydroxide, which results from the reaction of cement with water, forming an insoluble substance in water such as calcium silicate. Silica dust is between 10 to 15% by weight of cement.
Plasticizers: It is one of its most important components. Through this material, the proportion of mixing water is reduced to 25% of the weight of cement, thus obtaining the highest possible resistance of concrete. But it must be ascertained the homogeneity of this material with the types of cement used.
Uses of high strength concrete
For a long time, the use of this concrete has been confined to several limited traditional applications, with the aim of taking advantage of the high resistance value in obtaining the least section area and the least size of the structure, so the applications were limited to three main things, including:High rise buildings.
bridges.
marine installations.
But with the passage of time, new uses for this type of concrete appeared in a variety of unconventional applications, including, for example:
Revival of old structural elements such as arches.
They were used in steel sectors, which increases the severity of the facility.
Screw piling work without vibration or noise.
They were also used in nuclear power plants.
It is also used in underground concrete pipes.
It has also been used to obtain a high early resistance.
In addition to its use on sidewalks and roads.
The difference between high strength concrete and high performance concrete
High-performance concrete can be defined as concrete that has certain qualities and characteristics that distinguish it from other concretes, and it also includes characteristics of them such as workability and texture as in fresh concrete, as well as resistance to wear and scratching in hardened concrete, as well as frost resistance and shrinkage resistance.All of these properties can be combined or separate so as to produce concrete with different performance from conventional concrete. Moreover, high performance concrete is not required to be of high strength.
Advantages of high strength concrete
Its compressive strength is seven times greater than that of conventional concrete, with resistance ranging from 600 to 1400 / kg / cm2.Its elasticity standards are equal to two or more times than conventional concrete flexibility standards.
The lack of concrete sectors, and consequently the low weight of the facility and an increase in the sea of structural elements.
The most important characteristic of this concrete is that it has high durability and durability over time, in addition to its resistance to erosion and chemicals.
Disadvantages of high strength concrete
- The most worrying thing about this concrete is that the collapse in it is sudden because the fracture is in the aggregate and not around it, but this problem can be overcome by using fibers with the aggregate, and making a high quality control and quality control.
- Also, this concrete is crunchier than conventional.
In conclusion, I hope that this article has collected all the information related to the subject of high-resistance concrete by presenting the components involved in its production and uses, as well as its advantages, disadvantages, and the difference between it and high-performance concrete.
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