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Frequently Asked Questions

What is concrete?

Concrete is a mixture of portland cement (10-15%) and water (15-20%) make a paste. This paste is then mixed with aggregates (65-75%) such as sand and gravel, or crushed stone. As the cement and water mix, they harden and bind the aggregates into an impenetrable rock-like mass.

What is concrete and types?

Concrete is a composite building material made by combining cement (usually Portland cement), water, coarse aggregates, and fine aggregates. From airport runways and bridges to patios and roadways, concrete is an essential component of residential and commercial construction across the world

Why is concrete used?

Concrete is used to provide strength, durability, and versatility during the construction of a structure. These excellent properties have made concrete a reliable and long-lasting choice of construction companies for both commercial and domestic types of constructions.

What is concrete and properties of concrete?

Concrete is a complex material that consists of lime or cement (binding material) along with sand, gravel, stone, etc. (aggregates), admixtures, and water in definite proportions. Several properties of concrete are dependent on the proportions of mixing.

What is the strength property of concrete?

Usually, the compressive strength of concrete varies from 2500 psi (17 MPa) to 4000 psi (28 MPa) and higher in residential and commercial structures. Several applications also utilize strengths greater than 10,000 psi

Why is concrete called concrete?

The word concrete comes from the Latin word "concretus" (meaning compact or condensed), the perfect passive participle of "concrescere", from "con-" (together) and "crescere" (to grow).

What is special about concrete?

Concrete is renowned for its high strength. The degree of strength can be adapted to meet the needs of a specific project by altering the water, cement and aggregate ratio. Remarkably, concrete strengthens year by year – this is due to the cement component's ability to form bonds with surrounding moisture particles

Who is the father of concrete?

William Aspdin (23 September 1815 – 11 April 1864) was an English cement manufacturer, and a pioneer of the Portland cement industry. He is considered the inventor of "modern" Portland cement.

Is concrete basic or acidic?

Portland cement, concrete's binding agent, has a pH of 11, making it alkaline. For cement to effectively hold the various components within it, it should have a pH of around 11

Who introduced concrete?

Modern concrete is due to the invention of Portland Cement in 1824 by Joseph Aspdin.

Which country first invented concrete?

6500BC – UAE: The earliest recordings of concrete structures date back to 6500BC by the Nabataea traders in regions of Syria and Jordan. They created concrete floors, housing structures, and underground cisterns. 3000 BC – Egypt and China: Egyptians used mud mixed with straw to bind dried bricks

When was concrete first used in India?

India entered into the Cement Era in 1914, when the Indian Cement Company Ltd. started manufacturing Cement in Porbundar in Gujarat. However, even before that a small cement factory was established in Madras in 1904 by a company named South India Industrial Ltd.

What makes concrete harden?

The water causes the hardening of concrete through a process called hydration. Hydration is a chemical reaction in which the major compounds in cement form chemical bonds with water molecules and become hydrates or hydration products.

What is the weakness of concrete?

Concrete has excellent compression strength but weak tensile strength. For coatings application concrete is considered a weak substrate compared to metallic substrates. Steel surfaces have high tensile strength are nonporous and uniform. The tensile strength of concrete is approximately 10% of its compressive strength.

Where is the oldest concrete?

One of the first forms of concrete used that still exists today can be found in the Pyramids at Giza, Egypt, which were built around 3,000 BC.

Who invented the ancient concrete?

The recipe for Roman concrete was described around 30 B.C. by Marcus Vitruvius Pollio, an engineer for Octavian, who became Emperor Augustus. The not-so-secret ingredient is volcanic ash, which Romans combined with lime to form mortar. They packed this mortar and rock chunks into wooden molds immersed in seawater.

Which is the first concrete road in India?

The first concrete road in India was built in Chennai by the British in 1914. But even decades later, there are only a few stretches in the city that are laid with concrete

What is curing of concrete?

Curing is the process of maintaining satisfactory temperature and moisture conditions in concrete long enough for hydration to develop the desired concrete properties. The potential strength and durability of concrete will be fully developed only if concrete is properly cured.

What can damage concrete?

Chemical attack, overloading and impact, carbonation, dry and wet cycling, and fire are major causes of concrete damages.

How thick is concrete?

Most specifications for retail or commercial concrete slabs specify 4 to 6 inches of thickness

What is the full form of RCC?

RCC stands for Reinforced Cement Concrete. This concrete is made of cement, coarse gravel and water and steel or iron bars helps in reforcing the materials mentioned before. The steel or bars get embedded in the concrete and it makes the construction super strong and durable.

What is the age of concrete?

Concrete age is the time since the moment water is added to the cement, and the age of concrete comprehensively reflects the physical properties of the concrete when curing under standard conditions

Does concrete weaken over time?

Concrete is one of most durable manmade materials, but even this old industry workhorse has its weaknesses. Exposure to harsh weather, reactions with common elements, and poor construction can all lead to concrete failure

What is difference between concrete and cement?

The terms cement and concrete often are used interchangeably, cement is actually an ingredient of concrete. Concrete is a mixture of aggregates and paste. The aggregates are sand and gravel or crushed stone; the paste is water and portland cement.

What is workability in concrete?

Workability of Concrete is a broad and subjective term describing how easily freshly mixed concrete can be mixed, placed, consolidated, and finished with minimal loss of homogeneity.

What is the curing period of Reinforced Concrete?

It is also recommended that the curing duration should not be less than 10 days for concrete exposed to dry and hot conditions and 14 days for concrete with mineral admixture.

Is concrete harmful to soil?

Concrete is not actually toxic and is not toxic to plants. That said, concrete can potentially be harmful to some plants. The reason for this is because concrete contains lime which is highly alkaline. Many plants can't thrive in soil that has high alkalinity and instead need soil that is more acidic.

Can water damage concrete?

Despite being an incredibly durable material, concrete can be susceptible to damage, especially water damage. Concrete is porous and can absorb water, which can lead to cracking. This can allow water to travel further into a foundation which can lead to structural damage.

What is creep in concrete?

Definition: time-dependent deformation due to sustained load.- ACI Concrete Terminology. Creep is indicated when strain in a solid increases with time while the stress producing the strain is kept constant.

What is the bleeding of concrete?

Bleeding described as the separation of water from a concrete mix due to gravitational settlement of the solid materials was recognized many years ago as a form of segregation, the excessive occurrence of which leads to laitance, green shrinkage, sand streaking, non-uniformity of strength, water gain voids under aggregate with consequent increased transverse permeability and cold weak joints between successive courses of placed concrete

What is workability in concrete?

Workability of Concrete is a broad and subjective term describing how easily freshly mixed concrete can be mixed, placed, consolidated, and finished with minimal loss of homogeneity.

What is broken concrete called?

Crushed concrete, also known as recycled concrete aggregate (RCA), consists of debris, fragments, and chunks of broken waste concrete and crushed asphalt. Waste concrete is typically sourced from demolition sites, such as roads, parking lots, concrete blocks, structural elements, and other demolition projects.

What is cracking of concrete?

Definition: a complete or incomplete separation of either concrete or masonry into two or more parts produced by breaking or fracturing.- ACI Concrete Terminology. Cracks are categorized as occurring either in plastic concrete or hardened concrete.

Why is concrete called artificial stone?

Artificial stone is called a building material that replaces the natural stone surfaces at external and internal walls. The artificial stones are produced with lightweight aggregates in order to have little weight compared to natural stones.

What is shelf life of concrete?

The storage of cement is recommended for 30 days, which may increase this period by up to 60 days depending on weather conditions [3], as the expiration date is 90 days according to NBR 16,697

how much area 1 cubic meter concrete covers?

It depends on the length, width & thickness of the slab. For calculating the actual quantity we have concrete calculator on our website homepage.

Which grade of concrete to be used for construction purpose?

Concrete is divided into different grades according to their applications, for which we have concrete mix grade chart on our home page.

What is the cost of one cubic meter concrete?

It's important to notice here that as the Grade of Concrete Mix increases , rate of concrete also raises accordingly. The price of RMC will be differ based on the Concrete Grade, cement type and the location.

What is weight of one cubic meter concrete?

For normal concrete, the weight of a cube of one cubic metre is between 2,000 and 2,600 kg.

When Can You Drive on New Concrete?

you’ll be able to drive and park on a new concrete driveway seven days after placement. By that time, your concrete will have attained about 70% of its potential strength. Still, you’ll need to take some precautions until the concrete has reached full strength. Before driving or parking heavier vehicles on the driveway, like RVs and large trucks, you should wait at least 28 days. Also avoid driving near or across the edges of the driveway, since those areas are more vulnerable to damage.

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