10+ RouteFabric Interview Questions and Answers

Setting time of concrete refers to the time it takes for the concrete to harden and gain strength.

• Setting time is influenced by factors like temperature, water-cement ratio, and type of cement used.

• Initial setting time is typically around 30 minutes to 1.5 hours.

• Setting time can be determined using various methods such as the Vicat apparatus or penetration resistance tests.

Fly ash and admixtures commonly used in heavy construction include Class F fly ash and water-reducing admixtures.

• Class F fly ash, which is produced from burning anthracite or bituminous coal, is commonly used in heavy construction.

• Water-reducing admixtures, such as plasticizers or superplasticizers, are often added to concrete mixes in heavy construction to improve workability and reduce water content.

• Other types of fly ash, such as Class C fly ash produced from burning ligni...read more

Quality assurance focuses on preventing defects, while quality control focuses on identifying and correcting defects.

• Quality assurance is a proactive process that involves establishing standards and procedures to prevent defects.

• Quality control is a reactive process that involves inspecting and testing products to identify and correct defects.

• Quality assurance is concerned with the overall process and system, while quality control is concerned with the individual products or ...read more

If aggregate failed in Petrography test, what are the steps to be adopted?

• Identify the cause of failure

• Check if the sample was representative

• Re-test the sample to confirm the failure

• Notify the supplier and request for replacement

• Investigate the quality control measures of the supplier

• Consider alternative sources of aggregate

Silt is harmful for concrete as it reduces its strength and durability.

• Silt particles are fine and can fill the voids in concrete, reducing its strength.

• Silt can increase the water demand of concrete, affecting its workability.

• Silt can cause segregation and bleeding in concrete, leading to poor quality.

• Silt can react with cement and other constituents, compromising the chemical reactions.

• Silt can result in a rough surface finish and reduced aesthetic appeal of concrete.

Moisture correction is calculated by adjusting the measured moisture content of a material to a standard moisture content.

• Determine the measured moisture content of the material

• Determine the standard moisture content for the material

• Calculate the moisture correction factor using the formula: MCf = (SMC - MMC) / MMC

• Apply the moisture correction factor to adjust the measured moisture content: Corrected MC = Measured MC * (1 + MCf)

During of concrete is done to ensure proper curing and strength development.

• During of concrete refers to the process of maintaining the moisture and temperature conditions for the concrete to cure properly.

• Proper curing is essential for the hydration process of cement, which leads to the development of strength and durability in concrete.

• During of concrete helps to prevent cracking, shrinkage, and surface defects.

• It allows the concrete to reach its full potential strength and...read more

RCPT stands for Rapid Chloride Permeability Test, used to measure the permeability of concrete to chloride ions.

• RCPT is a non-destructive test used to evaluate the durability of concrete.

• It measures the rate at which chloride ions penetrate the concrete.

• The test involves applying an electrical charge to the concrete sample and measuring the current flow.

• The results of the test can be used to determine the likelihood of corrosion in the concrete.

• RCPT is commonly used in the co...read more

Grading of aggregates is important for ensuring the quality and strength of concrete.

• Grading helps to ensure that the aggregates are evenly distributed in the concrete mix.

• It helps to reduce the amount of cement needed for a given strength of concrete.

• Proper grading can improve the workability and finishability of the concrete.

• It can also help to reduce the risk of cracking and shrinkage in the finished product.

• Examples of grading methods include the use of sieves or screens ...read more