Q. Chemically active pore fillers __________ the setting of concrete.

View solution

Q. Chemically inactive pore fillers __________ the workability.

View solution

Q. Water repelling materials like soda, potash soaps, etc make the concrete pervious.

View solution

Q. Entrapped air normally exists in the form of relatively __________ air voids.

View solution

Q. What are plasticizers?

View solution

Q. Which one is an anionic surfactants?

View solution

Q. What is the amount used of plasticizers in cement by weight?

View solution

Q. What is the limitation of plasticizers?

View solution

Q. At constant workability, what is the reduction in mixing water?

View solution

Q. Where do we use plasticizers?

View solution

Q. What is super plasticizers?

View solution

Q. What is the allowed reduction of water with super plasticizers without reducing workability?

View solution

Q. Is it possible to use w/c ratio as low as 5?

View solution

Q. What is the limitation of Carboxylic acids in High range water reducers?

View solution

Q. What is accelerator?

View solution

Q. What is retender?

View solution

Q. NaOH is the example of retenders.

View solution

Q. Zinc is the example of retenders.

View solution

Q. Retarders are used to ___________

View solution

Q. At normal temperatures addition of sugar _____________ per cent have little effect on the rate of hydration.

View solution