Answer / wer

^The process of selecting suitable ingredients of concrete and determining their relative amounts with the objective of producing a concrete of the required, strength, durability, and workability as economically as possible, is termed the concrete mix design. 




^Requirements of concrete mix design: 




The requirements which form the basis of selection and proportioning of mix ingredients are : 




a ) The minimum compressive strength required from structural consideration 




b) The adequate workability necessary for full compaction with the compacting equipment available. 




c) Maximum water-cement ratio and/or maximum cement content to give adequate durability for the particular site conditions 




d) Maximum cement content to avoid shrinkage cracking due to temperature cycle in mass concrete. 




^Standard mixes: 




The nominal mixes of fixed cement-aggregate ratio (by volume) vary widely in strength and may result in under- or over-rich mixes. For this reason, the minimum compressive strength has been included in many specifications. These mixes are termed standard mixes. 




IS 456-2000 has designated the concrete mixes into a number of grades as M10, M15, M20, M25, M30, M35 and M40. In this designation the letter M refers to the mix and the number to the specified 28 day cube strength of mix in N/mm2. The mixes of grades M10, M15, M20 and M25 correspond approximately to the mix proportions (1:3:6), (1:2:4), (1:1.5:3) and (1:1:2) respectively. 

How much percentage of silt contain maximum allowed?

5 Answers   ACC,

---

you are a civil engineering student so what you have done to improve your knowdge

8 Answers   Infosys,

---

What is the mix propotion of M10,M15,M20,M25,M30,M40,M50.M60 cement content,aggrigate,sand and water ratio.

0 Answers   L&T,

---

Where hinge support is used in residential building?

2 Answers  

---

The difference between Centering & Shuttering is –––

6 Answers   UIPL,

---

One unit equal to how many brick

3 Answers   Sainath Infrastructure,

---

How do You Maintain a structure after getting cube test of low strength.

0 Answers   L&T, Meinhardt,

---

cinder filling or Brick Aggregate filling in sunken portion.which one is better

1 Answers   Chenab Valley Power Projects,

---

Why shoring is employed in building industry?

1 Answers  

---

What are the tests on concrete?

1 Answers  

---

What do you mean by the word 'shear'?

1 Answers  

---

Special thing in designing a overhead reservoir ? which is different from an ordinary design

0 Answers  

---