What is the strength of no-fines concrete?
between 200 to 2000 psi
The compressive strength of no-fines concrete is considerably lower than that of conventional portland cement concrete and varies between 200 to 2000 psi (1.37 to 13.73 MN/square meters ).
How do you specify no-fines concrete?
Mix-proportion of No-Fines Concrete No-fines concrete is generally made with the aggregate/cement ratio from 6 : 1 to 10 :1. Aggregates used are normally of size passing through 20 mm and retained on 10 mm.
What is no-fines concrete and its intended purpose?
Nowadays, special concrete is widely adopted in construction industry. No-fines concrete is a one of the special concrete which eliminate the use of fine aggregates in concrete mixing. The application of no-fines concrete has been introduced to construction industry especially pavement construction.
Which of the following are the disadvantages of no fines concrete?
Explanation: The compressive strength of no fines concrete varies between the ranges of 4MPa to 14 MPa. 7. Which of the following are the disadvantages of this concrete? Explanation: The main disadvantage of this concrete is that it has very low strength as compared to ordinary Portland cement.
Can you prepare concrete without using fine aggregates?
Back in India, a study carried out by the Central Road Research Institute (CRRI) has also shown that copper slag can be used as a partial replacement for sand as fine aggregate in concrete up to 40 per cent in pavement grade concrete without any loss of cohesiveness and the compressive and flexural strength of such …
What is lean mix concrete?
Lean concrete is made up of low cementitious material content. It is primarily poured through chutes, conveyor buckets, or pumps. It is used in various areas where support and strength are not critical. The mixture is highly liquid when compared to real concrete and is self-levelling, making it ideal for saving time.
Does high strength concrete have more cement?
The high strength concrete has a lower value of permeability compared to normal strength concrete. This is because the high – strength concrete is designed with lower water cement ratio. They commonly use silica fume in their mix.
What strength should concrete be at 7 days?
Compressive strength achieved by concrete at 7 days is about 65% and at 14 days is about 90% of the target strength.
What is the compressive strength of no fines concrete?
The compressive strength of no-fines concrete varies between 1.4 MPa to about 14 MPa. Table 12.5 shows the compressive strength of no-fines concrete. The bond strength of no-fines concrete is very low and, therefore, reinforcement is not used in conjunction with no-fines concrete.
What is the ratio of no fines cement to aggregate?
Water cement ratio should be chosen very carefully considering the cohesiveness of the mixture. Density of no fines concrete with normal aggregate vary from 1600 to 1900 kg/m3. When light weight aggregates are used density can be as low as 300 kg/m3. The compressive strength of no fines concrete varies between 4 MPa to 14 MPa.
What are the characteristics of no-fines concrete?
Advantages, limitations and mix proportions of no-fines concrete is discussed. Very often only single sized coarse aggregate, of size passing through 20 mm retained on 10mm is used. No-fines concrete is becoming popular because of some of the advantages it possesses over the conventional concrete.
Why is no fines concrete used in the construction of walls?
This is why it is used in the construction of external wall. Production of this type of concrete results in saving of material requirement. Due to absence of fine aggregate or sand, less amount of cement is needed to produce 1 m 3 of no fines concrete. The density of this type of concrete is about 25 to 30% less than the conventional concrete.