The composition of an air-entrained concrete is given below:

Water : 184 kg /m³

Ordinary Portland Cement(OPC) : 368 kg /m³

Sand : 606 kg /m³

Coarse aggregate : 1155 kg /m³

Assume the specific gravity of OPC, sand and coarse aggregate to be 3.14, 2.67 and 2.74, respectively. The air content is_________ liters/m³

Consider the following statements for air-entrained concrete:

(i) Air-entrainment reduces the water demand for a given level of workability

(ii) Use of air-entrained concrete is required in environments where cyclic freezing and thawing is expected.

Which of the following is TRUE?

A bracket plate connected to a column flange transmits a load of $$100$$ $$kN$$ as shown in the following figure. The maximum force for which the bolts should be designed is _______ $$kN$$

Two beams are connected by a linear spring as shown in the following figure. For a load $$P$$ as shown in the figure, the percentage of the applied load $$P$$ carried by the spring is ______________.