On a daily basis, researchers challenge and improve existing concrete strength and properties. Discuss the latest achievements in the concrete strength domain. Also, compare recent United States research accomplishments in that field with those of the rest of the world.

Is BIM a new technology, or a new process, or both? What are the promises that BIM holds to the industry? How does BIM impact the construction industry? Discuss the factors that affect the business value of BIM. Discuss the reasons that some companies still would not use BIM.

How does society resolve the debate that arises from the conflict between groups advocating building vs. removing infrastructure in the names of human needs vs. environmental needs? What role do environmental engineers play in resolving the debate?

Using the following data for an unreinforced PCC Pavement slab: ■ Design strength f′ c = 28 MPa ■ Slab thickness = 300 mm ■ Standard deviation of f′ c obtained from 20 samples = 1.4 MPa ■ Ignore any exposure requirement ■ Use air-entrained concrete ■ Fineness modulus of fine aggregate = 2.60 ■ Maximum aggregate size = 50 mm and nominal maximum aggregate size = 37.5 mm ■ Bulk oven-dry specific gravity of coarse aggregate = 2.6 ■ Oven-dry rodded density of coarse aggregate = 2002 kg/m3 Find the following: a. Required compressive strength b. w/c ratio c. Coarse aggregate amount (kg/m3 ) d. If the w/c ratio is 10% reduced, will the quantity of coarse aggregate increase, decrease or remain the same? Explain your answer.

the fourth treatment stage know as aquifer recharge, involves either holding the water at a pool from which it seeps into the underlying aquifer, or directly injecting the water into the subsurface. which of the two methods can improve the quality of water, explain in short

To what temperature (in °C) must a cylindrical rod of one metal 10.045 mm in diameter and a plate of second metal having a circular hole 9.990 mm in diameter have to be heated for the rod to just fit into the hole? Assume that the initial temperature is 25°C and that the linear expansion coefficient values for metals one and two are 4.9 x 10^-6 (°C)^-1 and 17 x 10^-6 (°C)^-1, respectively.

There are several steps in a basic level-of-service determination for an uninterrupted flow facility. Briefly define the following three facilities: 1) basic freeway 2) multilane highway and 3) two-lane highway. Furthermore, compile a table with the base conditions and steps (formulas/equations/tables) on how to determine the level of service of each of the three facilities listed above.

Design a plain concrete mix required for 400mm deep RCC beam to be constructed in New Girls Hostel at GIK Institute (you can assume workability). The specified compressive strength is 32 MPa at 28 days. The standard deviation of the concrete producer is 3.0 MPa. Select nominal maximum-size coarse aggregate from following data

1. Min. distance b/w two reinforcing bar is 40mm
2. Min. distance b/w reinforcing bar and concrete surface (clear cover) is 42mm
3. Thick of slab is 120mm
4. Concrete is not pump-able

The specific gravity of fine aggregate (FA) and coarse aggregate (C.A) are 2.5 and 2.6 respectively. The dry rodded bulk density of C.A. is 1650 kg/m3, and fineness modulus (FM) of FA is 2.70.

C.A. is found to be absorptive to the extent of 5 % and free surface moisture (moisture content) in sand is found to be 5 per cent .Assume any other essential data, concrete should be durable against sulfate and chloride attack.

Question 5 (1 point)

Match the term with the definition.

Question 5 options:

A singly reinforced beam 47.2cm×28.3cm, is provided with 5 bar of each diameter 2.2cm. determine:
1) percentage of excess steel used
2) moment of resistance
3)Actual stress develop in steel and concrete
4) maximum allowable central load that can be put if it is carrying a uniformly distributed load of 850kg/m over a simple supported length of 3.2m.

(note : we have exam right now please help please ???)

How the behavior of a SDOF is going to be affected by a non-linear elastoplastic behavior of the spring? Why?

In which stage of the industry life cycle would you place Genetic Engineering. I think Genetic Engineering is the start up stage. Why is it the start up stage?  Can you provide more detail on the start up stage.

Two systems were constructed to disinfect a raw water source. One of the systems was designed as a CSTR, the other as PER (tank divided into 3, 5m long passes using vertical baffles).The flow rate is 90 m^3/day. The influent coliform is count 100. Both tanks have a volume of 30 m^3 (H= 2m, W=3m, L=5m). Chlorine is added as the disinfectant. The disinfection rates follows a first order relationship as follows

dN/dt = kN

Where N is the number of coliforms in the systems, k is the first order disinfection constant (9/day) What is the expected coliform concentration in the effluent from each system?

A company is using an outdoor pond to get rid of some organic material in a 500 gallons/ hour wastewater stream. In the current situation, the pond which has a surface area of 1.00 acre (= 43,560 ft^2) and the average depth of 6 ft, removes of 62% of the organic material, but the company is not satisfied with this rate of removal and plans on digging a second pond to provide additional treatment of the effluent so that a total of 95% of the organics are removed from the wastewater. The company’s data indicates that, being outdoors the existing pond is subject to evaporation at the rate of 25 gallons/hour. For geographical reasons, the additional pond cannot be dug deeper than the existing pond and must therefore have a depth of no more than 6 ft. (a) Estimate the decay coefficient of the organics in the existing pond. (b) Determine the area (in acres) that the planned needs to have to enable the company to achieve its goal of 95% removal of the organics. For this assume that the second pond is place in series from the first (that is, the effluent of the first pond feeds the second pond), that the decay constant will be the same in the second pond as it presently is in the first pond, and that water loss by evaporation is proportional to the surface area of the pond.