Engineering College

An asphalt concrete mixture includes 94% aggregate by weight. The specific gravities of aggregate and asphalt are 2.65 and 1.0, respectively. If the bulk density of the mix is 147 pcf, what is the percent voids in the total mix

Answers

Answer 1

Answer:

2.0%

Explanation:

Percentage of aggregate = 94%

Specific gravity = 2.65

Specific gravity of asphalt = 1.9

Density of mix = 147pcf = 147lb/ft³

Total weight of mix: (volume = 1ft³)

= (147lb/ft³)(1ft³)

= 147lb

Percentage weight of asphalt in mix:

100% - 94%

= 6%

Weight of asphalt binders

= 6% x 147lb

= 8.82lb

Weight of aggregate in mix:

= 94% x 147

= 138.18lb

Specific weight of asphalt binder:

(Gab)(Yw)

Yw = specific Weight of water

= 62.4lb

Gab = specific gravity of asphalt binder

= 1.0

(62.4lb)(1.0)

= 62.4 lb/ft³

Volume of asphalt in binder:

8.82/62.4

= 0.14ft³

Specific weight of binder in mix:

2.65 x 62.4lb/ft³

= 165.36 lb/ft³

Volume of aggregate:

= 138.18/165.36

= 0.84ft³

Volume of void in the mix:

1ft³ - 0.84ft³ - 0.14ft³

= 0.02ft³

The percentage of void in total mix:

VTM = (0.02ft³/1ft³)100

= 2.0%

Related Questions

It is desirable to model a battery by its Thevenin equivalent. To do this, two precision resistors are used. In particular, a 25 Ohm resistor gives a 20 V drop and a 15 Ohm resistor gives a 15 V drop. The Thevenin's equivalent resistance is most nearly
1. 100 ohms
2. 75 Ohms
3. 25 Ohms
4. 15 Ohms
5. 40 Ohms

Answers

Answer:

3. 25 ohms

Explanation:

Already we are aware that

Vth = IRth + VL

RL = 25 ohms

VL = 20v

I = vL/RL

I = (20/25)A

Vth = (20/25)Rth + 20

25Vth = 20Rth + 20x25

= 25Vth - 20Rth + 500 --- (a)

RL = 15 ohms VL = 15v

I = 15/15 = 1A

Vth = 1 x Rth + 15

Vth - Rth = 15 --- (b)

When we solve equations a and b simultaneously,

Vth = 40V, Rth = 25 ohms

Therefore the answer is 25ohms.

Beginning with model year 2008, what type of communication protocol is required for diagnostics?

Answers

Controller Area Networks (CAN) have taken over. CAN technology has been steadily creeping into more and more new vehicles since it first appeared in 1992 on certain Mercedes-Benz models. Thanks to federal emissions rules, it is now required on all 2008 model year vehicles, and will be forevermore.

Beginning with model year 2008,  Controller Area Network (CAN) is required for diagnostics.

What is diagnostics?

Diagnostics are defined as the process of identifying an injury, ailment, or disease based on the symptoms and signs a person is exhibiting. In order to confirm or rule out illnesses and diseases, diagnostic tests are utilized. Before creating a treatment plan, your doctor needs particular information from a diagnostic test to make an accurate diagnosis.

The robust automotive bus standard known as a Controller Area Network (CAN) enables microcontrollers and other devices to interact with each other's applications without the need for a host computer. Devices and CAN busses are frequently found in industrial and automotive systems. Bosch created the Controller Area Network (CAN) bus, which saw its debut in manufacturing in 1991.

Thus, beginning with model year 2008,  Controller Area Network (CAN) is required for diagnostics.

To learn more about diagnostics, refer to the link below:

https://brainly.com/question/12814536

#SPJ2

Which of the following machine parts always require
guards?
Select the 3 answer options that apply.
Fan blades
Levers
Rotating barrels
Abrasive wheel machinery

Answers

Answer:fan blades, rotating , abrasive wheel machinery

Explanation:

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