Write the procedure of vaccum dewatering concreting for construction of floors.

Write the procedure of vaccum dewatering concreting for construction of floors.
by

1 Answer

Answer :

Procedure of vaccum dewatering concreting for construction of floors: The concreting using vaccum dewatering for floor construction is done as follows. 1. Concrete is places uniformly on the spread of concrete floor and level it approximately. 2. Vibration by using suitable vibrators is applied to remove voids from concrete mass. The surface vibration is done using double beam surface vibrator. 3. Levelling of vibrated is done by using suitable straight edge. 4. The magnitude of applied vacuum is usually about 0.08 MPa and the water content is reduced by upto 20-25%. The reduction is effective upto a depth of about 100 to 150 mm only. 5. Vacuum pump is a small but strong pump of 5 to 10 HP. Water is extracted by vacuum and stored in the water separator. The mats are placed over fine filter pads, which prevent the removal of cement with water. 6. Proper control on the magnitude of the water removed is equal to the contraction in total volume of concrete. About 3% reduction in concrete layer depth takes place. 7. Finally the floating and towelling is done to achieve better finishing of surface. 

image

by

Related questions

A sand sample has a fineness modulus of 1.95. Whether this sand can be used for concreting? Explain the procedure to bring the fineness modulus in required permissible limits. State its importance.

Description : A sand sample has a fineness modulus of 1.95. Whether this sand can be used for concreting? Explain the procedure to bring the fineness modulus in required permissible limits. State its importance.

Last Answer : The given sand sample has a fineness modulus 1.95, which is less than prescribed limit i.e.2.2-3.2. It indicates that sand particles are finer, which is not suitable for satisfactory ... . Well graded sand is also useful for good bonding of particles and related strength criteria of concrete.

Consider the following activities in a building construction: 1. Concreting of roof slabs 2. Brick-jelly lime concrete terracing 3. Erection of form work for slab 4. Construction of parapet wall in terrace The correct sequence of these activities is (A) 1, 3, 2, 4 (B) 3, 1, 4, 2 (C) 3, 1, 2, 4 (D) 1, 3, 4, 2

Description : Consider the following activities in a building construction: 1. Concreting of roof slabs 2. Brick-jelly lime concrete terracing 3. Erection of form work for slab 4. Construction of parapet wall in terrace The correct sequence of these ... (B) 3, 1, 4, 2 (C) 3, 1, 2, 4 (D) 1, 3, 4, 2

Last Answer : (C) 3, 1, 2, 4

Suggest the type of cement used for the following : (i) For modular construction where form work needs to be removed early for re-use. . (ii) Mass concreting such as construction of dam. (iii) Decorative works in external surfaces of building. (iv) Cementing the oil well.

Description : Suggest the type of cement used for the following : (i) For modular construction where form work needs to be removed early for re-use. . (ii) Mass concreting such as construction of dam. (iii) Decorative works in external surfaces of building. (iv) Cementing the oil well.

Last Answer : i) For modular construction where form work needs to be removed early for reuse. – Rapid Hardening Cement ii) Mass concreting such as construction of dam. – Low heat cement. iii) Decorative works in external surfaces of building – Coloured cement. iv) Cementing the oil well. – Oil Well Cement. 

(i) Suggest the relevant method of water-proofing used for following construction. 1) Basement of buildings. 2) Swimming pool. 3) Water tank. (ii) Suggest the relevant method of transportation of concrete used for construction in following situation. 1) Concreting in hilly areas. 2) Concreting of high-rise building. 3) Concreting under water.

Description : (i) Suggest the relevant method of water-proofing used for following construction. 1) Basement of buildings. 2) Swimming pool. 3) Water tank. (ii) Suggest the relevant method of transportation of ... 1) Concreting in hilly areas. 2) Concreting of high-rise building. 3) Concreting under water.

Last Answer : Method of water-proofing for: 1) Basement of buildings: Waterproofing by using waterproof sealants. 2) Swimming pool: Waterproofing by spraying or grouting in cracks. 3) Water tank: Waterproofing by ... , concrete pump, slip form technique. 3) Concreting under water: Tremie pipe, grout pipe.

The single stage well point system of dewatering an excavation can be used if the depth of excavation does not exceed (A) 5 m (B) 10 m (C) 15 m (D) 20 m

Description : The single stage well point system of dewatering an excavation can be used if the depth of excavation does not exceed (A) 5 m (B) 10 m (C) 15 m (D) 20 m

Last Answer : Answer: Option A

If water table is encountered in the standard pit while conducting plate load test (a) The load test should be abandoned (b) The pit is considered unsafe (c) Test should be conducted with complete dewatering continuously throughout the test duration (d) The bearing capacity of soil cannot be determined in this condition

Description : If water table is encountered in the standard pit while conducting plate load test (a) The load test should be abandoned (b) The pit is considered unsafe (c) Test should be conducted ... continuously throughout the test duration (d) The bearing capacity of soil cannot be determined in this condition

Last Answer : (c) Test should be conducted with complete dewatering continuously throughout the test duration

In sequence, write concreting operations.

Description : In sequence, write concreting operations.

Last Answer : i. Batching of materials ii. Mixing of materials iii. Transportation of concrete iv. Placing of concrete v. Compaction of concrete vi. Curing of concrete vii. Finishing of concrete

Write two effects and two precautions of cold weather and hot weather concreting.

Description : Write two effects and two precautions of cold weather and hot weather concreting.

Last Answer : Effects of cold weather concreting: 1. Due to cold weather, concrete shows reduced rate of hardening, which results delay in removal of formwork. 2. Water added in concrete mix gets frozen quickly, ... heat evolution. 7. High w/c ratio and ice crystals should be used to maintain workability.

What type of angle do construction workers use when building to make sure that the walls and floors of a building are perpendicular?

Description : What type of angle do construction workers use when building to make sure that the walls and floors of a building are perpendicular?

Last Answer : They use a right angle!

Pick up the correct statement from the following: (A) The cost of square rooms is less (B) The expenditure on the foundation and roof for the double storeyed building is nearly half of that for the ground storeyed building (C) The cost of construction of a house may be minimised by restricting the height floors (D) All the above

Description : Pick up the correct statement from the following: (A) The cost of square rooms is less (B) The expenditure on the foundation and roof for the double storeyed building is nearly half of that ... cost of construction of a house may be minimised by restricting the height floors (D) All the above

Last Answer : Answer: Option D

Why are dogs afraid of vaccum cleaners?

Description : Why are dogs afraid of vaccum cleaners?

Last Answer : Its definitely due to the sound. When she is out of her cage she is more free to move around and knows she can hold her ground. That may be why she is more tolerant when out of the cage. ... trapped within the cage she is vulnerable and is defenseless so she is going to be more anxious and scared.

The velocity of light in glass is `2 xx 10^(8)ms^(-1)` while that in vaccum is `3 xx 10^(8)ms^(-1)`. By how much would an ink dot appeat to be raised

Description : The velocity of light in glass is `2 xx 10^(8)ms^(-1)` while that in vaccum is `3 xx 10^(8)ms^(-1)`. By how much would an ink dot appeat to be raised

Last Answer : The velocity of light in glass is `2 xx 10^(8)ms^(-1)` while that in vaccum is `3 xx 10^ ... raised when covered by a glass plate of 4.5 cm thickness.

Does Kirby G4/G5 Vacuum Cleaner Bags - 9 pk fits in my Eureka vaccum cleaner?

Description : Does Kirby G4/G5 Vacuum Cleaner Bags - 9 pk fits in my Eureka vaccum cleaner?

Last Answer : Unfotunately, these bags are not compatible with the Eureka model.

The speed of light will be minimum while passing through - (1) water (2) vaccum (3) air (4) glass

Description : The speed of light will be minimum while passing through - (1) water (2) vaccum (3) air (4) glass

Last Answer : (4) glass Explanation: T Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water (refractive ... 1.3; see Figure 1) and 200,000 kilometers per second in glass (refractive index of 1.5).

Sound cannot travel through ----- A. Solid B. Liquid C. Gases D. Vaccum (Answer)

Description : Sound cannot travel through ----- A. Solid B. Liquid C. Gases D. Vaccum (Answer)

Last Answer : D. Vaccum (Answer)

Assertion (A) :Sunlight reaches us without dispersion in the form of white light and not as a component. Reason(R) : Dispersion takes place due to variation of refractive index for different wavelength but in vaccum the speed of light is independent of wavelength and hence vaccum is a non- dispersive medium (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) A is false but R is true.

Description : Assertion (A) :Sunlight reaches us without dispersion in the form of white light and not as a component. Reason(R) : Dispersion takes place due to variation of refractive index for different wavelength but in vaccum the speed of ... of A. (c) A is true but R is false. (d) A is false but R is true.

Last Answer : (a) Both A and R are true and R is the correct explanation of A.

How many vaccum tubes was used in first analytical engine- 1) 10000 2) 12000 3) 90000 4) 14000

Description : How many vaccum tubes was used in first analytical engine- 1) 10000 2) 12000 3) 90000 4) 14000

Last Answer : 1) 10000

How many vaccum tubes was used in first analytical engine1 10000 2 12000 3 90000 4 14000

Description : How many vaccum tubes was used in first analytical engine 1 10000 2 12000 3 90000 4 14000

Last Answer : 1 10000

Write the procedure of construction of WBM road with neat sketch showing various components

Description : Write the procedure of construction of WBM road with neat sketch showing various components

Last Answer : Construction Procedure:  a) Preparation of Foundation: The foundation for receiving the layer of WBM may be either the sub-grade or sub-base or base course. The depressions and pot holes on the existing road ... water and rolled. No traffic is allowed till WBM layer sets and dries out. 

Write the procedure of construction of cement concrete pavement showing its components.

Description : Write the procedure of construction of cement concrete pavement showing its components. 

Last Answer : Construction procedure of Concrete Roads: 1) Preparation of subgrade by proper compaction 2) Provision of sub base to support subgrade 3) Placing of forms i.e. Steel channels 4) Batching and ... method 11) Filling of joints using joint sealers 12) Opening of traffic after cleaning

cement screed when concreting columns

Description : Hello, I was buying a concrete mix for concreting the fence posts and at home I noticed that the bags are written Cement screed BE 04/25. Can this be used or not? Thank you for the quick answers.

Last Answer : It can be used, but it won't have the right effect. At least add a little sharp, river sand to the pot. This mixture is too fine and even after curing it will have significantly less strength than conventional berton.

The grit and silt of the grit chambers, may not be used for A. Raising low lying areas by dumping B. Concreting C. Both A. and B. D. Neither A. nor B.

Description : The grit and silt of the grit chambers, may not be used for A. Raising low lying areas by dumping B. Concreting C. Both A. and B. D. Neither A. nor B.

Last Answer : ANS: B

What are the major problems in using pumping for concreting works?

Description : What are the major problems in using pumping for concreting works?

Last Answer : In pumping operation, the force exerted by pumps must overcome the friction between concrete and the pumping pipes, the weight of concrete and the pressure head when placing concrete above the ... other hand, a proper selection of aggregate grading helps to improve the pumpability of concrete.

If on­site slump test fails, should engineers allow the contractor to continue the concreting works?

Description : If on­site slump test fails, should engineers allow the contractor to continue the concreting works?

Last Answer : This is a very classical question raised by many graduate engineers. In fact, there are two schools of thought regarding this issue. The first school of thought is rather straightforward: the contractor ... t the Engineer exercise his power to stop the contractor and save these extra time and cost?

In case of laying gullies, siphons, intercepting traps, the cost includes (A) Setting and laying (B) Bed concreting (C) Connection to drains (D) All of these

Description : In case of laying gullies, siphons, intercepting traps, the cost includes (A) Setting and laying (B) Bed concreting (C) Connection to drains (D) All of these

Last Answer : (D) All of these

For concreting tunnel linings, transportation of concrete is done by (A) Pans (B) Wheel borrows (C) Containers (D) Pumps

Description : For concreting tunnel linings, transportation of concrete is done by (A) Pans (B) Wheel borrows (C) Containers (D) Pumps

Last Answer : (D) Pumps

For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be (A) 0.75 - 0.80 (B) 0.80 - 0.85 (C) 0.85 - 0.92 (D) Above 0.92

Description : For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be (A) 0.75 - 0.80 (B) 0.80 - 0.85 (C) 0.85 - 0.92 (D) Above 0.92

Last Answer : Answer: Option D

For cold weathering concreting the cement used is (a) O.P.C (b) R.H.C (c) L.H.C (d) None of these

Description : For cold weathering concreting the cement used is (a) O.P.C (b) R.H.C (c) L.H.C (d) None of these

Last Answer : (b) R.H.C

Why Should Pumping Be Not Used In Case Of Concreting Works?

Description : Why Should Pumping Be Not Used In Case Of Concreting Works?

Last Answer : Answer : During the pumping operation the pump exerted pressure must overcome any friction between the pumping pipes and the concrete, also the weight of the concrete and the pressure headwhen the ... Also if a proper selection of the aggregate grading can vastly improve the concrete pump ability.

What Are The Steps Involved In The Concreting Process, Explain?

Description : What Are The Steps Involved In The Concreting Process, Explain?

Last Answer : Answer : 1. Batching: The process of measurement of the different materials for the making of concrete is known as batching. batching is usually done in two ways: volume batching and weight batching ... performed. Compaction is generally performed in two ways: by hand or by the use of vibrators.

Bentonite is used in pile driving -- a) to facilitate pile driving b) to enable proper pile concreting c) to stabilize the bore hole walls* d) None of the above

Description : Bentonite is used in pile driving -- a) to facilitate pile driving b) to enable proper pile concreting c) to stabilize the bore hole walls* d) None of the above

Last Answer : c) to stabilize the bore hole walls*

Temporary staging for casting PSC Box Girder for a ROB over the Railway span shall be removed a) after hardening of concrete b) before hardening of concrete c) during concreting d) after stressing the cables

Description : Temporary staging for casting PSC Box Girder for a ROB over the Railway span shall be removed a) after hardening of concrete b) before hardening of concrete c) during concreting d) after stressing the cables

Last Answer : d) after stressing the cables

Explain the necessity of supervision for concreting operations.

Description : Explain the necessity of supervision for concreting operations.

Last Answer : Necessity of supervision for concreting operation: i. Supervision is necessary to complete all concreting operations in standard manner. ii. It is necessary to avoid any type of delay in concrete ... operations at each stage of project. vi. It found very effective in controlling bad workmanship.

Draw concreting operation chain in sequence.

Description : Draw concreting operation chain in sequence. 

Last Answer : Sequential chain of Concreting Operations: 

List any two precautions to be taken in cold weather concreting.

Description : List any two precautions to be taken in cold weather concreting.

Last Answer : Precautions to be taken in cold weather concreting: In extreme weather, following precautions should be taken. 1. Concreting work should be done during day time or on sunny days. 2. Warm water should ... its use. 7. Rapid hardening or quick setting cement should be used for fast setting of concrete.

Describe the procedure of water proofing used in slabs stating its importance in building construction.

Description : Describe the procedure of water proofing used in slabs stating its importance in building construction.

Last Answer : Following is the stepwise procedure effectively applied in treatment of brick bat coba.  1 All existing treatment or coating on roof slab top is initially removed and surface is cleaned by hard wire brush ... surface is marked with 300 mm false squares The curing is done on next day. 

Describe stepwise construction procedure for water bound macadam roads.

Description : Describe stepwise construction procedure for water bound macadam roads.

Last Answer : The construction procedure of W.B.M. road is discussed below: 1. Preparation of subgrade : The subgrade is prepared to the required grade and camber. 2. Preparation of the base course : After preparing ... by rolling or tamping. 5. Open to traffic : After drying, the road is opened to traffic.

Describe stepwise construction procedure of cement concrete road by continuous bay method.

Description : Describe stepwise construction procedure of cement concrete road by continuous bay method.

Last Answer : Continuous Construction method: In this method of construction, all the bays or slabs (ABCD) of strip are constructed continuously without any break as shown in figure. In this method, construction joints are, ... be diverted on the other half of the road. This method is also very rapid.

Explain the construction procedure of Bituminous Road.

Description : Explain the construction procedure of Bituminous Road.

Last Answer : The construction procedure of bituminous road is summarized as under:  1) Preparation of sub-grade - The existing ground is made clean to remove dust and other unwanted particles using ordinary and ... over thin layer of seal coat followed by necessary compaction as per camber and gradient of road.

Explain the procedure of profile leveling for construction of road.

Description : Explain the procedure of profile leveling for construction of road.

Last Answer : The operation of taking levels along the center line of any alignment at regular interval is called longitudinal or profile leveling. Along the alignment, spots are marked at regular interval along ... points are plotted against their chainage to obtain ground profile along the alignment.

Do you think photos of immigrant children crying, on floors, dead at the side of a river are going to change minds about immigration?

Description : Do you think photos of immigrant children crying, on floors, dead at the side of a river are going to change minds about immigration?

Last Answer : No, it won't change minds at all. The Trumpists and immigration hawks will say this is great - this is what should happen to all of them . The humanists will say this is awful . So ... . Repeat this over and over: This situation is all Trump's responsibility and a results of his asinine policies

What are "hand scraped" oak floors and are they more expensive than standard oak?

Description : What are "hand scraped" oak floors and are they more expensive than standard oak?

Last Answer : Hand scraped only means that the boards are designed to look as though they were cut and worked by hand.

Do you like the carpet floors manufacturers install in their vehicles, or do you wish they offed other choices, such as rubber?

Description : Do you like the carpet floors manufacturers install in their vehicles, or do you wish they offed other choices, such as rubber?

Last Answer : There was an SUV a while back that had rubber floors. You could hose it down. It was awesome, and looked good. I don't know if that vehicle is still made. I think it was a Honda, but I'm not sure. ... the floor in front of the seats in a sedan I don't think, so in some ways the mats are practical.

How do you clean your ceramic, stone or vinyl tile floors?

Description : How do you clean your ceramic, stone or vinyl tile floors?

Last Answer : I use a Swiffer mop, but instead of the disposable thingies, I use a regular washcloth soaked in about a half-vinegar, half-water solution. If you want to get fancy you can add a few drops of essential oils for a nice smell. Then I can chuck the washcloth in the laundry.

Do you prefer rubber or carpet on the floors of your vehicle?

Description : Do you prefer rubber or carpet on the floors of your vehicle?

Last Answer : We have carpet, but then we have rubber mats over the top of that.

What do you use to clean your hard wood + tile floors?

Description : What do you use to clean your hard wood + tile floors?

Last Answer : answer:My husband is a hardwood flooring installation, repair, and finishing professional with over 20 years of experience. He recommends mopping wood floors lightly with a solution of 1 part white vinegar to 3 ... a wash cloth attached to a Swiffer. Easy to rinse and reuse, then toss in the wash.

Ok- fluff x 3~ Where you live: bare wood floors, laminate or linoleum, carpeted wall to wall, or floor strewn with throw rugs and runners?

Description : Ok- fluff x 3~ Where you live: bare wood floors, laminate or linoleum, carpeted wall to wall, or floor strewn with throw rugs and runners?

Last Answer : Timber floors everywhere except for in the bathrooms and laundry. I have terracotta tiles in the family bathroom and laundry and travertine tiles in my bathroom. The images here aren’t my rooms, but the tiles are similar.

Anyone have radiant heat under tile floors in their home?

Description : Anyone have radiant heat under tile floors in their home?

Last Answer : The only one I knew of was a contractor that put it in his garage. He said if he was going to work on his equipment he was going to be warm. He also fell asleep under the equipment at times.

When you look back, what's one memory that just floors you on how times have changed?

Description : When you look back, what's one memory that just floors you on how times have changed?

Last Answer : answer:When I was seven, the kid who lived upstairs in our duplex joined me in going door-to-door around the neighborhood to shovel snow out of driveways. We got a little bit of pocket money, ... to wander out of the yard by themselves, much less inside the homes of strangers for a whole afternoon.

Hey what's SYZzling up there on the top floors of the Mansion? Must be dear SYZ!

Description : Hey what's SYZzling up there on the top floors of the Mansion? Must be dear SYZ!

Last Answer : Congrats to our resident animal expert! Nice job.