What is the W C ratio while grouting in case of micro piling?
A rich grout of cement and fine sand with a water-cement ratio of 0.5 is used to grout the pile. The grout should have a compressive strength of a minimum of 480 kg/cm2 on 28 days.
What is micro piling in construction?
It is a drilled and grouted non-displacement pile which is heavily reinforced and carries most of its loading on the high capacity steel reinforcement • Reinforcement and cement grout are the major component of micro pile. • It also known as mini pile.
What is the difference between piles and micropiles?
A foundation is described as piled when its depth is more than three times its breadth. Micropiles are piles that have a relatively small diameter, typically in the range of 100-250 mm. They can also be described as: Minipiles (generally mini piles are smaller than micro piles)
How does micro piling work?
Hollow Bar Micropiles are drilled into the ground using a sacrificial drill/grout tip while pressurized grout is pumped down the hollow bar while drilling. Micropiles can be used for practically any soil condition, and load is gained through bond stress between the grout and the surrounding soils.
What is the grout to water ratio?
Grout-to-Water Ratio The grout to water ratio is typically 1:1. Always check the manufacturer’s directions for the grout mix you have chosen to use. Tilt the bucket at a 45-degree angle and slowly add the water in a trickle, mixing as you go.
What is micro piling technique?
Micropiles, also known as minipiles, pin piles, needle piles, and root piles, are a deep foundation element constructed using high-strength, small-diameter steel casing and/or threaded bars.
What are the advantages of micropiles?
ADVANTAGES OF MICROPILES:
- Capacity 1000kN-3000kN SLS Load.
- Ability to install in tight access installations (5ft wide) and low headroom (8ft high)
- Limited or no spoils/vibrations.
- No dewatering required – can be installed in a high water table application.
- Obstructions in soil (boulders, rubble, etc.)
How many bags of cement is 1m3?
Approximately 29 bags are required for 1m3 of cement.
How many m3 are in a bag of grout?
Typically, Volume of a bag (50lb) of grout is around 0.5 cubic feet, 14 litres, 3.75 gallons, 0.0142 cubic metre, or which is approximately equal as 0.0185 cubic yard and a bag of 25 lb yields 0.25 cubic feet, 2 gallons, 7 litres, 0.00925 cubic yard, or which is approximately equal as 0.00709 cubic metre.
What is Micropiles in ground improvement techniques?
Micropiles are deep foundation elements used for structural reinforcement between above grade structure and below grade soil structure. Micropiles (or minipiles) are small diameter, cast in place grouted columns used as load transfer elements from the supported structure above grade to the sub-soil skeleton.
Why Micropiling is done?
The main advantage of a micropile is its ability to work in very congested and low height areas and on any soil surface irrespective of its type. Micropiles are best suited for piling, retrofitting & underpinning works, slope protection, soil stabilisation, etc.
What is M20 ratio?
Different mixes (M) come in various mix proportions of the various ingredients of cement, sand and coarse aggregates. For instance, M20 comes in the respective ratio of 1:1:5:3.
What is the weight of 1 m3 concrete?
2.5 Tonnes
One cubic metre of concrete weighs 2.5 Tonnes. Typically, 1m3 of concrete is made up of 350Kg of cement, 700Kg of sand, 1,200Kg of chippings and 150 Litres of water.
What is the density of grout?
Technical Data: Type SD
| PROPERTY | TYPICAL RESULTS | STANDARDS & CONDITIONS |
|---|---|---|
| Dry Density (Specific Gravity) | 2.70 grams/cm3 | ASTM C-188 |
| Dry Weight/Wet Volume | 1.01 kg/liter | – |
| WET GROUT [SD] | ||
| Water/Grout | 0.8/1 by weight of dry grout* | – |