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What is the difference between Granular Sub Base (GSB) & Wet Mix Macadam (WMM) in Pavement structures?
S.Jagan
GSB is Sub-base course and mostly not considered in the main crust of the designed section of road. The prime work of GSB is drainage system and secondary to support the load transfer to the sub-grade. WMM is a part of designed road section, thickness arrived from design calculations to withstand deRead more
GSB is Sub-base course and mostly not considered in the main crust of the designed section of road. The prime work of GSB is drainage system and secondary to support the load transfer to the sub-grade.
WMM is a part of designed road section, thickness arrived from design calculations to withstand design load and ultimate transfer to sub0grade. WMM is mixed with designed proportion of aggregates and water content, laid and compacted in layers till designed thickness achieved.
The maximum aggregate size is limited to 65mm in GSB and WMM is limited to 20mm.
See lessHow to Test Quality of Steel Reinforcement at Construction Site?
Gopal Mishra
I have not seen any test being carried out at the site for testing the quality of reinforcement steel. For its quality, a lab test is required. Also the test certificate from the manufacturer can be obtained to ascertain the quality of steel.
I have not seen any test being carried out at the site for testing the quality of reinforcement steel. For its quality, a lab test is required. Also the test certificate from the manufacturer can be obtained to ascertain the quality of steel.
See lessAdmixtures in concrete for to Delay Setting Times
Gopal Mishra
Any admixtures used in concrete, it is as per the recommendations of the manufacturer. Refer to the manufacturer's specification for the quantity of admixture to be used per cubic meter of concrete to delay the setting time.
Any admixtures used in concrete, it is as per the recommendations of the manufacturer. Refer to the manufacturer’s specification for the quantity of admixture to be used per cubic meter of concrete to delay the setting time.
See lessWeight of Sand, Cement and Water for Mortar Mix Ratio 1:3
poojan
Quantity is calculated for 1 Cu.m of mortar: For 1 Cu.m mortar Cement Sand W/C ratio Remarks 1 3 0.5 Total 4 =1+3 For 1 Cu.m Considering 10% Wastage Total Quantity of wet mortar 1.1 10% of 1 Cu.m Shrinkage factor 1.25 Total Quantity of dry mortar (Wet mortar x Shrinkage factor) 1.375 Multiplying wRead more
Quantity is calculated for 1 Cu.m of mortar:
RCC issue
Madeh Izat Hamakareem
You do not need to change your steel.
You do not need to change your steel.
See lessWhat is height of instrument and Rise & fall method of levelling?
Madeh Izat Hamakareem
Height of Instrument (HI) method: consider the readings taken in the operation shown below: Reduce level can be computed using the following expression: RL of a point = HI - FS = ( RLBM +BS) - FS Arithmetic check: ΣBS - ΣFS= Last RL - first R Where: RL: Reduce Level HI: height of instrument FS: foreRead more
Height of Instrument (HI) method: consider the readings taken in the operation shown below:
Reduce level can be computed using the following expression:
RL of a point = HI – FS = ( RLBM +BS) – FS
Arithmetic check: ΣBS – ΣFS= Last RL – first R
Where:
RL: Reduce Level
HI: height of instrument
FS: foresight
BS: Back sight
BM: Bench Marks
Rise and fall (RF) method: the rise or fall of the ground between successive rod stations is considered. For the same instrument set up,
If 2nd rod reading > first rod reading ⇒ fall
If 2nd rod reading < first rod reading ⇒ rise
Then RL of 2nd station = RL of first station – fall or
RL of first station + rise
See lessConvert Cubic Meter of Laterite to Tonnes.
Gopal Mishra
For the conversion, you need to know the density of laterite which is around 1019 kg/m³. So, basically it is 1.019 tonnes per cubic meter.
For the conversion, you need to know the density of laterite which is around 1019 kg/m³. So, basically it is 1.019 tonnes per cubic meter.
See lessCan we alter the concrete mix design at site?
Gopal Mishra
In that case, you need to sieve the 10mm aggregates and use only those which pass through 12.5mm sieve. You can not alter the mix design. In other case, you need to redo the mix design based on locally available material and use the mix proportion accordingly.
In that case, you need to sieve the 10mm aggregates and use only those which pass through 12.5mm sieve. You can not alter the mix design.
In other case, you need to redo the mix design based on locally available material and use the mix proportion accordingly.
See less