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does this cement satisfy ASTM standard requirements for normal consistency
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How many wheelbarrows of cement sand and gravel in a cubic meter of concrete?
35 to 70 It depends on the mix of concrete you are using. A basic 1-2-3 mix is 5 1/2 cubic feet of portland cement (a wheelbarrow, depending on its size, holds 1/2 to 1 cubic feet), 11 cubic feet of sand, and 16 1/2 cubic feet of stone (called aggregate) from 1/2 to 1 inch in size each. To this is added about 12-15 gallons of water.(1 1/2 to 2 cu.ft.). This will make just a little less than 1 cubic meter of concrete. A weaker mix for basic work not needing structural strength a 1-2-3 mix of 1 part stone, 2 parts cement and 3 parts sand can be used, this would require a bit less than 1 part water. A stronger mix of 1 part cement, 1 1/2 parts sand and 3 parts stone with about 1/2 part water is good for heavy duty concrete work. Stone will increase the strength of concrete and sand will weaken it. Using too much or too little water in the mix will weaken it as well. Additionally, concrete with too much water or too little cement tends to shrink and crack as it sets. The amount of water to use is mainly dependent on the cement in the mix. There should be at least half as much cement as sand in any mixture. The amount of stone to use should be between 1/4 and 3/4 of the total mixture. Grouts and mortars use no stone and may add limestone as an additional binder. These should not be used for structural concrete, but can be used for foundation pointing, bolt anchoring or mortaring brickwork.
What type of motors are used in cement mixer machine?
Cement mixer machines typically use electric motors, which can be either AC or DC, depending on the design and application. Electric motors are preferred for their efficiency, low maintenance, and ability to provide consistent torque. In larger, industrial-grade mixers, diesel or petrol engines may also be used to ensure mobility and power in remote locations. Additionally, some advanced models may incorporate hydraulic motors for precise control and operation.
MQG Ball Mill?
The ball mill is widely applied in mineral classification, cement, fireproof materials, glass, pottery, chemical industry and so on. The ball mill can grind all kinds of rocks and grinding materials. There are two ways of grinding: the dry process and the wet process.
What is Spacer Die?
DVA Die Spacer is a colored, paint-on material applied to dies that adds a desired dimension to the surface of the die to function as a "spacer." The extra thickness created by the Die Spacer results in additional space between the finished restoration and the natural tooth surface to accommodate the cement used for bonding the restoration.
What is conveyor belt?
Conveyors beltIt's a mechanical machine consisting of a continuous moving belt that transports materials from one place to another place.A conveyor belt consists primarily of two or more drums, with a continuous loop of material - the conveyor belt - that rotates about them.One or both of the drums (or pulleys) are powered by motoreducer, moving the belt and the material, the other drum are free to turn being dragged from the first.The powered drum is called "drive drum" while the unpowered pulley is called the idler (or tail drum).It can be divided into two main industrial classes of belt conveyors:- Those in general material handling such as those moving boxes along inside a factory generally in indoor locations.- Those used to transport industrial bulk material handling, such as clay, grain, coal, ores, rice, etc. in indoors or outdoor locations.Generally companies providing general material handling type belt conveyors do not provide the conveyors for bulk material handling.i just know the rubber belt,which use around the conveyor,and it is to save time and money to conveying goods in many factory,like steel factory,cement factory,and mines,you know i am working in a conveyor belt factory,and i know more about the conveyor belt.if you have anyquestion,aslo can emil to me.my email address is maoxiangrubber@foxmail.com.thankyou.i will reply to you .
What will satisfy the ASTM standard requirements for normal consistency of cement?
To satisfy the ASTM standard requirements for normal consistency of cement: The Amount of Water that brings the cement paste to standard condition should vary between 22% to 30% by weight of dry cement.
Can you reuse the cement after it has crossed its setting time?
yes, if it is before the initial setting time...
What is initial Setting time?
An arbitrary division has been made for the setting time of cement as initial setting time and final setting time.It is difficult to draw a rigid line between these two arbitrary divisions.For convenience,initial setting time is regarded as the time elapsed between the moment that the water is added to the cement,to the time that the paste starts losing its plasticity.The final setting time is the time elapsed between the moment that the water is added to the cement ,and the time when the paste has completely lost its plasticity and has attained sufficient firmness to resist certain definite pressure.
What is initial setting time of cement?
It's the time from which cement starts the setting process after water is added.. Usually it is 30 min.. It can be delayed or advanced using chemicals..
What is vicat apparatus used for?
vicats apparatus is used for initial setting time of cement.
What are the factors affecting the initial setting time of cement?
When cement is mixed with water, it forms slurry which gradually becomes less plastic with the passage of time & finally a hard mass is obtained. In this process, at a certain stage when the cement paste is sufficiently rigid to withstand a definite amount of Pressure, it is said to have set & the time required to reach this stage is termed as "setting time".
What is the importance of standard consistency test?
by standard consistency test we determine standard consistency of cement which is denoted by p. as we know standard consistency value for a cement its value is used for making the paste for determining setting time, soundness, compressive strength of cement
What is standard consistency of a cement paste?
It is normal for Ordinary Portland cement to have a consistency ranging from 25-35%. To prepare cement paste of standard consistency, 25-35% of water must be added to cement. For a more detailed explanation, let us assume that a standard consistency is 30%. To make this quantity, add 30% water to 400g of cement.
What is initial and final setting time in cement according to ASTM?
Using a Vicat needle, the ASTM determined time for initial concrete setting is equal to or greater than 45 minutes. They set the final setting time is equal to or greter than 375 minutes.
What is false setting of cement?
False-setting is when cement abnormally and prematurely sets.
What type of cement speeds up concrete set time?
Rapid-setting cement, often referred to as quick-setting or fast-setting cement, is designed to accelerate the concrete set time. These types of cements contain specific additives that enhance hydration and reduce the time required for the concrete to reach initial strength. They are commonly used in applications where time is critical, such as in patching or repairs.
How gypsum effect the setting time of cement?
gypsum increase the setting time of cement.
