Summary:The fineness of Butland cement or hearthstone is determined by 150-m and 75-m sieves as the basis for judging the quality of cement or hearthstone.a.p.m.s.》In order to design the formula system, concrete friends can often operate in the community APMS system. The design ratio needs to be supported by basic test parameters, and it takes a certain amount of time to do preliminary preparation tests and accumulate statistical analysis data for the later stage. In the future, the "Mind Wisdom Quotient Mix" will be launched one by one using the "Ap.m.s.Concrete Proportioning Automatic Management System" designed and completed the proportioning standards of various materials, and the proportioning standards are completely completed by the laboratory.
Cemented material fineness test sieve analysis method by ap.m.s.The automatic management system of concrete proportioning is completed.
1.American ASTM standard sieve 150-m (No.100) or 75- m (no..)200) and one each cover and bottom, or Japanese JIS 88 (i.e. American ASTM No.170) Standard sieve one.
2.Precision electronic scale (about 1 2kg 0..)01 gram).
3.Oven. cement or hearthstone.
1.The fineness of cement and furnace stone is closely related to its setting time, sand demand and strength of mortar after hardeningThe coagulation and hardening are faster, and the water tightness, workability and appearance are better.
2.Traditionally, the standard sieving method is used for cement and furnacestone fineness testing, but in recent years, the cement and furnacestone manufacturing industry has been progressing day by day, and the fineness of cement and furnacestone has been increasing, so the traditional standard sieving method and the specifications have been too relaxed. (At present, the air permeameter method is used, and the test value is the specific surface area: cm 2 grams).
3.The fineness of cement and hearthstone is tested by standard sieve method, and the old specifications of American ASTM are No200 sieves, the residue on the sieve shall not exceed 22%, and the Japanese JIS stipulates that 88 (i.e. ASTM No..) is used170) Sieves, the residue on the sieve shall not exceed 10%. British Bs.I prescribe it with No76. When sieving, the residual amount shall not exceed 1%;With noWhen 180 sieves, the residual amount shall not exceed 10%.
4.When doing this test, whether it is a hand-cranked or shaken sieve machine (the last one still needs to be sieved by hand), it must be sieved until the throughput reaches 0 per minuteUp to 1 gram or less, the sieving time is about 10 minutes.
1.Use a copper brush to brush the mesh of the screen and put it into the electronic scale to weigh it. Take 50 grams of dry cement (which can be dried in 110 5) on a precision balance scale and place it in a sieve and cover it with a top cover.
2.Hold the sieve frame tightly with the left hand, tilt the sieve slightly downward, and then gently pat the sieve edge with the right hand from bottom to top, the slapping speed is 150 times per minute, and every 25 times (about 20 seconds) should rotate the sieve 60 ° 90 ° to make the slapping surface even. (If the cement is weathered and forms a hard block, it can be crushed in the sieve at the end of the hard rod).
3.Continue the above actions until the amount of cement and hearth passing through the standard sieve is less than 0Up to 05 grams, if it is time-based, it should be patted for about 10 minutes.
4.Take out the cement, the amount of hearth stone and the standard sieve left on the standard sieve number, and put it into the electronic scale to weigh it.