Cement Testing Equipments

Cements, pozzolanas and other powdery materials, various international specifications recommend the use of "specific area" method. In the methods described below, air permeability methods are used to determine the specific surface as total surface area in cm²/g of material.

Air Permeability Apparatus Blaine Type IS: 5516 IS: 1727, IS: 4031, IS: 4825, ASTM C204, BS: 4359 Part 2, It is a variable flow type air permeability apparatus. The apparatus comprises one each of:

Permeability Cell, 12.5 mm ID

• ‘U’ Tube Manometer, mounted on stand
• Perforated Metal Disc
• Plunger
• Rubber Stopper
• Rubber TUbe 20cm long
• Filter Paper Disc
• Dibutylphthalate Liquid

The apparatus can be used for three basic tests :

• Initial drying shrinkage – The difference between the length of the cured specimen and the length when it is dried.
• Drying shrinkage - The difference between the length of the specimen from existing structure and its length when completely dried.
• Moisture movement - The difference between the length of the dried specimen and its length when again saturated with water.
• The apparatus consists of a frame with adjustable cross plate and a recessed seating and a 300 ± 1.0 mm long alloy steel reference bar having coefficient of thermal expansion less than 2x10-6deg with 6 mm dia steel balls mounted at the ends. Supplied complete, with a dial gauge 0.002 mm x 10 mm.

It consists of a stainless steel cylinder with an insulated cover, mounted on a sturdy supporting frame, enclosed in a heat insulated metal housing, attractively finished. The attached control unit encloses a sensitive pressure regulator and pressure gauge, power switches and pilot lamps for controlling the electric heating units. Inside Chamber dimensions: 15 cm dia x 60 cm height, with stainless steel Cylinder (20 kg/cm2 pressure capacity) Suitable for operation on 220 V, 50 Hz, Single Phase, AC Supply. Supplied complete with Test Bar Holder, Special Rack to hold specimens above water level in the autoclave and in a vertical position to expose them in the same manner.

Concrete moulds are easily cast by using a tamping bar or a vibrating table. However air trapped in cement mortar paste can not be thus removed while casting cement mortar moulds. Easy method is to impart greater vibrating of lesser amplitude to the mould while casting This is achieved in a vibrating machine.

Vibrating machine is used for the preparing of mortar cubes for the determination of compression strength of ordinary and rapid hardened Portland cement, low heat Portland cement, Portland blast furnace cement and high alumina cements.

A specially designed Vibration Machine is used for vibrating the mix in moulds according to strictly controlled programmer at a frequency of 12,000 ± 400 cycles per minute. The Vibrator is mounted over coiled springs and the vibrations are developed by means of a revolving eccentric shaft. The center of gravity of the vibrator, including the cube and mould, is either at the center of the eccentric shaft or within 25 mm below it. The simple design of the machine facilitates easy assembly and dismantling of the cube moulds. The machine is suitable for operation on 230 V, 50 Hz, and single-phase, AC supply. Each machine is supplied with one cube mould.

It is used for mixing cement pastes, mortars and pozzolana.

Specification :
The apparatus consists of an epicyclical type stainless steel paddle imparting both planetary and revolving motion, by means of gears. It has two speeds of 140 + 5 R.P.M. And 285 +10 R.P.M. With planetary motions of approximately 62 r.p.m, +5 R.P.M. And 125 R.P.M. +/- 10 R.P.M. Respectively. The stand of the mixer has arrangement to raise or lower the bowl. Complete with stainless steel bowl of about six liters capacity. Suitable for operation on 230 V, 50 cycles, Single Phase A.C, Supply.

This is used for determining the workability of building limes.

The flow table consists of a 30 cm dia polish steel plate with 3 engraved annular circles 7, 11 and 19cm dia. The table top is arranged for a free fall of 12.5mm by a cam action. Supplied complete with one brass conical mould, 65mm i.d. at base and 40mm i.d. at top, height of the mould 90mm.

As Entertainment of air in limited percentage improves durability of concrete and very low percentages deteriorate it, measurement of air entrapped in freshly mixed concrete becomes important. The use of chemical additices to increase workability of concrete requires an air content check to be made. Air Entertainment meters are used to determine air entertained in freshly mixed concrete by pressure method.

Specifications:
The apparatus consists of a pressure tight flanged cylindrical measuring bowl of 0.005 cubic meter capacity for maximum size of aggregate 38mm. The bowl is fitted with a removable flanged conical cover assembly with the help of a seal. The conical cover has an air valve and a pet cock for bleeding off the water. A transparent cylindrical stand pipe which is graduated in air content is fixed to the conical cover assembly. Pressure is applied to the specimen with the help of a pressure bulb and the pressure is recorded on the pressure gauge which is mounted on the stand pipe. The whole assembly is mounted on a flat base. The instrument is supplied complete with one each following accessories. Calibration cylinder with spring clamp, Trowel, Tamping rod, Straight edge, Rubber mallet and measure.