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What is Slag Cement? How it affect in cement property?
Nimesh Gajera
Slag is actually a by-product of the smelting process to obtain metal from raw ore. Slag cement is made by grounding blast furnace slag to proper fineness and used as a replacement of portland cement. Slag has some cementitious properties itself. Slag cement gives some extra strength, enhance resistRead more
Slag is actually a by-product of the smelting process to obtain metal from raw ore. Slag cement is made by grounding blast furnace slag to proper fineness and used as a replacement of portland cement. Slag has some cementitious properties itself. Slag cement gives some extra strength, enhance resistance to chemical attack, reduce permeability, protect rebar from corrosion. And it has some disadvantages like it reduces the initial setting time of cement.
See lessHow to conduct a soundness tests on cement?
Nimesh Gajera
The cement considers unsound if it undergoes a large change in volume (expansion) that causes cracking of hardened cement paste when it is under the condition of restraint. Apparatus Required: Le-Chateliers Apparatus, Water bath, Vernier Caliper, Weighing Scale. Procedure : 1. Place the lightly oileRead more
The cement considers unsound if it undergoes a large change in volume (expansion) that causes cracking of hardened cement paste when it is under the condition of restraint.
Apparatus Required: Le-Chateliers Apparatus, Water bath, Vernier Caliper, Weighing Scale.
Procedure :
1. Place the lightly oiled mold on a lightly oiled glass sheet and fill it with cement paste formed by gauging cement with 0.78 times the water required to give a paste of standard consistency.
2. Cover the mold with another piece of lightly oiled glass sheet, place a small weight on this covering glass sheet and immediately submerge the whole assembly in water at a temperature of 27 ± 2°C and keep there for 24 hours.
3. Measure the distance separating the indicator points to the nearest 0.5 mm. Submerge the mold again in water at the temperature prescribed above.
4. Bring the water to boiling, with the mold kept submerged, in 25 to 30 minutes, and keep it boiling for three hours. Remove the mold from the water, allow it to cool, and measure the distance between the indicator points.
5. The difference between these two measurements indicates the expansion of the cement. This must not exceed 10 mm for ordinary, rapid hardening, and low heat Portland cements. If in case the expansion is more than 10 mm as tested above, the cement is said to be unsound.
Observation And Recording:
Soundness/expansion of cement = L1-L2
See lessL1=Measurement taken after 24 hours of immersion in water at a temp. of 27 ± 20C
L2=Measurement taken after 3 hours of immersion in water at boiling temperature.
Calculate the mean of two values to the nearest 0.5 mm.
What are the properties of good building stones?
Nimesh Gajera
Hard, durable, tough, sound, and free from weathering, decay, or defects like cavities, cracks, sand holes, injurious veins, patches of loose or soft materials, etc.
Hard, durable, tough, sound, and free from weathering, decay, or defects like cavities, cracks, sand holes, injurious veins, patches of loose or soft materials, etc.
See lessWhat is the difference between capping beams and ground beams for pile?
Nimesh Gajera
There is a minor difference between ground beams and capping beams Ground Beams are provided between the pile caps, it provides structural stability and provide strength to a foundation While Capping Beams ties all piles together and helps to distribute load of superstructure to the substructure. ItRead more
There is a minor difference between ground beams and capping beams Ground Beams are provided between the pile caps, it provides structural stability and provide strength to a foundation While Capping Beams ties all piles together and helps to distribute load of superstructure to the substructure. It has the same function as pile caps, in addition to distribute the load of the superstructure.
See less