Setting time of PPC us higher than OPC. 1.Ordinary Portland Cement (OPC) is the most common cement used in the world because of its abundance and low cost of production 2.Portland Pozzolana Cement (PPC) is a variation of OPC that includes a mixture of a pozzuolanic material that can increase the strength of the concrete and reduce the amount of OPC used. Indirectly related to the initial chemical reaction of cement with water to form aluminum-silicate compound. Final setting time is that time period between the time water is added to cement and the time at which 1 mm needle makes an impression on the paste in the mould but 5 mm attachment does not make a… Determination of Standard Consistency of Cement, Final Setting Time of Cement as per IS:4031-Part 5, Initial Setting Time of Cement as per IS 4031, IS 269. Final setting time is that time period between the time water is added to cement and the time at which 1 mm needle makes an impression on the paste in the mould but 5 mm attachment does not make any impression. So that external agencies may not harm it. The minimum initial setting time is 45 minutes and maximum final setting time is 10 hrs. 1. Final setting is the time when the chemical reaction between cement and water is finished (The time at which cement completely loses its plasticity and became hard is a final setting time of cement) and for Ordinary Portland Cement, The Final Setting Time is 600 min. Final setting time is that time period between the time water is added to cement and the time at which 1 mm needle makes an impression on the paste in the mould but 5 mm attachment does not make any impression. Lower the needle gently until it comes in contact with the surface of test block and quick release, allowing it to penetrate into the test block. https://www.youtube.com/watch?v=Tnvd9OUPu3A, The fineness value of PSC when tested by Blaine’s air permeability method shall not be less than 225 m. The expansion value (i.e. Initial setting time is that time period between the time water is added to cement and time at which 1 mm square section needle fails to penetrate the cement paste, placed in the Vicat’s mould 5 mm to 7 mm from the bottom of the mould. This mean that if the initial setting time of cement is 30 minutes, the cement mortar or concrete must be placed in position within 30 minutes of adding water. If delayed, mortar or concrete will lose strength. Initial setting time test is important for transportation. Login to The Constructor to ask questions, answer people’s questions, write articles & connect with other people. Gauge time is kept between 3 to 5 minutes. Grade 43 cement is used as the most widely used general purpose cement. Iam Vishwas from Lucknow. For Ordinary Portland Cement, The Final Setting Time is 600 minutes (10hrs). HOW TO DETERMINE CONSISTENCY OF MASONRY MORTAR? Final setting time of 53 grade OPC shall not be more than 600 minutes. Cement, in general, adhesive substances of all kinds, but, in a narrower sense, the binding materials used in building and civil engineering construction. Notify me of follow-up comments by email. You can follow me on Instagram. Hot conditions provide the shortest setting times with a 100-degree day producing setting in about 100 minutes. It is also used in the finishing of all types of buildings, bridges, culverts, roads, water retaining structures, etc. B) FINAL SETTING TIME. Initial setting time shall not be less than 30 minutes and final setting time shall not be less than 600 minutes. Vicat apparatus is used, but the plunger is replaced by the steel needle in the form of a right cylinder of effective length 50 ± 1 mm and diameter 1,13 ± 0,05 mm. How to Choose Water Pumps for Construction Sites? The test is important for transportation, placing and compaction of cement concrete. Grade 53 cement is used for fast paced construction like bridges, roads, multistoried buildings and cold weather concrete. For Ordinary Portland Cement, The initial Setting Time is 30 minutes. Determination of final setting time period facilitates safe removal of scaffolding or form. 12.3.2 Setting Time Test Cement paste of standard consistence is used for this test. Difference Between OPC Cement and PPC Cement. Please enter your email address. Record this time (T 1). Become VIP Member, Do you need to remove the ads? The time taken by cement to gain its entire strength is a Final setting time of cement. Final Setting Tim: 300 min. 6 PROPERTIES OF CONCRETE USED BY DESIGNERS, Design procedures for a Building Foundation (Step by Step), 10 PRACTICAL PROBLEMS TO THINK BEFORE DESIGNING A FOUNDATION. Take 400 g of cement and prepare a neat cement paste with 0.85P of water by weight of cement. Physical requirements The specific surface (fineness) of slag cement shall not be less than 225 m2/kg Portland slag cement shall not have an expansion of more than 10 mm and 0.8 percent respectively. quickly releasing the needle after every 2 minutes till the needle fails to pierce the block for about 5 mm measured from the bottom of the mould. If not PSC then OPC is suitable ?? For construction purposes, the initial set must not be too soon and the final set must not be too late. After Performing the experiment we have concluded the results that the initial setting time of cement is 1 hr 20 mins and final setting time of cement paste is 4 hrs & 25 mins. Commonly available cements are ORDINARY PORTLAND CEMENT(OPC) 53 GRADE conforming to IS 12269, ORDINARY PORTLAND CEMENT (OPC) 43 GRADE conforming to IS 8112, PORTLAND POZZOLANA CEMENT(PPC) conforming to IS 1489(PART I) AND PORTLAND SLAG CEMENT(PSC ) conforming to IS 455. Pozzolana is an artificial or natural material which has silica in it in a reactive form. Fig 1: Vicat’s Apparatus used for determination of setting time of cement, T1 =Time at which water is first added to cement, T2 =Time when needle fails to penetrate 5 mm to 7 mm from bottom of the mould. The average compressive strength of at least 3 mortar cubes, when tested as per IS-4031-Part 6, shall be as follows. autoclave soundness test after aeration of the cement, incorporating a clause on false set of cement and permitting packaging of cement in 25 kg bags. Country And the final setting time of cement is 600 minutes or 10 hours on average for ordinary portland cement. To know more about me just visit AboutMe. Characteristic Requirement (1) (2) (3) i) Ratio of percentage of lime to percentages of silica, alumina 0.80-1.02 Fill the Vicat mould, resting on a glass plate, with the cement paste gauged as above. It is essential that cement set neither too rapidly nor too slowly. Initial setting time of 53 grade OPC shall not be less than 30 minutes. The total mass of moving part is 300 ±1 g. Gauge time is kept between 3 to 5 minutes. According to Portland Cement, Ordinary Portland Cement (GB175-1999), the national standard, the strength grades of ordinary cement can be divided into: 32.5, 32.5 R, 42.5, 42.5 R, 52.5, 52.5 R, and their ages should be no less than the numerical value in Table 4.3.The initial setting time of ordinary cement should not be earlier than 45 min, and final setting time should not be later than 10 h. Depending upon the admixtures added into the cement in the process of manufacture of cement, the setting time differs for different cement. 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