How does the setting of cement takes place & what is the role of gypsum in setting of cement ?

How does the setting of cement takes place & what is the role of gypsum in setting of cement ?
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Ans When mixed with water, the setting of cement takes place to give a hard mass. This is due to the hydration of the molecules of the constituents and their Rearrangement. The purpose of adding gypsum is only to slow down the process of setting of the cement so that it gets sufficiently hardened.
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How does the setting of cement takes place & what is the role of gypsum in setting of cement ?

Description : How does the setting of cement takes place & what is the role of gypsum in setting of cement ?

Last Answer : When mixed with water, the setting of cement takes place to give a hard mass. This is due to the hydration of the molecules of the constituents and their rearrangement. The purpose of adding gypsum is only to slow down the process of setting of the cement so that it gets sufficiently hardened. 

The addition of gypsum to portland cement helps in : (1) increasing the strength of cement (2) rapid setting of cement (3) preventing rapid setting of cement (4) reduction in the cost of cement

Description : The addition of gypsum to portland cement helps in : (1) increasing the strength of cement (2) rapid setting of cement (3) preventing rapid setting of cement (4) reduction in the cost of cement

Last Answer : preventing rapid setting of cement

Pick out the wrong statement. (A) High early strength cement are made from materials having high silica to lime ratio (B) The function of gypsum in cement is to enhance its initial setting rate (C) Acid resistant cements are known as silicate cement (D) Major component of greyish Portland cement is tricalcium silicate

Description : Pick out the wrong statement. (A) High early strength cement are made from materials having high silica to lime ratio (B) The function of gypsum in cement is to enhance its initial ... cements are known as silicate cement (D) Major component of greyish Portland cement is tricalcium silicate

Last Answer : (A) High early strength cement are made from materials having high silica to lime ratio

The function of gypsum addition during cement making is to (A) Increase the density of cement (B) Decrease the cement setting rate (C) Both (A) and (B) (D) Neither (A) nor (B)

Description : The function of gypsum addition during cement making is to (A) Increase the density of cement (B) Decrease the cement setting rate (C) Both (A) and (B) (D) Neither (A) nor (B)

Last Answer : (B) Decrease the cement setting rate

Pick out the wrong statement. (A) Dry process is used for the manufacture of cement, when the raw material is blast furnace slag (B) Portland cement is made employing wet process (C) Gypsum is added to Portland cement to lengthen its setting time (D) None of these

Description : Pick out the wrong statement. (A) Dry process is used for the manufacture of cement, when the raw material is blast furnace slag (B) Portland cement is made employing wet process (C) Gypsum is added to Portland cement to lengthen its setting time (D) None of these

Last Answer : (D) None of these

Setting time of cement increases by adding (A) Gypsum (B) Hydrogen peroxide (C) Calcium chloride (D) Sodium oxide

Description : Setting time of cement increases by adding (A) Gypsum (B) Hydrogen peroxide (C) Calcium chloride (D) Sodium oxide

Last Answer : Answer: Option A

Quick setting cement is produced by adding (A) Less amount of gypsum in very fine powdered form (B) More amount of gypsum in very fine powdered form (C) Aluminium sulphate in very fine powdered form (D) Pozzolana in very fine powdered form

Description : Quick setting cement is produced by adding (A) Less amount of gypsum in very fine powdered form (B) More amount of gypsum in very fine powdered form (C) Aluminium sulphate in very fine powdered form (D) Pozzolana in very fine powdered form

Last Answer : Answer: Option C

To retard the initial setting time of cement, the compound responsible, is (A) Tri-calcium silicate (B) Gypsum (C) Di-calcium silicate (D) Tri-calcium aluminate

Description : To retard the initial setting time of cement, the compound responsible, is (A) Tri-calcium silicate (B) Gypsum (C) Di-calcium silicate (D) Tri-calcium aluminate

Last Answer : Answer: Option B

The gypsum is added to the cement for (a) Providing high strength to the cement (b) Controlling the initial setting time of cement. (c) Lowering the clinkering temp of cement (d) All the above.

Description : The gypsum is added to the cement for (a) Providing high strength to the cement (b) Controlling the initial setting time of cement. (c) Lowering the clinkering temp of cement (d) All the above.

Last Answer : (b) Controlling the initial setting time of cement.

Setting time of cement increases by adding (i)gypsum (ii)sodium oxide (iii)calcium chloride [ A ] i [ B ] i and ii [ C ] i and iii [ D ] i, ii and iii

Description : Setting time of cement increases by adding (i)gypsum (ii)sodium oxide (iii)calcium chloride [ A ] i [ B ] i and ii [ C ] i and iii [ D ] i, ii and iii

Last Answer : [ A ] i

A slow setting cement will have higher percentage of a) tricalcium aluminate b) tricalcium silicate c) Gypsum d) Dicalcium silicate*

Description : A slow setting cement will have higher percentage of a) tricalcium aluminate b) tricalcium silicate c) Gypsum d) Dicalcium silicate*

Last Answer : C2s

Why is gypsum used in cement ?

Description : Why is gypsum used in cement ?

Last Answer : Gypsum is used to make cement slowly solidify. When the cement solidifies too fast, the amount of space inside the cement increases , the cement setting becomes weak and brittle. The use of gypsum in cement strengthens the setting of cement. As a result the cement is hard and long lasting.

Chemical composition of cement is – (1) Limestone and Clay (2) Limestone, Clay and Gypsum (3) Limestone and Gypsum (4) Clay and Gypsum

Description : Chemical composition of cement is – (1) Limestone and Clay (2) Limestone, Clay and Gypsum (3) Limestone and Gypsum (4) Clay and Gypsum

Last Answer : (2) Limestone, Clay and Gypsum Explanation: The two important raw materials used for the preparation of cement are : • Limestone : The chemical formula of limestone is CaCO3 and it is used in the manufacture of cement just to provide CaO.

Which is/ are the important raw materials in cement industry? (1) Limestone (2) Gypsum and Clay (3) Clay (4) Limestone and Clay

Description : Which is/ are the important raw materials in cement industry? (1) Limestone (2) Gypsum and Clay (3) Clay (4) Limestone and Clay

Last Answer : (4) Limestone and Clay Explanation: Limestone Claimed Clay Cement is a low-carbon alternative to the standard Portland cement. LC3 can reduce CO2 emissions related to cement manufacturing of cement by reducing the amount of clinker, replacing it with limestone and claimed clays.

Chemical composition of cement is (1) Limestone and Clay (2) Limestone, Clay and Gypsum (3) Limestone and Gypsum (4) Clay and Gypsum

Description : Chemical composition of cement is (1) Limestone and Clay (2) Limestone, Clay and Gypsum (3) Limestone and Gypsum (4) Clay and Gypsum

Last Answer :  Limestone, Clay and Gypsum

Plaster of Paris is (A) CaSO4 .½H2O (B) Used for setting of broken bones (C) Both (A) and (B) (D) Same as gypsum

Description : Plaster of Paris is (A) CaSO4 .½H2O (B) Used for setting of broken bones (C) Both (A) and (B) (D) Same as gypsum

Last Answer : (C) Both (A) and (B)

The most commonly used admixture which prolongs the setting and hardening time is (A) Gypsum (B) Calcium chloride (C) Sodium silicate (D) All of the above

Description : The most commonly used admixture which prolongs the setting and hardening time is (A) Gypsum (B) Calcium chloride (C) Sodium silicate (D) All of the above

Last Answer : (A) Gypsum

Gypsum is added for (A) Colour (B) Strength (C) Controlling setting time (D) None of these

Description : Gypsum is added for (A) Colour (B) Strength (C) Controlling setting time (D) None of these

Last Answer : Answer: Option C

What is the function of gypsum-binder in the investment:** A. Setting and hydroscopic B. Strength and rigidity

Description : What is the function of gypsum-binder in the investment:** A. Setting and hydroscopic B. Strength and rigidity

Last Answer : B. Strength and rigidity

The Most common admixture used to accelerate the initial setting of concrete is a) Gypsum b) Calcium chloride* c) Calcium carbonate d) Calcium bicarbonate

Description : The Most common admixture used to accelerate the initial setting of concrete is a) Gypsum b) Calcium chloride* c) Calcium carbonate d) Calcium bicarbonate

Last Answer : b) Calcium chloride*

Which of the following mineral is used in cement industry and plaster of paris? A. Marble B. China Clay C. Gypsum D. Fire Clay

Description : Which of the following mineral is used in cement industry and plaster of paris? A. Marble B. China Clay C. Gypsum D. Fire Clay

Last Answer : ANSWER: C

Which of the following mineral is used in cement industry and plaster of paris? A. Marble B. China Clay C. Gypsum D. Fire Clay

Description : Which of the following mineral is used in cement industry and plaster of paris? A. Marble B. China Clay C. Gypsum D. Fire Clay

Last Answer : ANSWER: C

Which one of the following is used in large quantities in Cement Industry? (1) Gypsum (2) Limestone (3) Coal (4) Clay

Description : Which one of the following is used in large quantities in Cement Industry? (1) Gypsum (2) Limestone (3) Coal (4) Clay

Last Answer : (2) Limestone Explanation: Limestone, as used by the minerals industry, is any rock composed mostly of calcium carbonate (CaCO3). Limestone is used to produce Portland cement, as aggregate ... products, making it a truly versatile commodity. Portland cement is essential to the building industry.

The addition of Gypsum to Portland cement helps in–

Description : The addition of Gypsum to Portland cement helps in–

Last Answer : Preventing rapid settling of cement

Main constituents of Portland cement are calcium aluminate and (A) Gypsum(B) Silicates(C) Sodium silicate(D) Carbonates

Description : Main constituents of Portland cement are calcium aluminate and (A) Gypsum (B) Silicates (C) Sodium silicate (D) Carbonates

Last Answer : (B) Silicates

addition of Gypsum to Portland cement helps in

Description : addition of Gypsum to Portland cement helps in

Last Answer : Preventing rapid settling of cement

Ordinary Portland cement is manufactured from (A) Lime stone and clay (B) Gypsum and lime (C) Pozzolana (D) Lime, pozzolana and clay

Description : Ordinary Portland cement is manufactured from (A) Lime stone and clay (B) Gypsum and lime (C) Pozzolana (D) Lime, pozzolana and clay

Last Answer : Answer: Option B

Which one of the following is an air binding material? (A) Gypsum (B) Acid-resistant cement (C) Quick lime (D) All of these

Description : Which one of the following is an air binding material? (A) Gypsum (B) Acid-resistant cement (C) Quick lime (D) All of these

Last Answer : Answer: Option D

Rapid hardening cement attains early strength due to (A) Larger proportion of lime grounded finer than normal cement (B) Lesser proportion of lime grounded coarser than normal cement (C) Lesser proportion of lime grounded finer than normal cement (D) Excess percentage of gypsum

Description : Rapid hardening cement attains early strength due to (A) Larger proportion of lime grounded finer than normal cement (B) Lesser proportion of lime grounded coarser than normal cement (C) Lesser proportion of lime grounded finer than normal cement (D) Excess percentage of gypsum

Last Answer : Answer: Option A

The most commonly used retarder in cement is (A) Gypsum (B) Calcium chloride (C) Calcium carbonate (D) None of the above

Description : The most commonly used retarder in cement is (A) Gypsum (B) Calcium chloride (C) Calcium carbonate (D) None of the above

Last Answer : Answer: Option A

Early attainment of strength in rapid hardening cement is mainly due to (A) Gypsum (B) Finer grinding (C) Tri-calcium silicate (D) Tri-calcium aluminate

Description : Early attainment of strength in rapid hardening cement is mainly due to (A) Gypsum (B) Finer grinding (C) Tri-calcium silicate (D) Tri-calcium aluminate

Last Answer : Answer: Option B

(3) preventing rapid setting of cement Explanation: Portland cement clinker is a hydraulic material which shall consist of at least two-thirds by mass of calcium silicates, the remainder consisting of aluminium- and ironcontaining clinker phases and other compounds. The ratio of CaO to SiO2 shall not be less than 2.0. The magnesium oxide content (MgO) shall not exceed 5.0% by mass. Cement sets when mixed with water by way of a complex series of chemical reactions still only partly understood.

Description : (3) preventing rapid setting of cement Explanation: Portland cement clinker is a hydraulic material which shall consist of at least two-thirds by mass of calcium silicates, the remainder consisting of ... mixed with water by way of a complex series of chemical reactions still only partly understood.

Last Answer : Milk is a colloidal system in which: (1) Water is dispersed in fat (2) Fat is dispersed in water (3) Fat and water are dispersed in each other (4) Fat is dissolved

Cement containing excess amount of lime – (1) cracks during setting (2) becomes more strong (3) is slow setting (4) is quick setting

Description : Cement containing excess amount of lime – (1) cracks during setting (2) becomes more strong (3) is slow setting (4) is quick setting

Last Answer : (1) cracks during setting Explanation: In cement almost entire amount of lime is present in combined state as calcium silicates and calcium aluminates. Cement containing excess amount of lime cracks during ... less amount of lime is weak in strength. Setting of cement is an exothermic process.

Cement containing excess amount of lime (1) cracks during setting (2) becomes more strong (3) is slow setting (4) is quick setting

Description : Cement containing excess amount of lime (1) cracks during setting (2) becomes more strong (3) is slow setting (4) is quick setting 

Last Answer :  cracks during setting

Can you think of any books where the setting, or most of the action, takes place in Pensacola, FL?

Description : Can you think of any books where the setting, or most of the action, takes place in Pensacola, FL?

Last Answer : Had to Google but here you go: https://www.mappit.net/bookmap/places/2762/pensacola-fl-us/ There are other lists as well.

During the process of hardening of cement, _______ will takes place [ A ] Bleeding [ B ] Segregation [ C ] Hydration [ D ] All the above

Description : During the process of hardening of cement, _______ will takes place [ A ] Bleeding [ B ] Segregation [ C ] Hydration [ D ] All the above

Last Answer : [ C ] Hydration

What is the ideal location for setting up a cement factory? In which state does cements industry have strategically located plants? -Geography

Description : What is the ideal location for setting up a cement factory? In which state does cements industry have strategically located plants? -Geography

Last Answer : Cement has various uses like for building houses, factories, bridges, roads, airports, dams and other commercial establishments. For the cement industry, bulky and heavy raw materials are required such as ... have been taken. In terms of export and production, the cement industry is doing well.

What is the ideal location for setting up a cement factory? -SST 10th

Description : What is the ideal location for setting up a cement factory? -SST 10th

Last Answer : Cement industry requires bulky and heavy raw materials like limestone, silica, alumina and gypsum. Heavy costs are involved in the haulage of the raw materials. Hence, economically, the ideal ... well in terms of production. Its export is providing the country with substantial foreign exchange.

Which substance is used to retard the setting action of cement?

Description : Which substance is used to retard the setting action of cement?

Last Answer : CaSO.2HO

Setting time of cement is controlled by adding?

Description : Setting time of cement is controlled by adding?

Last Answer : Gypsum

Setting of cement is due to the hydration of calcium silicates and?

Description : Setting of cement is due to the hydration of calcium silicates and?

Last Answer : Calcium aluminates

Cement setting under water employs a/an __________ process. (A) Hydration (B) Decomposition (C) Oxidation (D) Reduction

Description : Cement setting under water employs a/an __________ process. (A) Hydration (B) Decomposition (C) Oxidation (D) Reduction

Last Answer : (A) Hydration

Shrinkage volume in cement setting does not depend upon the (A) Sand to cement ratio (B) Water to cement ratio (C) Ambient temperature fluctuation (D) Drying period

Description : Shrinkage volume in cement setting does not depend upon the (A) Sand to cement ratio (B) Water to cement ratio (C) Ambient temperature fluctuation (D) Drying period

Last Answer : (A) Sand to cement ratio

For an ordinary Portland cement (A) Residual does not exceed 10% when sieved through IS Sieve No. 9 (B) Soundness varies from 5 to 10 mm (C) Initial setting time is not less than 30 minutes (D) Compressive stress after 7 days, is not less than 175 kg/cm2

Description : For an ordinary Portland cement (A) Residual does not exceed 10% when sieved through IS Sieve No. 9 (B) Soundness varies from 5 to 10 mm (C) Initial setting time is not less than 30 minutes (D) Compressive stress after 7 days, is not less than 175 kg/cm2

Last Answer : (C) Initial setting time is not less than 30 minutes

For quality control of Portland cement, the test essentially done is (A) Setting time (B) Tensile strength (C) Consistency (D) All the above

Description : For quality control of Portland cement, the test essentially done is (A) Setting time (B) Tensile strength (C) Consistency (D) All the above

Last Answer : D

As compared to ordinary Portland cement, high alumina cement has (A) Higher initial setting time but lower final setting time (B) Lower initial setting time but higher final setting time (C) Higher initial and final setting times (D) Lower initial and final setting times

Description : As compared to ordinary Portland cement, high alumina cement has (A) Higher initial setting time but lower final setting time (B) Lower initial setting time but higher final setting time (C) Higher initial and final setting times (D) Lower initial and final setting times

Last Answer : Answer: Option A

Tricalcium aluminate (C3A) (A) Reacts fast with water (B) Generates less heat of hydration (C) Causes initial setting and early strength of cement (D) Does not contribute to develop ultimate strength

Description : Tricalcium aluminate (C3A) (A) Reacts fast with water (B) Generates less heat of hydration (C) Causes initial setting and early strength of cement (D) Does not contribute to develop ultimate strength

Last Answer : Answer: Option B

Pick up the incorrect statement from the following: (A) The degree of grinding of cement, is called fineness (B) The process of changing cement paste into hard mass, is known as setting of cement (C) The phenomenon by virtue of which cement does not allow transmission of sound, is known as soundness of cement (D) The heat generated during chemical reaction of cement with water, is known as heat of hydration

Description : Pick up the incorrect statement from the following: (A) The degree of grinding of cement, is called fineness (B) The process of changing cement paste into hard mass, is known as setting of ... (D) The heat generated during chemical reaction of cement with water, is known as heat of hydration

Last Answer : Answer: Option C

For construction of structures in sea water, the cement generally preferred to, is (A) Portland-pozzolana cement (B) Quick setting cement (C) Low heat Portland cement (D) Rapid hardening cement

Description : For construction of structures in sea water, the cement generally preferred to, is (A) Portland-pozzolana cement (B) Quick setting cement (C) Low heat Portland cement (D) Rapid hardening cement

Last Answer : Answer: Option A

Initial setting of cement is caused due to (A) Tri-calcium silicate (B) Di-calcium silicate (C) Tri-calcium aluminate (D) Tetra calcium alumino ferrite

Description : Initial setting of cement is caused due to (A) Tri-calcium silicate (B) Di-calcium silicate (C) Tri-calcium aluminate (D) Tetra calcium alumino ferrite

Last Answer : Answer: Option C