Entries by Hannah Wangui

What raw material of Portland cement provides the source of aluminum for the formation of C3A?

December 7, 2020 in /by

Question 1a) What raw material of Portland cement provides the source of aluminum for the formation of C3A? b) The production of portland cement is responsible for 6% of the world’s CO2 generation. Describe the two sources for the production of CO2 during the firing of the clinker in the kiln. c) One of the major […]

 

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You are going to cast concrete in a site during a very hot summer. The local market has the two cements available:

December 7, 2020 in /by

Question 4: You are going to cast concrete in a site during a very hot summer. The local market has the two cements available: Cement A (%): C3S= 50, C2S= 35, C3A= 5, C4AF= 10 Cement B (%): C3S = 65, C2S= 15, C3A= 10, C4AF= 10 Which cement should you select? Question 5: At […]

 

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You are going to cast concrete in a site during a very hot summer.

December 7, 2020 in /by

Q1) You are going to cast concrete in a site during a very hot summer. The local market has the two cements available: Cement A (%): C3S= 50, C2S= 35, C3A= 5, C4AF= 10 Cement B (%): C3S = 65, C2S= 15, C3A= 10, C4AF= 10 Which cement should you select? Q2) Compute the water/cement […]

 

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You are building a structure in Arizona during the summer. You notice that the aggregate stockpile is exposed to the sun and that the material is quite dry

December 7, 2020 in /by

<br/><br/>Question 1: You are building a structure in Arizona during the summer. You notice that the aggregate stockpile is exposed to the sun and that the material is quite dry. (a) should you be concerned that the dry aggregate “sucks” the mixing water from the fresh concrete? (b) what procedures would you recommend to do […]

 

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