The most common type of cement is Portland cement, which is the basic ingredient of concrete and mortar. It is made of Portland cement clinker (calcium silicates, aluminium and other compounds) and other minor constituents. Portland cement clinker is produced by heating a mixture of raw materials up to 1450° C in a kiln. There are three production stages: preparation of the raw mixture, production of the clinker, preparation of the concrete. Limestone is the main raw material for the production of clinker, followed by sand, shale, iron ore, bauxite, fly ash and slag. About 2% gypsum is also added and then the mixture is pulverised. The resulting powder will react when water is added.

The most common type of cement is Portland cement, which is the basic ingredient of concrete and mortar. It is made of Portland cement clinker (calcium silicates, aluminium and other compounds) and other minor constituents. Portland cement clinker is produced by heating a mixture of raw materials up to 1450° C in a kiln. There are three production stages: preparation of the raw mixture, production of the clinker, preparation of the concrete. Limestone is the main raw material for the production of clinker, followed by sand, shale, iron ore, bauxite, fly ash and slag. About 2% gypsum is also added and then the mixture is pulverised. The resulting powder will react when water is added.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

Which of the following is correct for Low Heat Cement Heat of hydration is reduced by tricalcium aluminate content Suitable for use in cold weather areas Suitable for use in Hot weather areas This cement requires longer period of curing Hydration of cement is due to chemical action of water with * Tetra calcium Aluminoferrite Tricalcium silicate and Dicalcium silicate Tricalcium aluminate and Tricalcium alumino ferrite Gypsum
Reinforced concretes are usually attacked by water and rusted. This is due to, a. Low density cements or high porosity that allow water to reach the steel b. The expansion of the rust as it has higher volume than steel push the cement cover and break it c. All the options d. None of the options e. The cover thickness is too small (the steel is too close to the end of the concrete block)
Los Angeles abrasion test evaluates the aggregates' soundness and durability. Select one: O True OFalse
Q2- A concrete mix of old C(1: 1.5 : 3/0.5) (by weight) is used for casting in cold weather. Calculate: 1. The temperature of fresh concrete. 2. The temperature of heated mixing water if it is required to use to meet the specification requirements in Cold Weather (60 °F ). Assume: S.G. of aggregate = 2.65. Te = 25 °F, Ta = Tm = 20 °F
The two main raw materials needed for manufacturing ordinary portland cement are
Harmful substance in aggregate caused steel bars deterioration is O Clay O gypsum O lead salts reaction O Other:
Hydration of cement is exothermic process that generates heat. The table below shows the heat generate with different cement components. Which component is recommended to build a dam wall which is a large amount of cement block? a. None of the above b. C2S only which generate less heat and less thermal stress c. A mixture of Low heat cements to avoid thermal stress and high energy released and other factors should be considered. d. C3A because it generates large amount of heat and dry the block faster.
Which of the following materials is/are a good weight additive for cement (include both weight increase and weight reduction)? a. Bentonite b. Barite c. Hematite d. Sand e. Nitrogen
If the concrete temperature is 7 °C, how long would it take for the concrete sample to reach an age equivalent to 7 days curing at 20 °C? Apparent activation energy of the mix is 40 kj/mol and the gas constant is 8.314 j/mol-ºK. O a. 7 days O b. 15 days O c. 25 days d. 10 days O e. 3.3 days
c) If the cement manufacturer wanted to produce a white Portland cement, whatchanges would be made in terms of sourcing raw materials?The molecular weight weights of the oxide components of Portland cement are:CaO = 56; SiO2 = 60; Al2O3 = 102; Fe2O3 = 160