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Four different types of cement use in construction

1. Four different types of cement use in construction are:

1. Rapid hardening cement.

2. General used cement.

3. Quick setting cement.

4. High sulphate resistance.

5. Air water proof oland cement

2. five different type of admixtures and outline their functions.

1. Retarding

2. Accelerating3. !ater reducing

4. Air entering admi"tures

5. #uper plastici$er 

1. Retarding% & are used to increase the set time of concrete '( slowing h(dration. )his is

especiall( use full for counteracting the effects of high temperature* which will cause concrete to

harden at a faster rate.

2. Accelerating% & works in the opposite manner from retarding admi"tures+ decreasing the set time

of concrete. )his helps to counteract the effect of cold weather+ which causes hardening at a

slower rate.

3. Water reducing% & this can 'e use to increase the set time in hot weather+ similar to retarding

admi"tures+ 'ut there main role is to allow for a more fluid mi" with lower water content.

4. Air accelerating% & are another additi,e used to enhance concretes dura'ilit( in relation to

free$e&thaw c(cle+ which is especiall( important in colder weather. )hese admi"tures disperse

small air 'u''les in the mi".

5. Air-entering admixtures% & these are also known as high&range water reducers. )hese

admi"tures can 'e used to reduce the water content of concrete '( up to 3- creating a highl(

fluid and worka'le mi".

 

The importance of curing concrete

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. !xplain the importance of curing concert%

  )his is to protect the concrete from losing its moisture thus keeping it in a reasona'le

temperature range. )he main importance is to increase the strength. /t0s also a ke( factor inmigrating cracks in the concrete+ which se,erel( impacts dura'ilit(.

a. The t"o different methods that are utili#ed in the construction industry are:

• )his is '( spra(ing water onto the formation. a simple wa( to ust keep water spra(ed onto the

sla' with garden sprinklers or '( ust hand held hose.

• Another method is '( using a plastic shield which 'asicall( a plastic laid on top of the sla' to stop

the e,aporation process. As this is one of the most effect methods of curing the concrete.

$. What is a steel frame structure

  )his is usuall( refer to as a 'uilding with a skeleton frame work of ,ertical steel column and

hori$ontal / 'eams that are constructed in a rectangular grid to support the roof+ floor and walls of a

 'uilding which are all attached to the frame work structural design.

%. Appropriate pictures illustrating each of the follo"ing:

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• Hollow&channel

• steel 'ars

• /&'eams

• &urlin

• 600 #teel 'ar

Reference

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&nformation "as gartered from internet: www.google.com 

Www.Yahoo.com

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/ would like to e"press m( special thanks of gratitude to m( teacher who ga,e me the golden opportunit(

to do this wonderful proect. #econdl( / would also like to thank the lord for gi,ing me the health and

strength and also m( friends who helped me a lot in finishing this proect within the limited time. / am

making this proect not onl( for marks 'ut to also increase m( knowledge and understand.

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 7ame% H(man Gi'son

/nstructor% 8ernard 9lliott

/nstitution% peters field :)

ourse% general construction

;e,el% 3