Advantages Of Cementitious Materials

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BENEFITS AND USES OF CEMENTITIOUS MATERIALS: There are two types of cementitious materials which are hydraulic cement and supplementary cementitious material (SCMs). Hydraulic cement such as Portland cement set and harden when mix to a paste with water. Through hydration process, heat is released as the paste hardens and binds the aggregates together. SCMs such as pozzolanic materials for example: fly ash (PFA), silica fume (SF), rice husk ash (RHA), ground granulated blastfurnace slag (GGBS), palm oil fuel ash (POFA) combines with ordinary Portland cement to become a blended cement which releases less heat of hydration. BENEFITS AND USES: 1. PORTLAND CEMENT: Portland cement is the basic cementitious material that is used all around…show more content…
Silica fume combines with Portland cement to produce blended cement which possesses improved properties such as greater compressive strength and higher resistance to abrasion. This is due to the pozzolanic reaction and the addition of extreme fine powder to cement paste. Silica fume is used to make high – strength concrete. It increases cohesiveness of the fresh concrete which leads to better handling characteristics. Apart from that, silica fume improves early strength. Curing can be done earlier as silica fume lowers the bleeding process as the free water is used to wet the large surface area of the silica fume. Hence, the free water left in the mix for bleeding process is reduced. Silica fume improves durability and decreases permeability. This is due to the fine particle size and reactivity of silica fume. It improves workability as when silica fume is added, there is an introduction of large surface area in the concrete mix. Therefore, the slump loss with time is directly proportional to addition of the silica fume. Also, decrease in slump maintains the high cohesiveness of…show more content…
Silica is the basic component of sand and is used in making plaster and concrete. The fine silica will create a very dense concrete. The ash is also an excellent thermal insulator. The fine ash is suitable for sealing fine cracks in structures as it can penetrate deeper than the conventional cement sand mixture. Rice husk ash is used in making high-performance concrete and concreting the foundation. Some of the benefits of using rice husk ash are that it reduces heat of hydration as well as decrease drying shrinkage and improves durability of the concrete mix. Other than that, it decreases permeability of concrete by reducing the pore interconnectivity of concrete thus results in the increase resistance against chloride and sulphate attacks. Next, rice husk ash decreases setting time. Large surface area and higher water absorbing demand promotes faster reaction to occur. For the needed workability and strength, the water content required by rice husk ash mixed concrete was more than in normal concrete due to rice husk ash being finer than cement. This means that rice husk ash has larger surface area and water required is comparatively
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