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Advancing sustainable construction: Specifying low-carbon concrete

Construction Specifier

While concrete plays an important role in creating stronger and safer buildings, this essential construction material has a large carbon footprint due to ordinary Portland cement (OPC). Compressive strength comparison of Type I/II ordinary Portland cement (OPC) and Type IL Portland Limestone Cement (PLC) produced at the Holcim Ste.

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COMPOSITION OF REACTIVE POWDER CONCRETE (RPC)

The Constructor

Portland cement – type V 1000 kg/m3 2. Portland cement – type V 955 kg/m 3 2. This compactness gives RPC ultra –high strength and durability.Reactive powder concretes have compressive strength ranging from 200 Mpa to 800Mpa. Typical composition of reactive powder concrete 800 Mpa 1. Fine sand ( 150 – 400 micron) 5001 kg/m3 3.

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STRUCTURAL USES OF PRECAST CONCRETE

The Constructor

The backing concrete is made from an ordinary mix, whereas the façade may consist of a special mix, e.g. white Portland cement. However, it is used more frequently as a non-structural decorative façade. A great variety of forms, details and colours can be produced. Precast concrete cladding is not exclusive to precast frames.

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TYPES OF CEMENT AND THEIR USES

The Constructor

Blast Furnace Slag Cement It is obtained by grinding the clinkers with about 60% slag and resembles more or less in properties of Portland cement It can used for works economic considerations is predominant. and 5 hours respectively It is used in works where concrete is subjected to high temperatures, frost, and acidic action.

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REPAIR OF POST CONCRETING DEFECTS IN STRUCTURES

The Constructor

The materials normally used for patch repairs are: Portland cement and white Portland cement: Repairs are tend to be made with a high concentration of cement which will make the finished repair appear darker than the parent concrete. White Portland cement helps to lighten the colour. Now prepare the replacement concrete.

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CELLULAR LIGHTWEIGHT CONCRETE?FLY ASH BASED

The Constructor

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CONCRETE CURING METHODS

The Constructor

This reaction, called hydration, produces a stone-like substance—the hardened cement paste.

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