PPC SUREBUILD CEM II 42,5 N - PPC SUREBUILD Cement 42,5 N with extra strength is a premium general purpose cement for building, civil engineering work, and the manufacturing of cement- based products. PPC SUREBUILD Cement 42,5 N with extra strength makes more concrete than regular 32,5 general purpose cements.
The composition of PPC SUREBUILD Cement 42,5 N varies with source factory and depends on the availability of suitable high quality extenders.
PPC OPC CEM I 52,5 N - PPC OPC Cement 52,5 N with extra strength is a Portland cement, ideal for a range of applications in the readymix, construction, precast and concrete products manufacturing industries and where early strength is required. PPC OPC Cement 52,5 N with extra strength gives more yield than regular cements. It is ideal for blending with fly ash, blast furnace slag and Saldanha slag.
Cement has a limited storage life when packed in bags. Bags are vulnerable to water vapour and will absorb moisture if exposed to rain and water. Portland cement is designed to react chemically with water and any exposure to moisture will cause it to set and harden. If cement starts to harden in the bags it should be discarded. The following building tips will help to prolong the shelf life of cement:
Handle bags carefully and, in order to reduce breakages and dust nuisance, do not walk on bags. In the event of problems with damp cement or excessive bag breakages, contact your PPC sales consultant immediately.
Mixes for concrete, mortar, plaster and sand-cement screeds are given below. These mixes assume the use of good quality aggregates and general purpose cements. As one of our building tips, we recommend crushed concrete stone from commercial sources as an aggregate. This is generally of suitable quality. Sand sources are often highly variable and should be checked if in doubt. Common problems with natural sands include:
In terms of water as an additive when mixing - and to add to your list of DIY ideas - when mixing cement, tap water is normally suitable for use as mixing water. Borehole and dam water should be checked before use. Seawater must not be used for any work of importance.
To add to your DIY ideas, below is guide to the various optimal cement mixes. These include concrete mixes, mortar for masonry, plaster and floor screed.
DIY Ideas – Extra Tip:
It is very poor practice to make a dry screed mix and finish the top surface with cement-water slurry. The cement rich top layer soon starts to crack and delaminate, compromising the sturdiness of your project. This practice should be avoided at all times.
* NHBRC guidelines
Correct batching and uniform mixing are essential to producing concrete of consistent quality. Generally speaking, in the retail cement market, materials are batched by volume and mixed by hand or in relatively small mechanical mixers.
The following building tips are therefore relevant:
Good quality sand as an aggregate in your cement mix is vital to achieving the finest quality building material. This will guarantee that your project stands the test of time.
To ensure you add only the finest quality sand to your cement mix, add the following simple sand quality test to your DIY ideas.
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