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Directions for using REINforced Cement

REINforced cement will provide an exceptionally effective and durable material if these simple directions are followed.

General

These recommendations are in addition to good building practise. Portland cements harden by chemically reacting with water. It is, therefore, desirable to prevent premature dying out of the material after application. Damp down porous backgrounds; try to avoid very drying conditions, (hot sun and high winds). Overlap the material as it is applied; do not apply as a series of separate strips. Where horizontal lift joints occur, these must be overlapped.

No additives are required with REINforced cement and none should, therefore be used. The surface to which the REINforced cement is to be applied should be suitable. Where necessary a waterproof bonding agent should be used.

Proportioning the Mix

In accordance with normal practise, the sand and cement are batched by volume using two parts of ordinary, clean, soft building sand (to B.S.1200) to one part cement. Fibres are added at between 25 and 30grms per Kg of cement used.

For simplicity, we recommend you use a clearly marked two gallon (9 Litre) bucket. For each bucketful of cement, add at least 250grms of fibres (do not consolidate the cement, leave as poured). A suitable mix for a small mixer would consist of 4 buckets of sand, 2 buckets of cement, with at least 500grms (1/2kg) fibres. 

Mixing

The sand, cement and water are first thoroughly mixed, and then the fibres are slowly added with additional water as necessary. Thorough mixing, to uniformly distribute the fibres throughout the mix, is essential. REIN fibres are not liable to damage by extended mixing. Only sufficient water should be added to give the desired degree of workability – excessive water is deleterious and should be avoided. The quantity mixed per batch should be based on the amount which can be used within the 45 minutes of mixing.

Finishing of reinforced cement

REINforced cement provides an ideal base coat for most conventional applied finishes, such as dry dash, wet dash, Tyrolean, etc. Unlike conventional base coats, which must be allowed to dry and crack before subsequent coats are applied, REINforced cement allows these finishing coats to be applied in about 24 hours, depending on weather conditions, giving the substantial benefit of allowing the work to proceed without interruption. It is undesirable to delay the application of additional coats too long, as REINforced cement provides such an impermeable surface when fully hardened that the suction is too low to provide a good bond for subsequent coats without a bonding agent. An attractive textured finish is easily obtained on REINforced cement using a texturing roller. If a textured finish is to be applied, it is essential to adequately control the suction of the background to prevent water being drawn from material before it is textured. White cement and cement colours, complying with BS1014 can be used to give a durable self finish, requiring no decoration and is ideal for flooring. Lighter shades are recommended, as they are less likely to create problems in consistency and fading or blooming of the surface. Protruding fibres can be removed by lightly singeing with a blowtorch after the cement has cured.

Estimating Quantities

REIN fibres are generally supplied in packs which are sufficient for 10sqm of rendering at 5mm thick, allowing a margin of approx 20%. For each pack (i.e. 10sqm of rendering) you will require approximately 33kg cement for 67kg sand, a total of 100kg. A 50kg bag of cement, with two bags of sand will be sufficient for 15sqm of 5mm thick REINforced mortar.

Dry block walling

The blocks are laid dry, once the base course and DPC are laid conventionally with mortar joints. Hollow concrete blocks of 150mm thickness give excellent stability, although 100mm blocks can be used. If horizontal joints in the rendering are necessary, these must coincide with the middle of the middle of the course of blocks. Blocks are laid with a broken vertical bond as in conventional practise. Supporting pillars, lintels etc are as for conventional practise. This system of building should only be employed up to single story height.