Precast concrete production

The work, step by step

General guidance based on the manufacturer data sheets. Site conditions differ: confirm the system with MCT before you start. Where we do not name a product, ask us and we will confirm the right one.

1. 1

   Step 1: Wet-cast elements: high early strength

   Sika ViscoCrete-20 HE is designed for precast, fast-track work and early stripping (p.1): 0.2–0.8 % of cement for medium workability, 1.0–2.0 % for SCC (p.2). SikaPlast HRM PK and Sikament R4QV PK are used as water reducers for high-early-strength precast and prestressed elements (SikaPlast HRM PK p.1; Sikament R4QV PK p.1).

   Sika ViscoCrete-20 HE Sika

   Production of concrete mixes which require high early strength development, powerful water reduction and improved flowability. (TDS p.1)

   SikaPlast HRM PK Sika Request a quotation

   SikaPlast® HRM PK can be used as a superplasticizer for the production of free-flowing concrete for: Slabs, Foundations, Walls, Columns, Piers, Slender components with dense reinforcement. (TDS p.1)

   Pack

   05 ltr jerry can

   Sikament R4QV PK Sika

   Sikament® R4QV PK can be used as a Superplasticizer for the production of free flowing concrete for: Piles, foundations, Slabs, Walls, columns, piers and slender components with dense reinforcement It is also used as a Water Reducing agent leading to high early strength concrete for:, Pre-cast co… (TDS p.1)

   Pack

   05 ltr jerry can

2. 2

   Step 2: Unreinforced items only: accelerator

   SikaRapid-786 PK gives earlier stripping and reuse of forms (p.1), but it is only for concrete without reinforcement (p.1). Dose 0.5–1.5 % of cement (p.2).

   SikaRapid-786 PK Sika

   SikaRapid®-786 PK can be used: Only for Concrete without reinforcement, Reduced water content required, For Increased early and ultimate strengths, Fast-track concrete projects, For (SCC) Self consolidating concrete, Concrete linings. (TDS p.1)

   Pack

   05 ltr jerry can 20 ltr plastic can 200 ltr drum 1000 ltr IBC Bulk supply in tanker is…

3. 3

   Step 3: Semi-dry pavers, blocks and kerbs

   SikaPaver HC-218 removes the stickiness of semi-dry mixes and gives even mould filling (p.1); dose 0.2–0.5 % of binder (p.2). For large pavers, pipes, manholes and hollow-core slabs use SikaPaver HC-339 at 0.2–0.6 % of binder (p.1, p.2).

   SikaPaver HC-218 Sika Request a quotation

   Concrete Pavers Masonry Blocks Roof Tiles Kerbstones Landscaping elements (TDS p.1)

   Pack

   Drum: 200 kg net weight IBC: 1000 kg net weight Bulk: min 6 t

   SikaPaver HC-339 Sika Request a quotation

   Large Concrete Pavers and Tiles Kerbstones and U-Stones Pipes and Manholes Hollow core slabs Railway sleepers with instant demolding (TDS p.1)

   Pack

   Drum: 200 kg net weight

4. 4

   Step 4: Colour and efflorescence control

   SikaPaver AE-500 reduces efflorescence and capillary water absorption in semi-dry precast with immediate demoulding (p.1); dose 0.2–1.0 % of binder (p.2).

   SikaPaver AE-500 Sika Request a quotation

   Paving stones with long-lasting color effect High-quality concrete tiles Garden and landscaping elements Concrete components which should be protected against rain, surface water and ascending moisture (TDS p.1)

   Pack

   Drum: 190 kg net weight

5. 5

   Step 5: Watertight and fibre-reinforced products

   For pipes, manholes and tanks, SikaControl-760 is a crystalline waterproofing admixture for structural and precast concrete (p.1). Sika Crackstop Fiber 6 mm reduces shrinkage cracking in precast elements (p.1). SikaFiber Force-60 is a structural fibre for precast; replacing steel needs an engineer's design (p.1, p.2).

   SikaControl-760 Sika

   SikaControl®-760 should be used in all structural concrete that is constantly or intermittently in contact with water such as sea walls, tunnels, basements, structural and precast concrete. SikaControl®-760 can also be used as crystalline waterproofing admixture for cement mortars and plasters. T… (TDS p.1)

   Pack

   SikaControl®-760 is available in 5 Kg & 25 kg pack.

   Sika Crackstop Fiber 6 mm Sika Request a quotation

   For most types of non-structural concrete and cementitious mortars which need to reduce the incidence of shrinkage cracking: Ground bearing slabs, Screeds and overlays, Renders and plasters, Precast concrete elements, Sprayed applications, Extruded concrete. (TDS p.1)

   SikaFiber Force-60 Sika Request a quotation

   For most types of in-situ cast structural concrete and sprayed concrete to distribute stresses, increase structural properties or increase abrasion resistance. Sprayed concrete: Excavation stabilisation in tunnelling and mining, Rock and ground stabilisation, Temporary stabilisation, Replacement … (TDS p.1)

6. 6

   Step 6: Finish, cure and dust-proof

   For exposed-aggregate faces, coat clean timber formwork with Sika Rugasol-2 W Liquid and cast within 48 hours (p.2). Sikafloor CureHard-24 is listed for dust-proofing prefabricated concrete elements (p.1).

   Sika Rugasol-2 W Liquid Sika Request a quotation

   Surface retarder when applied to horizontal fresh concrete surfaces and / or wooden formwork for: Exposed / washed aggregate concrete finishes, Architectural finishes, Screed overlays, Renderings, Rough key for subsequent works on concrete construction joints. (TDS p.1)

   Sikafloor CureHard-24 Sika Professionals only

   Horizontal old or new concrete surfaces, where a hard surface with light to moderate abrasion resistance is required e.g. (TDS p.1)

   Temperature stated in TDS

   +5 °C min. / +35 °C max (TDS p.2)

7. 7

   Step 7: Erection: grout the connections

   Grout column sockets and gaps in precast construction with a non-shrink grout (SikaGrout-114 PK p.1).

   SikaGrout-114 PK Sika

   SikaGrout®-114 PK is used for grouting in the following: Machine foundations, Columns in pre-cast construction, Concrete anchors, cavities, gaps, and recesses, Base plates, General concrete repairs, Bridge bearing pads. (TDS p.1)

Steps and product facts are taken from the manufacturer data sheets (page cited). Products are named only where the data sheet confirms the use; quantities follow a site visit or photos. General guidance: check the data sheet or ask us before you start.