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In a Pakistani summer, concrete loses slump in the truck, sets before it is finished and cracks if it dries early. Use a hot-climate superplasticiser or retarder, pour in the cooler hours and start curing straight away.
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.
Design the mix for the local cement and aggregates and run trial mixes before the job; suitability tests on the fresh concrete are required before pouring (Sika Plastiment-150 PK p.2). Do not add water on site to recover slump: excess water with a superplasticiser causes bleeding and segregation (Sika ViscoCrete-58 HT-PK p.2). Plan large pours for early morning or night.
For ready-mix and long hauls use a slump-retaining superplasticiser made for hot and tropical conditions (Sikament R4QV PK p.1; Sika ViscoCrete-3110 star PK p.1; Sikament HRM Star PK p.1). Sikament RB 918 keeps rheoplastic concrete workable for more than 2 hours at +25 °C (Sikament RB 918 p.2). Guide dosage for Sikament R4QV PK is 0.8–3 % of binder (p.2); confirm by trial.
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)
Production of site mixed and ready-mix concrete. (TDS p.1)
Ready mixed concrete Long hauls Pumped concrete Concrete containing Granulated Slag/ Pozzolans Mass concrete pours Hot weather concreting (TDS p.1)
Sikament® HRM Star PK is used wherever high-quality concrete is demanded under difficult placing and climatic conditions. (TDS p.1)
A set retarder prevents a sudden rise in concrete temperature during setting and keeps concrete workable through traffic delays (Sika Plastiretard TM 100 C2 WR PK p.1). Dose 0.2–2 % of cement; trial mixes are mandatory outside that range (p.2). Sika Plastiment-150 PK is a water-reducing retarder for high-temperature concreting at 0.3–0.8 % of binder (p.1, p.2).
Concreting in Hot Weather Plastiretard provides an effective set-retarding action that prevents a sudden rise in concrete temperature during setting. Its use becomes particularly essential: When ambient temperatures are high, In large-mass concreting works such as dams and other massive structure… (TDS p.1)
Sika® Plastiment®-150 PK is used for producing high quality concrete in applications such as: Ready mixed concrete, Fair faced concrete, High temperature concreting, Difficult placing conditions, Long transportation distances. (TDS p.1)
Add the admixture with the gauging water, never onto the dry mix. Mix wet for at least 60 seconds and add the remaining water only after two-thirds of the mixing time (Sikament R4QV PK p.2). Do not combine polycarboxylate superplasticisers with naphthalene-based admixtures (Sika ViscoCrete-58 HT-PK p.3).
Extended workability puts more pressure on formwork, so make sure it is properly installed and secured (Sika Plastiment-150 PK p.2). In slabs and screeds, Sika Crackstop Fiber 6 mm reduces plastic and drying shrinkage cracking (p.1); 600 g per m³ is the usual dose (p.2).
The right product here depends on your site. We confirm it before naming it.
Fresh concrete must be cured properly, especially at high temperatures, using a curing compound or wet hessian (Sika Plastiment-150 PK p.2). On slabs, spray a curing compound immediately after finishing (Sikafloor ProSeal W p.3). These compounds are applied at +10 °C to +30 °C and stored in a cool place above +25 °C (Sikafloor ProSeal W p.2), so spray in the cooler hours or use wet hessian and polythene.
The right product here depends on your site. We confirm it before naming it.
A starting point for a site proposal. Quantities, prices and the final specification follow a site visit or photos.
| Step | Product | Pack | Source |
|---|---|---|---|
| 2. Choose a hot-climate superplasticiser | Sikament R4QV PK | 05 ltr jerry can | TDS p.1 · June 2025, Version 02.01 |
| 2. Choose a hot-climate superplasticiser | Sika ViscoCrete-3110 star PK | 05 ltr jerry can | TDS p.1 · January 2026, Version 01.01 |
| 2. Choose a hot-climate superplasticiser | Sikament RB 918 | 05 ltr jerry can 20 ltr plastic can 235 ltr drum 1000 ltr IBC Bulk supply in tanker is… | TDS p.1 · June 2025, Version 03.01 |
| 2. Choose a hot-climate superplasticiser | Sikament HRM Star PK | 05 ltr jerry can | TDS p.1 · June 2025, Version 03.01 |
| 3. Add retardation for long hauls and big pours | Sika Plastiretard TM 100 C2 WR PK | 05 ltr jerry can | TDS p.1 · August 2026, Version 01.01 |
| 3. Add retardation for long hauls and big pours | Sika Plastiment-150 PK | 05 ltr jerry can | TDS p.1 · June 2025, Version 02.01 |
No. Excess water with a superplasticiser causes bleeding or segregation (Sika ViscoCrete-58 HT-PK p.2). Use a slump-retaining admixture so the concrete stays workable without extra water (Sikament R4QV PK p.1).
Sikament RB 918 keeps rheoplastic concrete workable for more than 2 hours at +25 °C; the loss depends on temperature, cement, aggregates and transport (Sikament RB 918 p.2). Confirm with a trial at your plant.
No. The TDS states that Plastiretard improves mechanical strength development and reduces shrinkage and creep (Sika Plastiretard TM 100 C2 WR PK p.1). Overdosing extends setting, so keep the concrete moist during that time (Sika Plastiment-150 PK p.2).
The curing compounds on file are applied at +10 °C to +30 °C (Sikafloor ProSeal W p.2; Sikafloor ProSeal-22 p.2). In hotter hours use wet hessian and polythene, which the admixture data sheets also accept (Sika Plastiment-150 PK p.2).
No. Crackstop fibres reduce the tendency for plastic and drying shrinkage cracking (Sika Crackstop Fiber 6 mm p.1), but the concrete must still be cured (Sika Plastiment-150 PK p.2).
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.