KingAdd PT50®
Free flow non-shrink grout additive for post tensioned cables.
Overview
KingAdd PT50 is a pre-packed powder consisting of selected admixtures and expansive material. The addition of Flo- Add C to grout mixes produces a high flow, non- shrink, and non-segregated grout. KingAdd PT50 reduces the water demand at the desired flow, producing high strength grout with low permeability and excellent bond to steel. The low permeability grout produced with the aid of Flo- Add C will reduce the ingress of harmful agents and will protect the cables from corrosion.
Applications
- KingAdd PT50 is ideally designed for free flow grouting in post tensioned cables used in bridges, deck ducts, etc. It is also suitable for use in cable ducts and pre-stressed structural elements
Advantages
- Will produce a non-shrink grout which is compensated for shrinkage and settlement in the plastic stage
- Will produce a high flow grout without water bleeding
- Will produce an extremely low permeability grout at low water to cement ratio
- Reduces the ingress of harmful substances
- High bond to steel
- High initial and ultimate strength
- Chloride free
- STANDARDS The use of KingAdd PT50 enables grout mixes to comply with ASTM C1107, Type A
Technical Properties
| Property | Value | Standard |
|---|---|---|
| Colour | Grey | — |
| Compressive strength | ASTM ≥ 20 MPa @ 1 day ≥ 50 | — |
| C109/109M-11 | MPa @ 7 days ≥ 60 MPa @ 28 days | — |
| Expansion characteristics | Up to 4% /C827M-10 | ASTM C827 |
| Flow characteristics | ASTM < 32 sec C939-87 within 30 min from mixing. Re-mixing is needed to keep the needed flow | — |
| Bleeding | : Pass, no bleeding | ASTM C940 |
| Addition rate | 6 kg KingAdd PT50 : 100 | — |
| kg cement | 35 ± 2 litre clean water (variable depending on cement type and source) | — |
| Fresh wet density | 2.1 ± 0.1 g/cm3 | — |
| Initial setting time | ASTM: 3 - 4 hr C191 | — |
| VOC | 10 g/ltr | — |
| Note | The results were obtained when OPC (complies with a with compressive strength @ 28 days > 42.5 MPa) is used. Higher compressive strength results can be achieved when OPC > 52.5 MPa is used. Where added water needs to be adjusted based on the mentioned range. It is important to conduct trials so as to choose the best source of OPC for the needed application. Compressive strength @ 1 day is under restrain. Compressive strength @ 7 & 28 days is under wet cure. While mixing, 6 kg of KingAdd PT50 should be added to 35 ± 2 liter of water, then slowly add the cement and mix continuously for 5 minutes until a uniform consistency is obtained. PLACING AND FINISHING In case of pumping, a suitable diaphragm pump must be used (screw and piston pump may also be suitable). The mixed grout should be pumped from one point only to eliminate air entrapment. The mixed grout should be pumped within 30 minutes of | ASTM C150-02 |
Standards & Approvals
Usage & Packaging
KingAdd PT50 is available in 6 kg bags.
Approximately 68 litre of mixed grout is obtained when mixing 6 kg KingAdd PT50, 100 kg cement and 34 liter water.
Shelf life is 1 year when stored under cover, out of direct sunlight and protected from extremes of temperature
Bag