A dedicated admixture for producing rapid repair mortar. You do not need rapid-hardening sulphoaluminate cement: batching is simply 42.5 PO / 52.5 ordinary Portland cement, clean sand and YJ-K308. Once placed, the mortar takes foot traffic at 1 hour and vehicles at 2 hours.
What it removes from your process: no sulphoaluminate cement to source, and no cocktail of separate admixtures to blend and test. One admixture, two raw materials, far fewer ways for a batch to go wrong.
Hanwang Yijia focuses on speciality cement mortars and cement-modification materials. In the field of cement early strength, strengthening, rapid setting and rapid hardening —what we call the "two strengths, two fasts" —we work with mature, industry-leading processes.
YJ-K308 is our in-house admixture developed specifically for repair mortar. It lets a dry-mix producer build a rapid repair mortar product line without buying rapid-hardening sulphoaluminate cement, and without assembling a multi-component admixture package.
Parts by weight. Treat this as a starting point and confirm it against your own materials.
| Material | Parts by weight | Notes |
|---|---|---|
| 42.5 PO / 52.5 Portland cement | 350 | Ordinary Portland cement —no sulphoaluminate cement |
| Sand | 600 | Use low-silt sand |
| YJ-K308 admixture | 50 | Adjust to control working time |
| Polypropylene fibre | 1— | Fibre length 3— mm |
The YJ-K308 dose is the lever for working time. Raise it for a faster set, lower it when the crew needs longer to place and finish. Sand silt content matters more than most producers expect —use low-silt sand.
Rapid set and rapid hardening on ordinary Portland cement. With a suitable mix, strength reaches C60 and above, and late-age strength development beats a sulphoaluminate cement system.
The mortar flows well, which keeps site work straightforward even under time pressure.
Bond performance is a standout —the repair grips the existing substrate firmly.
Micro-expansive behaviour materially lowers the risk of shrinkage cracking in the patch.
No need to blend multiple admixtures, which removes a large block of trial work and the risk of mis-batching raw materials.
Suppresses surface pulverisation, which lifts the service life of the repair.
Procurement is simpler and total cost comes in below a sulphoaluminate-based repair mortar system.
25 kg bags / 1000 kg bulk bags.
No —that is the point of the product. Ordinary 42.5 PO or 52.5 Portland cement plus low-silt sand plus YJ-K308 is the whole formulation.
Foot traffic at 1 hour after the mortar hardens, vehicle traffic at 2 hours.
C60 and above with a suitable mix proportion. Late-age strength keeps developing rather than falling back.
Yes. The YJ-K308 dose controls it —more admixture for a faster set, less when the crew needs more placing time.
It is in the reference mix at 1— parts, 3— mm length, to control plastic cracking. Tell us your application and we will advise whether to keep it.
Send us your cement grade and what you are casting. We will tell you which YJ product applies —or tell you if none of them do.