Master Builders Solutions MasterRoc TCC 735
A chloride-free liquid admixture built for sprayed concrete — tighter cement hydration means denser shotcrete, better bond to rock, and smoother pumping on tunnel and mining faces.
What is it?
A chloride-free, multi-purpose liquid admixture that improves the pumpability, hydration and hardened-state performance of sprayed (shotcrete) and cast concrete.
Where is it used?
Tunnel linings, underground mining support, rock-slope stabilisation shotcrete, and any low-cement or hot-climate concrete needing better cohesion and pumpability.
Why use it?
It tightens cement hydration so concrete gains density, bond and compressive strength faster, while cutting early shrinkage and permeability — without introducing chlorides.
How is it applied?
Dosed into the mix at the batching plant as part of an engineered mix design (rate set by project trial mix); drums are stirred or rolled before use, then the concrete is wet-sprayed or cast and vibrated as normal.
About Master Builders Solutions MasterRoc TCC 735
MasterRoc TCC 735 is Master Builders Solutions’ multi-purpose liquid admixture from the MasterRoc range — the same underground-construction product family that supplies India’s tunnel, metro and hydropower shotcrete crews with accelerators, fibres and pumping aids. Unlike a conventional superplasticizer that simply disperses water around cement grains, TCC 735 is formulated to act on the hydration chemistry itself. The manufacturer describes it as improving cement hydration so that both the plastic (freshly sprayed) and hardened states of the concrete perform better: smoother pumping and less rebound off the nozzle, followed by denser, stronger, less permeable shotcrete once it sets. It ships as a milky-white liquid, is completely chloride-free, and is compatible with ordinary Portland cement, PPC, PSC, microsilica and other pozzolanic additions — which is what makes it workable across the varied cement sources Indian batching plants actually draw on.
What earns it a place on Space Arc’s admixture shelf rather than being treated as a generic plasticizer is the specific problem it is built to solve: sprayed concrete with a lean cement content, aggregate that isn’t perfectly graded, or a hot-climate pour where slump falls apart before the nozzle operator finishes a panel. TCC 735 holds that mix together — improving cohesion and pumpability without the flash-set risk of an over-dosed accelerator, and without introducing chlorides that would put reinforcement or rock bolts at corrosion risk. It is a specifier’s product, not a shelf commodity: dosed at the batching plant as part of an engineered mix design, alongside — not instead of — MasterRoc’s accelerator and fibre lines. Space Arc supplies and applies it as part of full tunnel-lining and slope-stabilisation shotcrete packages rather than as a stand-alone, bag-and-go additive.
The technical insight
The detail worth flagging to any site engineer: MasterRoc TCC 735 is explicitly documented as incompatible with superplasticizers or other admixtures based on sulphonated naphthalene formaldehyde (SNF) — combining the two can cause an instant loss of workability, which on a live shotcrete nozzle is not a recoverable mistake. That single compatibility note tells you TCC 735 isn’t a lignosulphonate-type water reducer either; it behaves more like a hydration-controlling additive tuned specifically for the sprayed-concrete process. Practically, this means any admixture already in a project’s mix design — accelerator, retarder or plasticizer — needs a documented trial-mix compatibility check before TCC 735 is added at scale, not just a data-sheet read-through.
Where it is used
- Wet-mix sprayed concrete (shotcrete) for tunnel linings and underground support
- Rock-slope and portal stabilisation shotcrete on hill-highway and hydropower projects
- Mining drift, drive and stope support shotcrete
- Cast-in-place concrete using lean or low-cement mix designs
- Concrete made with poorly graded or fines-deficient local aggregates
- Hot-weather concreting where fast slump loss threatens spray quality
- Concrete needing reduced permeability without chloride-based accelerators
- Multi-layer shotcrete linings where interlayer/substrate bond is critical
Key advantages
- Chloride-free formulation — safe around reinforcement and rock bolts, with no corrosion risk
- Improves cement hydration, giving denser, higher-strength hardened concrete
- Enhances workability and pumpability of the fresh mix, easing wet-spray application
- Reduces early-age plastic shrinkage in sprayed and cast concrete
- Improves bond between shotcrete layers and to the rock/support substrate
- Can reduce the need for external membrane curing in some applications
- Works across OPC, PPC, PSC, microsilica and pozzolanic cement systems
- Backed by MasterRoc’s global underground-construction expertise plus Space Arc’s local application support
Limitations & considerations
- Incompatible with SNF (sulphonated naphthalene)-based superplasticizers — combining them can cause sudden workability loss
- Dosage is project- and mix-specific, confirmed only through trial batching, not a fixed percentage
- Built for tunnelling/mining-grade sprayed concrete, not a general-purpose ready-mix plasticizer
- Needs calibrated batching-plant dosing equipment and a trained crew, not hand-dosing on site
- Performance is sensitive to storage temperature and settling — drums must be stirred before use
- A specialised underground-construction product, so it is stocked to project demand rather than as a shelf SKU
Selection & best practice
Run a trial batch with the project’s actual cement source, aggregate grading and any existing admixtures before scaling up — TCC 735’s dosage is mix-specific, not a fixed rate off the drum label. Confirm no sulphonated-naphthalene (SNF) plasticizer is anywhere in the mix design before adding it. Store drums off the ground, away from frost and direct heat, and stir or roll them before dosing since the liquid can settle. Dose it into the gauging water or mixer through the batching plant’s calibrated dispenser — never by hand-bucket on a live shotcrete rig — and keep the TDS and SDS on site for the crew.
Specifications
| Form / appearance | Liquid, milky white |
| Density @ 20°C | 0.9 ± 0.1 kg/L (SG) |
| pH value | 8 – 10 |
| Viscosity @ 20°C | 150 ± 25 mPa·s |
| Chloride content | < 0.1% (chloride-free) |
| Packaging | 125 kg drum; 1000 kg IBC |
| Cement compatibility | OPC, PPC, PSC, microsilica and pozzolanic additions |
| Admixture compatibility | Not compatible with SNF (sulphonated naphthalene)-based superplasticizers |
| Application method | Wet-mix sprayed (shotcrete) and cast concrete |
Industry use cases
Tunnelling & metro rail
Primary lining shotcrete on NATM tunnel drives, where pumpability and bond to the rock face matter as much as final strength.
Hydropower & underground power projects
Headrace tunnel and powerhouse cavern shotcrete support in demanding, often hot underground conditions.
Hill highways & slope protection
Rock-face and cut-slope stabilisation shotcrete on ghat and Himalayan road projects.
Mining
Drift, drive and stope support shotcrete requiring consistent hydration and low rebound.
Urban infrastructure
Shotcrete in congested basement and retaining-wall excavations where lean mixes are common.
Frequently asked questions
What does MasterRoc TCC 735 actually do to the concrete?
Is TCC 735 an accelerator?
Can we dose it with our existing plasticizer?
What dosage should we use?
How is it packed and stored, and does it have a shelf life?
Where does this fit versus a normal ready-mix plasticizer?
How we position Master Builders Solutions MasterRoc TCC 735
MasterRoc TCC 735 sits inside Master Builders Solutions’ underground-construction (MasterRoc) family. Space Arc typically pairs it on tunnel and mining projects with MasterRoc alkali-free accelerators for shotcrete set control, steel or synthetic fibres for post-crack toughness, and MasterSeal waterproofing systems once the permanent lining is in place. It’s a specialist product rather than a general-purpose plasticizer, so it isn’t a head-to-head match for Fosroc’s mainstream Conplast admixture range, which targets conventional RMC and precast work rather than sprayed-concrete tunnelling. For shotcrete-grade hydration control on Indian underground and hydropower sites, MasterRoc remains the system most specifiers default to, and Space Arc supplies and applies the full chain rather than a single admixture in isolation.
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