About STP ShaliGrout HS

STP ShaliGrout HS is a ready-to-mix cementitious grout engineered for situations where both high fluidity and high strength matter at the same time. It arrives as a single-component dry powder, a controlled blend of Portland cement, graded fillers and chemical additives, so the site team only has to add measured clean water. Once mixed it flows freely into the narrow gap beneath a base plate, self-levels around bolts and reinforcement, and hardens into a dense, non-shrink bed that carries load straight through to the foundation. It is designed to be poured, not rammed, which is what makes it suited to precision equipment where the grout has to make continuous contact across the whole plate. Because it is a positive-expansion, non-shrink system, the hardened grout stays in firm contact with the plate rather than pulling away as ordinary sand-cement mortar tends to do.

For engineers and contractors in India, the appeal is that it behaves predictably on real sites. The powder is proportioned in the factory, so the strength you specify does not depend on a labourer’s sand-cement ratio. Mixing water is the single variable to control, and STP publishes a target of about 3.75 litres per 40 kg bag for a flowable pour. A 40 kg bag yields roughly 0.025 cubic metres, or about 25 litres of grout, which lets you estimate bag counts directly from pocket and base-plate volumes. The material reaches more than 60 N/mm2 at 28 days with useful early strength, so plant and machinery can be commissioned to schedule instead of waiting on a weak, shrink-prone bed. Space Arc Engineering supplies ShaliGrout HS as an authorised STP channel across Delhi NCR and pan-India, with technical guidance on dosage, yield and placement.

The technical insight

The mechanism that separates ShaliGrout HS from an ordinary cement-sand pack is shrinkage compensation. As any cementitious mix cures it tends to shrink, and a plain grout would shrink away from the underside of the plate, leaving voids and reducing effective bearing area. ShaliGrout HS carries a built-in expansion system that produces a small positive volume change in the plastic and early hardening stages, timed so the grout is still gaining strength as it locks against the plate. The result is that the bed stays in intimate contact and load is transferred over the full footprint rather than through a few high spots. The graded filler package and cement matrix are proportioned so the mix stays cohesive and flowable at the recommended water content, meaning it can travel across a base plate without the coarse particles settling out and the paste bleeding to the surface. Keeping to the stated water figure is critical: adding excess water to chase easier flow thins the paste, lowers strength and can reintroduce the bleeding and settlement the product is designed to avoid.

Where it is used

• Grouting under precision machinery and equipment base plates
• Filling anchor bolt pockets and holding-down bolt sleeves
• Column, stanchion and structural steel base grouting
• Grouting of bridge bearings, crane rails and rail track fixings
• Precast element connections and joint filling
• Deep pocket and cavity filling where pea gravel is added for larger voids
• Rigid, high-strength repair of load-bearing pockets and recesses
• Grouting in confined sections that demand a self-levelling, non-shrink fill

Key advantages

• Single-component powder needing only measured water, so on-site strength is not left to sand-cement guesswork
• Free-flowing consistency reaches into tight base-plate gaps and around bolts without ramming
• Non-shrink, positive-expansion behaviour keeps full bearing contact under the plate
• Develops more than 60 N/mm2 at 28 days with useful early strength for faster commissioning
• Predictable yield of about 25 litres per 40 kg bag simplifies quantity estimation
• Cohesive mix resists bleeding and segregation at the recommended water content
• Compatible with Portland cement concrete and steel base-plate substrates
• Suits a range of jobs from precision plant to structural pockets, reducing the number of products a site must stock

Limitations & considerations

• Cementitious, not epoxy; for chemical attack, oil-soaked bases or dynamic fatigue loading an epoxy grout is the better choice
• Single-lift pour thickness is bounded, roughly 25 mm minimum to 150 mm maximum in a large mass; deeper pockets need pea gravel or staged lifts
• Sensitive to mixing water, adding extra water to improve flow lowers strength and can cause bleeding
• Application temperature window matters; substrate and ambient conditions outside roughly 5 to 40 degrees C affect flow and set
• Requires disciplined surface preparation and continuous placement, so it is unforgiving of interrupted or careless pours
• Grouted surfaces must be cured and protected; exposed edges can dry out and crack if left uncured

Selection & best practice

Specifications

Industry use cases

How we position STP ShaliGrout HS

ShaliGrout HS sits in the middle of STP’s cementitious grout family as the high-strength, free-flow workhorse for base plates and anchors. Within the same STP range, ShaliGrout 50 and ShaliGrout 73 cover general free-flow non-shrink grouting duties, while the epoxy-based ShaliGrout EP 10 and ShaliGrout EI options step in where chemical resistance, oil-soaked bases or severe dynamic loading rule out a cementitious grout. For anchoring bars and bolts specifically, we can also advise on STP’s anchor grout and injection products. Across our other brands, Fosroc’s Conbextra line is the closest parallel and a common specifier default, and we stock complementary Fosroc, Sika and Dr. Fixit repair mortars and bonding agents that pair naturally with grouting work. Space Arc can help you match the right grout to the substrate, loading and exposure rather than defaulting to whatever is on the shelf.

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