Ultra-High Performance Concrete & Grouting Solutions (UHPC / NSG C80–C100+)  |  Product Grade C80–C100+, Customizable

0.Applicable Standards & Codes

The design, testing and acceptance of this product (NSG / UHPC, precast & cast-in-situ systems) are based on the following current national and industry standards. The actual grade and performance indicators shall be subject to the type test report and factory inspection report of the corresponding product grade.

Note：GB/T 50448-2015 ；T/CBMF 37-2018  UHPC UC120/UC150/UC180（fcu：120≤fcu<150、150≤fcu<180、180≤fcu<210 MPa）

1 . Product Introduction

Non-shrink high-strength grout (NSG) is a dry-mixed powder composed of high-grade cement, graded aggregate, reactive mineral admixtures (silica fume, slag, etc.), high-range water reducer and composite expansion components. Mixed with water at the specified water/powder ratio on site, it offers early & high strength, high flowability, zero shrinkage, micro-expansion, oil resistance and durability.

UHPC (Ultra-High Performance Concrete) is a fiber-reinforced cementitious composite made of cement, silica fume, quartz powder/sand, HRWRA and high-strength fibers (steel or organic), without coarse aggregate and based on the dense-packing principle. It combines ultra-high mechanical performance (fcu ≥ 120 MPa), ultra-high impermeability and durability, and is normally used with NSG for prefab connection, wet joints and high-performance repair.

Products can be customized by strength grade (C80 / C100 / C100+), flow class, placement temperature (normal / low-temp / antifreeze) and function (early-strength, anti-corrosion, steel-fiber, heat-resistant), covering equipment-base regrouting, steel-column base, wind/nuclear foundation, precast sleeve grouting, bridge wet joints and structural strengthening.

2.Key Advantages

①  High & early strength: 1 d strength 30–50 MPa, 3 d 50–80 MPa, 28 d steadily C80–C100+, meeting rapid loading and heavy-load demands.

②  Self-leveling, high flow: Initial flow ≥290 mm, 30 min retention ≥260 mm (GB/T 50448); fills narrow gaps and rebar-dense zones without vibration, no segregation or bleeding.

③  Shrinkage-compensating: Composite expansion sources compensate plastic and drying shrinkage; vertical expansion 3 h 0.1–3.5%, 24 h minus 3 h 0.02–0.50%, ensuring full contact with substrate, no voids.

 ④  High toughness & fatigue resistance: UHPC with high-strength fibers: tensile strength ≥5 / 7 / 10 MPa (UT05/07/10), greatly increased fracture energy, impact & fatigue resistance and ductility.

⑤  Excellent durability & impermeability: Low w/b, high density; chloride diffusion ≤2.0×10⁻¹² m²/s, freeze-thaw up to F300+, impermeable, acid/alkali/salt-spray resistant, suitable for severe cold and marine environments.

⑥  Dimensional stability: 28 d autogenous shrinkage ≤0.045% (JG/T 408); UHPC shrinkage <200 με, small long-term deformation, compatible with existing structure.

⑦  Easy placement & consistent quality: Single-component dry mix, just add water on site; non-bleeding, non-segregating, pumpable or pourable, batch-consistent for standardized placement and quality control.

3.Main Technical Parameters

Table 1　Performance of high-strength non-shrink grout (NSG) (standard curing, water/powder ratio per manufacturer recommendation).

*The chloride ion content requirement for sleeve grouting material (JG/T 408) is stricter, which is ≤ 0.03%; C80/C100 universal grouting material shall be ≤ 0.10% (GB/T 50448). The Cl ⁻ content is based on the total amount of grouting material.

Table 2　UHPC performance (T/CBMF 37-2018 / GB/T 31387-2015, standard curing 28 d, 100 mm cube specimen).

Table 3　Sleeve grout (normal-temperature type, JG/T 408-2019) reference indicators.

4.Application & Usage Requirements

◦ 1. Substrate preparation: concrete substrate must be sound and clean — remove laitance, loose aggregate, oil and wax; thoroughly roughen and high-pressure wash. Soak 24 h before grouting, wipe standing water 1 h prior; keep damp but free of ponding.

◦ 2. Mixing: weigh water at recommended ratio (typically 12.5%–14.0% by mass, per TDS), use mechanical mixing (mortar or dedicated mixer), mix 240 s from water addition until uniform with no lumps; do not add extra or remix water.

◦ 3. Placement: pour continuously from one side, allowing self-leveling by gravity to avoid air pockets; do not discharge at one fixed point. Thickness normally ≤100 mm (pea-gravel type ≤150 mm+; large volume requires layers or added aggregate).

◦ 4. Gap & grade selection: gap ≥20 mm → general type; gap ≤20 mm → ultra-fine / high-flow type; rebar-dense or narrow joints → CGM-3 / sleeve grout. Placement height and speed shall follow the process requirement.

◦ 5. Curing: do not disturb before final set; cover and keep moist after initial set, standard cure (20±2 ℃, RH≥95%) ≥7 d. In cold weather (below 5 ℃), use low-temp/antifreeze grade with thermal curing to prevent freezing.

◦ 6. Trial mix & inspection: trial mix with actual materials before placement; prepare test cubes per batch, test strength at 1 / 3 / 28 d and check flow & expansion. Verify certificate and third-party test report upon delivery.

5.Precautions

◦ Strictly control water/powder ratio; do not adjust water arbitrarily, as deviation directly affects flow, strength and expansion.

◦ Use within working time (usually 30–45 min, depending on grade and temperature); do not re-add water or disturb after initial set.

◦ Min. ambient temperature during placement & 24 h curing: normal type ≥5 ℃ (some −5 ℃), low-temp type per JG/T 408 at −5–10 ℃. Outside range, apply thermal/cooling measures or switch to a dedicated grade.

◦ Grout must be continuous and full to meet Effective Bearing Area (EBA) requirements; do not pour from multiple sides simultaneously to avoid trapped air and voids.

◦ Alkaline product — wear gloves, goggles and dust mask; avoid skin/eye contact. If in eyes, flush with plenty of water and seek medical attention.

◦ For UHPC steel-fiber system, ensure uniform fiber dispersion and prevent balling; follow TDS for fiber feeding and mixing sequence.

◦ Actual mix proportion, performance and acceptance criteria shall follow the TDS, type/factory test reports and mix-design test report of the corresponding grade. Data herein are typical reference values.

6.Packaging & Storage

Packaging: multi-wall paper bags with PE liner, commonly 25 kg/bag or 50 kg/bag; bulk bags (1000 kg) or palletized packaging available on request. Powder and steel fiber (for UHPC) are normally packed separately.

Storage: store in a dry, ventilated, cool, rain- and moisture-proof warehouse, elevated from the floor and away from walls; stacking height per package label (normally ≤10 layers) to avoid damage and moisture caking.

Shelf life: normally 6 months from date of manufacture when unopened and stored as above; beyond shelf life, use only after passing inspection.

7.Scope of Application

◦ Secondary grouting of equipment bases, anchor bolt grouting, bases of large units / precision machine tools;

◦ Steel-column bases, bridge bearing pads, precast component sleeve (rebar connection) grouting;

◦ Wind-tower, nuclear, port and heavy-industry equipment foundations — large-volume, high-load grouting;

◦ Strengthening and retrofitting of concrete beams, columns, slabs and walls;

◦ UHPC: prefab main/girder beams, bridge deck paving & wet joints, high-performance façade/decorative elements, tunnel & municipal emergency repair, marine and severe-cold high-durability structures.