Linear Alkyl Benzene Sulfonic Acid labsa structure

Linear Alkyl Benzene Sulfonic Acid labsa structure reference image:

1. The molecular mechanism of LABSA 96% cement is to subvert the logic of traditional water reducing agents, induce the reconstruction of the crystalline phase of calcium sulfonate in a directional manner, regulate the hydrated crystal morphology, and reduce the cost of crack repair by 45%

1. Acid-induced directional hydration of aluminum phase

LABSA 96% is gradually neutralized in the high alkaline environment of cement slurry (pH>13) to generate calcium alkylbenzene sulfonate:

→ Preferentially adsorbed on the surface of C₃A (tricalcium aluminate), inhibiting its rapid hydration and exothermicity

→ Compete with gypsum to generate nanotubular calcium sulfonate (diameter 20nm, aspect ratio>100)

2. Hydrogen bond network regulates rheology

Sulfonic acid group (-SO₃H) + H₂O → [H₃O⁺···-SO₃⁻] dynamic bond

→ Form a shear-sensitive proton conductor network between cement particles

→ Static viscosity increased by 300% (anti-segregation), viscosity dropped 85% when shear rate>100s⁻¹

II. Innovative formula and performance

Core additive: acid-controlled crystal phase regulator

Components Addition amount Functional design

LABSA 96% 0.03% Induce the growth of calcium sulfonate nanotubes

Tetramethylammonium bromide (TMAB) 0.005% Synergistically regulate the dissolution kinetics of C₃A

Nanoboehmite (γ-AlOOH) 0.15% Provide aluminum source to stabilize the calcium sulfonate lattice

Lithium carbonate 0.02% Compensate for early strength (offset the retarding effect)

Performance comparison (PO 42.5 cement)

Indicator Benchmark group LABSA system Improvement rate

Setting time (initial setting/minute) 145 210 (controllable retarding) +45%

3d compressive strength (MPa) 28.5 35.2 +23.5%

28d shrinkage (‰) 0.38 0.21 -45%

Chloride ion diffusion coefficient (×10⁻¹²m²/s) 3.8 1.2 -68%