DOI: 10.11648/j.sr.20261405.25 ISSN: 2329-0927

Experimental Study on Paste of Steel Slag-Slag Based Alkali-Activated Soft Soil Stabilizer

Jianbao Fu
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To develop an alkali-activated steel slag-slag based soft soil stabilizer meeting the requirements of the Chinese standard Soft Soil Stabilizer (CJT 526-2018), 22 mixture proportions were designed. The effects of water glass modulus (1.25–2.1), liquid-to-binder ratio (0.35–0.5), cellulose ether content (0–0.3 parts by mass), and steel slag/slag ratio (80:120–120:80) on the initial fluidity, 30 min fluidity, 60 min fluidity and initial setting time of the pastes were systematically investigated. The results show that only the mixtures with a liquid-to-binder ratio ≥0.5, water glass modulus ≥1.9 and cellulose ether content ≥0.1% fully meet the standard requirements. Among them, J21 (0.2% cellulose ether) exhibits the best performance: initial fluidity of 200 mm, 30 min fluidity of 174 mm, 60 min fluidity of 131 mm, and initial setting time of 298 min. At a liquid-to-binder ratio of 0.45, even with 0.2% cellulose ether, the 60 min fluidity remains below 65 mm; at a liquid-to-binder ratio of 0.5 without cellulose ether, the 60 min fluidity is only 70 mm; when the modulus is below 1.8, the initial setting time is always less than 45 min. Mechanism analysis indicates that a high modulus (≥1.9) prolongs the polycondensation induction period by providing polymerized silicate anions, thus ensuring a sufficient initial setting time; a high liquid-to-binder ratio (0.5) provides ample free water for lubrication and reaction buffering; cellulose ether synergistically maintains the integrity of the water film at 60 min through water retention and steric hindrance. This study provides a theoretical basis and an optimal mixture proportion for the engineering application of alkali-activated soft soil stabilizers.

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