Solidification of Marine Soft Soil under Alkali Excitation

Abstract

Abstract: In order to improve the effect of industrial waste calcium carbide slag and undisturbed ash on the solidification of soft soil, polycarboxylate superplasticizer, sodium silicate, sodium sulfate, and triethanolamine were selected as additives. The unconfined compressive strength test (UCS), X-ray diffraction (XRD), and scanning electron microscope (SEM) were used to study the synergistic effect of the additives. The results show that 0.1% (mass fraction) polycarboxylate superplasticizer combined with 3% (mass fraction) sodium silicate or 0.9% (mass fraction) sodium sulfate can significantly improve the strength of solidified soil, and the composite early strength agent with 1:1 ratio of sodium silicate and sodium sulfate was determined. The optimum ratio of superplasticizer, composite early strength agent and industrial waste residue were determined by orthogonal test. At the age of 7 d and 28 d, the strength increase of the solidified soft soil with composite early strength agent is 47% and 77% higher than that without composite early strength agent. At the age of 7 d, the dispersion effect of superplasticizer plays a leading role in the solidified soil, while at the age of 28 d, the pozzolanic effect of composite early strength agent under alkali excitation is more obvious.

Key words: marine soft soil, unconfined compressive strength, soil stabilizer, solidification mechanism

CLC Number:

TU447

WANG Weiqi, SUN Hong, GE Xiurun. Solidification of Marine Soft Soil under Alkali Excitation[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(7): 2248-2255.

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