Solidification Effect and Mechanism of Marine Muck Treated with Ionic Soil Stabilizer and Cement

Xue-Ting Wu,Jun-Ning Liu,Bin Chen,Yi Qi

doi:10.3390/min11111268

Xue-Ting Wu, Jun-Ning Liu + Show 2 more

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https://doi.org/10.3390/min11111268

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Abstract

In this study, an environmentally friendly ionic soil stabilizer (ISS) was adopted with combination of Portland cement to stabilize a marine muck. The macro and micro tests results demonstrated that the ISS was an effective stabilizer to improve the strength of marine muck when it was used combined with cement after adding the alkalizer NaOH. Except for the reduction in interlayer distance of clay minerals by ISS, Ca2+ and SO42− dissolved from ISS promoted the production of ettringite (AFt), pozzolanic and carbonation reactions of Portland cement in the presence of NaOH. Meanwhile, the hydration products of curing reaction notably agglomerated soil particles, which caused an obvious decrease of pores and a high increase of strength for solidified soils. Furthermore, this combination of stabilizers can not only save the dosage of cement, but also accelerate the solidification speed, decrease the cement setting time within 7 days to meet the curing requirements, and enhance the strength of solidified soils.

Highlights

Introduction with Ionic Soil Stabilizer andCement.Marine soft soil deposits are widely distributed in the southeast of China, where the economy is highly developed and requires a large number of roads, railways, buildings, etc
These results indicated that the new substances of cement hydration were difficult to form in the acidic environment of ionic soil stabilizer (ISS)
Water content, pH, unconfined compression test (UCT), direct shear test (DST), scanning electron microscope (SEM), PCAS, X-ray diffraction (XRD), and X-ray fluorescence (XRF) tests were carried out to study the solidification effect and mechanism of marine muck treated with the combination of ISS and Portland cement, under the different conditions of ISS:water ratio, Portland cement dosage, and whether the alkalizer NaOH has been added before cement

Summary

Introduction

Marine soft soil deposits are widely distributed in the southeast of China, where the economy is highly developed and requires a large number of roads, railways, buildings, etc. Adding suitable binders into soft soil is considered to be a very useful way to solve the above significant engineering problems and has been widely used [4,5,6,7]. Portland cement is one of the most widely used cementitious material, which can provide efficient soil solidification effect with high durability [8,9,10]. Finding sustainable green cementitious materials to partially or completely replace Portland cement has become an appealing goal in the field of industry and environmental research

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