Water resistant blended cements containing flue-gas desulfurization gypsum, Portland cement and fly ash for structural applications

Wansom, S.; Chintasongkro, Poramet; Srijampan, Wananurat

doi:10.1016/j.cemconcomp.2019.04.033

Cited by 73 publications

(33 citation statements)

References 23 publications

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“…When this OPC clinker ( Table 2 ) chemically reacts with water, the cementitious compounds of C–S–H (calcium silicate hydrate) and others are produced, resulting in a strength gain characteristic of stabilized soil. In addition, in Table 2 , the presence of calcium sulfate dihydrate (gypsum) of approximately 5% by weight, can play a role in delaying the hydration reaction of calcium aluminates (C 3 A) in the OPC clinker [ 29 , 30 , 31 ] when reacting with water. This retarding effect caused by the gypsum in OPC could enhance the strength and durability of the cementitious products.…”

Section: Introductionmentioning

confidence: 99%

Stabilized High Clay Content Lateritic Soil Using Cement-FGD Gypsum Mixtures for Road Subbase Applications

et al. 2021

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With a lack of standard lateritic soil for use in road construction, suitable economical and sustainable soil-stabilization techniques are in demand. This study aimed to examine flue gas desulfurization (FGD) gypsum, a by-product of coal power plants, for use in soil–cement stabilization, specifically for ability to strengthen poor high-clay, lateritic soil but with a lower cement content. A series of compaction tests and unconfined compressive strength (UCS) tests were performed in conjunction with scanning electron microscope (SEM) analyses. Therefore, the strength development and the role of FGD gypsum in the soil–cement–FGD gypsum mixtures with varying cement and FGD gypsum contents were characterized in this study. The study results showed that adding FGD gypsum can enhance the strength of the stabilized substandard lateritic soil. Extra FGD gypsum added to the cement hydration system provided more sulfate ions, leading to the formation of ettringite and monosulfate, which are the hardening cementitious products from the cement hydration reaction. Both products contributed to the strength gain of the soil–cement–FGD gypsum material. However, the strength can be reduced when too much FGD gypsum is added because the undissolved gypsum has a weak structure. Examinations of FGD gypsum in the soil–cement–FGD gypsum mixtures by SEM confirmed that adding FGD gypsum can reduce the cement content in a soil–cement mix to achieve a given UCS value.

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Section: Introductionmentioning

confidence: 99%

Stabilized High Clay Content Lateritic Soil Using Cement-FGD Gypsum Mixtures for Road Subbase Applications

et al. 2021

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“…This observation was consistent with the ndings reported in the literature. 21,22 The mechanisms and pathways of CO 2 mineralization using PCFA were proposed as follows; the lime (CaO) and portlandite (Ca(OH) 2 ) in the fresh PCFA were rst dissolved and leached into the water as shown in eqn (1) and (2), respectively. Wei et al 23 suggested that, upon contact with water, the reactive minerals (e.g., lime and portlandite) of calcium-bearing components in y ash would readily dissolve within the rst few minutes.…”

Section: Resultsmentioning

confidence: 99%

Mechanistic insight into mineral carbonation and utilization in cement-based materials at solid–liquid interfaces

2019

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“…ese aggregates are cemented by gelling products such as CSH gel and increase the interparticle interaction. Aggregates, fine particles, and hydration products attached to the surface of desulfurized gypsum particles reduce the dissolution of CaSO 4 •2H 2 O and improve water stability of RMCC [46,47]. e CSH gel generated by hydration reaction has a cementation effect, while the AFt generated by pozzolanic reaction has a filling effect.…”

Section: Microstructure Analysismentioning

confidence: 99%

Effect of Freezing‐Thawing Cycle on the Mechanical Properties and Micromechanism of Red Mud‐Calcium‐Based Composite Cemented Soil

Hao

Suo

Hao

et al. 2020

Advances in Civil Engineering

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The environmental issues caused by solid waste have become increasingly serious. Adding additive is considered as an effective measure to improve the performance of the cemented soil. Therefore, the feasibility study of solid waste such as red mud and desulfurization gypsum used in composite cemented soil is in urgent demand. In this study, the mechanical properties and durability to freezing-thawing cycle of red mud-calcium-based composite cemented soil (RMCC) were analyzed through compressive strength test, resistivity test, and freezing-thawing cycle test. The action mechanism of RMCC was revealed through a series of X-ray diffraction (XRD) and scanning electron microscope (SEM) with energy dispersive spectrometer (EDS) test. The results show that the optimal red mud content in RMCC is 12%. As the freezing-thawing cycle progresses, the difference in resistivity and pressure sensitivity of RMCC gradually weakens. When the freezing-thawing cycle reaches 7, the pressure sensitivity characteristic of RMCC is lost. The change in resistivity and pressure sensitivity can be used to characterize the damage caused by the freezing-thawing cycle. Combined with XRD and SEM analysis, the presence of minerals such as K2Ca5(SO4)6·H2O and (Ca, Na)2(Si, Al)5O10·3H2O play a key role in fixation of alkali metal elements, and the coordination of CSH gel cementation effect and AFt filling effect has a significant impact on mechanical properties. The study provides an effective way to the utilization of red mud and desulfurization gypsum in subgrade strengthening.

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Water resistant blended cements containing flue-gas desulfurization gypsum, Portland cement and fly ash for structural applications

Cited by 73 publications

References 23 publications

Stabilized High Clay Content Lateritic Soil Using Cement-FGD Gypsum Mixtures for Road Subbase Applications

Stabilized High Clay Content Lateritic Soil Using Cement-FGD Gypsum Mixtures for Road Subbase Applications

Mechanistic insight into mineral carbonation and utilization in cement-based materials at solid–liquid interfaces

Effect of Freezing‐Thawing Cycle on the Mechanical Properties and Micromechanism of Red Mud‐Calcium‐Based Composite Cemented Soil

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