Natural organic matter and the formation of calcium-silicate-hydrates in lime-stabilized smectites: A thermal analysis study

Harvey, Omar R.; Harris, J Patrick; Herbert, Bruce; Stiffler, Eric A.; Haney, Stephen P.

doi:10.1016/j.tca.2010.04.007

Cited by 25 publications

(7 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the presence of organic matter in PG, such as humic and fulvic acids will further increase cation exchange capacity of bentonite [45]. This results in increasing Ca 2+ amount to satisfy the cation exchange capacity of the mixture and thereby reduces the amount of Ca 2+ available for CSH formation [46].…”

Section: 665mentioning

confidence: 99%

Phosphogypsum waste as additives to lime stabilization of bentonite

Oumnih

Bekkouch

Gharibi

et al. 2019

Sustain Environ Res

View full text Add to dashboard Cite

Waste recycling with increasing the lifecycle of resource is a novel approach for enhancing circular economy. Within this context, this study aims to give a second life cycle to phosphogypsum (PG) waste, which is a byproduct from phosphoric acid manufacture, as useful resources. This study evaluates the sustainability of this harmful waste, which is accumulated in large stockpiles and becomes hazardous during storage, and to stabilize bentonite-based concrete intended for road construction. The effect of raw bentonite (Ca-Na montmorillonite), PG, and lime on the properties of cementitious materials has been investigated through various tests. The properties examined include chemistry (X-ray Fluorescence Spectrometry), mineralogy (X-ray Powder Diffraction and Fourier-Transform Infrared Spectroscopy), calorimetry (Differential Thermal Analysis/Thermogravimetry) and microstructure (Scanning Electron Microscopy) of the mortar based on different mixtures of bentonite, PG and lime. The result show that lime and PG addition involves in the formation of new nanocrystalline phases and the disappearance of certain minerals as portlandite. Calcium silicate hydrate gel appeared in the mixture with 8% of lime, whereas strätlingite was neoformed in the mixture with 8% of lime and 8% of PG. These nanocrystalline phases are responsible for enhancing mechanical strength through the pozzoloanic reaction.

show abstract

Section: 665mentioning

confidence: 99%

Phosphogypsum waste as additives to lime stabilization of bentonite

Oumnih

Bekkouch

Gharibi

et al. 2019

Sustain Environ Res

View full text Add to dashboard Cite

show abstract

“…FTIR (Fourier Transform Infrared Spectroscopy) analyses have shown that silicate polymerization is greatly hampered during the stabilization of soils containing organic matter (25). As a result, the strength development of the stabilized soil is mainly affected by the existence of organic matter, notably humic acid ((22), (25), (26)). In addition, fulvic acid break down existing crystals, such as hydrates, thus preventing the formation of a cement soil structure ((20), (27)).…”

Section: Introductionmentioning

confidence: 99%

Effect of potassium humate as humic substances from river sediments on the rheology, the hydration and the strength development of a cement paste

Beddaa

Fraj

Lavergne

et al. 2019

Cement and Concrete Composites

View full text Add to dashboard Cite

Dredged river sediments may contain various types of organic matter that can affect the properties of a cement matrix, with the most representative part of such organic matter consisting of humic substances (HS). This work seeks to investigate the effects of humic substances on the rheology, the hydration and the strength development of a cement paste with different curing times, ranging from 1 to 90 days. Results show that adding organic matter to the cement paste offers greater workability by decreasing the yield stress. This addition also serves to retard the hydration of cement particles. Setting times increase to beyond one week when raising the amount of humic substances in the mixture, while the heat released ultimately reaches values comparable to those of the reference cement paste. Therefore, the addition of organic matter negatively affects strength development of the paste, especially at an early age; no resistance at 1-day has been noticed for HS content greater than 1%. Nevertheless, that there was no significant reduction in the compressive strength up to 20% for HS content less than 1% at 90-day. In parallel, a study on pastes containing calcium lignosulfonate (water reducer) is carried out and the same effects are observed.

show abstract

“…Furthermore, valorization of dredged sediments within cemented mortars may be limited by the high content of organic matter and/or clays as well as soluble sulfates production, which is often associated to major metal contamination (Chinchón et al, 1995;Harvey et al, 2010;Rajasekaran, 2005). These compounds being usually contained within the finest fraction, a particle size separation pretreatment may be applied before reuse to improve mortars mechanical behavior as well as to separate the recoverable fraction from the most contaminated one.…”

Section: Introductionmentioning

confidence: 99%

Feasibility of the reuse of total and processed contaminated marine sediments as fine aggregates in cemented mortars

Couvidat

Benzaazoua

Chatain

et al. 2016

Construction and Building Materials

View full text Add to dashboard Cite

In a context promoting waste sustainable management, dredged sediments are assessed for valorization as substitute for sand in non-structural cemented mortars. Full substitution of sand by total sediment revealed low mechanical performances at UCS testing, linked to a high porosity. However, mechanical strength was improved, and porosity reduced, by using 80µmsized sediment. Thus, porosity is correlated to the presence of a fine fraction and its constitution, which brought a higher water demand during formulation. This research confirmed that the reuse of the coarser fraction of a marine sediment offered an interesting valorization potential as cemented mortars for non-structural applications.

show abstract

Natural organic matter and the formation of calcium-silicate-hydrates in lime-stabilized smectites: A thermal analysis study

Cited by 25 publications

References 12 publications

Phosphogypsum waste as additives to lime stabilization of bentonite

Phosphogypsum waste as additives to lime stabilization of bentonite

Effect of potassium humate as humic substances from river sediments on the rheology, the hydration and the strength development of a cement paste

Feasibility of the reuse of total and processed contaminated marine sediments as fine aggregates in cemented mortars

Contact Info

Product

Resources

About