Combined effect of lignosulfonate and carbonate on pure portland clinker compounds hydration. III. Hydration of tricalcium silicate alone and in the presence of tricalcium aluminate

Monosi, Saveria; Moriconi, Giacomo; Collepardi, M.

doi:10.1016/0008-8846(82)90057-6

Cited by 19 publications

(10 citation statements)

References 6 publications

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“…In conclusion, lignosulfonate was found to retard or accelerate C 3 S hydration (Ramachandran, 1994, Lorprayoon and depending on its concentration in the pore solution . C 3 A hydration was found to be retarded by lignosulfonate by some authors (Ramachandran, 1994, while not retarded (Monosi et al, 1983) or slightly accelerated (Monosi et al, 1982, Collepardi et al, 1973 by other authors.…”

Section: Effect Of Plasticizers On Setting Timementioning

confidence: 93%

“…On the contrary, C 3 S hydration was found to speed up for lignosulfonate concentrations under 1 g/l of water. Monosi et al (Monosi et al, 1982) found that, in a C 3 A-C 3 S system, the addition of calcium lignosulfonate led to a strong retardation in C 3 S hydration, while C 3 A hydration was slightly accelerated. The C 3 S retardation in the C 3 A-C 3 S system was lower than that in pure C 3 S systems.…”

Section: Effect Of Plasticizers On Setting Timementioning

confidence: 94%

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On the mechanisms of consumption of calcium lignosulfonate by cement paste

Colombo

Justnes

Lauten

et al. 2017

Cement and Concrete Research

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The thesis consists of an introduction and three appended papers. Trondheim, 25.01.2017 Alessia Colombo III I would like to acknowledge my Supervisors, Klaartje De Weerdt, Mette Geiker and Harald Justnes, and the Project Manager from Borregaard, Rolf Andreas Lauten, for giving me the opportunity of taking this PhD. Thank you for guiding me through my PhD project and helping me with your expertise, for always aiming to keep the level of our research high, and for supporting me with your enthusiasm and passion for the work. You have taught me a lot under both professional and human level. I would like to acknowledge Gwenn Le Saoût and Nathalie Azema (Ecole des Mines d'Alès, France) for giving me the opportunity of visiting their laboratories and working with them for one week, for the interesting discussions and for their availability in performing, amongst other analyses, the characterization of the materials used in my PhD.

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Section: Effect Of Plasticizers On Setting Timementioning

confidence: 93%

Section: Effect Of Plasticizers On Setting Timementioning

confidence: 94%

On the mechanisms of consumption of calcium lignosulfonate by cement paste

Colombo

Justnes

Lauten

et al. 2017

Cement and Concrete Research

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“…The sugars can be almost completely removed, however also sugar-reduced LS can cause retardation [14]. Several studies concluded that the addition of calcium lignosulfonate changes the hydration of C 3 S and C 3 A [13,[15][16][17][18][19]. According to Ramachandran [18], a strongly surface-bound calcium lignosulfonate complex could be detected for both C 3 A and C 3 S, which could cause retardation of C 3 A and C 3 S hydration.…”

Section: Introductionmentioning

confidence: 99%

On the effect of calcium lignosulfonate on the rheology and setting time of cement paste

Colombo

Geiker

Justnes

et al. 2017

Cement and Concrete Research

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The effect of softwood calcium lignosulfonate, LSs, on the rheology and setting time of cement paste has been investigated. Two Portland cements with different surface area and C 3 A content were used. The lignosulfonate was added either immediately with the mixing water or delayed after 10 minutes of hydration. The cement pastes were characterized in terms of specific surface, rheology and heat of hydration. Extracted pore solutions were analysed for free lignosulfonate concentration and for changes in elemental composition. Immediate addition of LSs increased the specific surface, but not delayed addition. Correlations were found between rheology and surface coverage by LSs, as determined by adsorption isotherms, and between the setting time and the amount of free LSs in the pore solution. An increased setting retardation upon delayed addition related to an increased concentration of Al in the pore solution.

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“…Sodium aluminate was reported to be able to modify the pore structure of cement paste at an early age, improve the resistance to chloride ingress, and increase early-age compressive strength [12]. Carbonates [7,13,14,15,16,17] and bicarbonates with alkali were also among the most-used accelerators, such as Na 2 CO 3 and NaHCO 3 [18,19,20,21,22]. Mathur and Sharma [23] reported that the NaHCO 3 can improve the strength and porosity of cement paste.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Effects of Sodium Bicarbonate and Sodium Carbonate on the Hydration and Properties of Portland Cement Paste

Wang

Wang³

et al. 2019

Materials

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Carbonates and bicarbonates are two groups of accelerators which can be used in sprayed concrete. In this study, the effects of the two accelerators sodium carbonate (Na2CO3) and sodium bicarbonate (NaHCO3) (0%, 1%, 2%, 3%, and 4% by weight of ordinary Portland cement OPC) on the properties of OPC paste were compared. The results show that both of them could accelerate the initial and final setting time of OPC paste, but the effect of the two accelerators on the compressive strength were different. After 1 day, sodium bicarbonate at 3% had the highest strength while sodium carbonate at 1% had the highest strength. After 7 days, both of the two accelerators at 1% had the highest compressive strength. After 28 days, the compressive strength decreased with the increase of the two. The improved strength at 1 and 7 days was caused by the accelerated formation of ettringite and the formation of CaCO3 through the reactions between the two with portlandite. The decrease of strength was caused by the Na+ could reduce the adhesion between C-S-H gel by replacing the Ca2+. NaHCO3 was found be a better accelerator than Na2CO3.

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Combined effect of lignosulfonate and carbonate on pure portland clinker compounds hydration. III. Hydration of tricalcium silicate alone and in the presence of tricalcium aluminate

Cited by 19 publications

References 6 publications

On the mechanisms of consumption of calcium lignosulfonate by cement paste

On the mechanisms of consumption of calcium lignosulfonate by cement paste

On the effect of calcium lignosulfonate on the rheology and setting time of cement paste

Comparison of Effects of Sodium Bicarbonate and Sodium Carbonate on the Hydration and Properties of Portland Cement Paste

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