Design and function of novel superplasticizers for more durable high performance concrete (superplast project)

Houst, Y. F.; Bowen, Paul; Perche, F.; Kauppi, Annika; Borget, Pascal; Galmiche, Laurent; Meins, Jean-François Le; Lafuma, F.; Flatt, Robert J.; Schober, I.; Banfill, Phillip Frank Gower; Swift, David S.; Myrvold, Bernt O.; Petersen, B. G.; Reknes, K.

doi:10.1016/j.cemconres.2008.04.007

Cited by 213 publications

(113 citation statements)

References 36 publications

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“…Figure 6a depicts simulation of the adsorption of carboxylate groups of the CMCH onto the cement surface. This finding is supported by previous work reporting adsorption onto cement particle surfaces for carboxylate substituted polymers [24,25]. The adsorbed polymer molecules could then link different cement particles (Fig.…”

Section: Cement Solutionssupporting

confidence: 88%

Interaction of carboxymethylchitosan and heavy metals in cement media

Lasheras-Zubiate

Navarro-Blasco

Álvarez

et al. 2011

Journal of Hazardous Materials

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The performance of an etherified chitosan, carboxymethyl chitosan (CMCH), when added to cement mortars doped with heavy metals, was assessed. In the presence of heavy metals (Cr, Pb, Zn) strong modifications of the fresh-state properties were evaluated. The addition of the polymer was seen to be useful in minimising some of these modifications, as those related to the setting time. A competitive mechanism for adsorption between the oxoanionic form of the metals and the carboxylate groups of the chitosan derivative was established. Studies on the metal chelating ability of the polymer and leaching from the hardened specimens showed scarce complexation under alkaline conditions, pointing to physical entrapment based on metal adsorption. However, significant chelation of metals was proved at near-neutral pH, suggesting the potential usefulness of the polymer as a agent for removing heavy metals from polluted waters and subsequently immobilizing them in cement mortars. Leaching tests carried out on polymer-metal complex-bearing samples showed a significant reduction in the amount of released Pb and Zn.

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Section: Cement Solutionssupporting

confidence: 88%

Interaction of carboxymethylchitosan and heavy metals in cement media

Lasheras-Zubiate

Navarro-Blasco

Álvarez

et al. 2011

Journal of Hazardous Materials

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“…As a slag component of alkaline cements, a ground granulated blast furnace slag (GBFS) with a glass phase content of 54.5 %, real density of γ=2.88 g/cm 3 , activity modulus M a =1.18 and basicity modulus M b =0.15 was used. As a component of alkaline cements, PCC was also used with the following chemical composition: 21.3 % SiO 2 ; 5.9 % Al 2 O 3 ; 4.6 % Fe 2 O 3 ; 1.2 % MgO; 64.9 % CaO; 0.3 % Na 2 O; 0.31 % K 2 O; 0.86 % SO 3 .…”

Section: Materials and Methods Used In Studying Sasmentioning

confidence: 99%

“…Admixtures of these types are effective for cements based on Portland cement clinker (PCC) for which they were developed [3,4].…”

Section: Introductionmentioning

confidence: 99%

Analysis of plasticizer effectiveness during alkaline cement structure formation

Kryvenko

Runova

Rudenko

et al. 2017

EEJET

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Проаналізовано проблему пластифікації цементів, лужне середовище яких визначає при-сутність сполук лужних металів, та запропоно-вано шляхи її вирішення. В якості альтернативи суперпластифікаторам на основі складних поліе-фірів запропоновано широке коло поверхнево-ак-тивних речовин, придатних для пластифікації лужних цементів. Органічні сполуки системати-зовані за ефективністю дії як пластифікатори лужних цементів Ключові слова: лужний цемент, хімічна добав-ка, поверхнево-активна речовина, гранульований доменний шлак, цементне тісто, пластична міц-ність Проанализирована проблема пластификации цементов, щелочную среду которых определя-ет присутствие соединений щелочных метал-лов, и предложены пути ее решения. В каче-стве альтернативы суперпластификаторам на основе сложных полиэфиров предложен широ-кий круг поверхностно-активных веществ, при-годных для пластификации щелочных цементов. Органические соединения систематизированы по эффективности действия в качестве пластифи-каторов щелочных цементов Ключевые слова: щелочной цемент, химиче-ская добавка, поверхностно-активное вещество, гранулированный доменный шлак, цементное тесто, пластическая прочность UDC 691.5

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“…Consequently, the more effective fluidization generated by PC2, PC3 and PC4 can be associated with the greater induced steric repulsion. This can be related to their higher molecular weight (see Table 4), which should induce an increase in the adsorbed layer thickness [26][27][28]. However, it is observed that in cement pastes with the highest slag content (C4 and C5), low dosages of PC6 (0.25-0.50 mg/g binder), despite its lower molecular weight, induces a similar decrease of yield stress to PC2, PC3 and PC4.…”

Section: Rheological Behaviourmentioning

confidence: 99%

Effect of PCs superplasticizers on the rheological properties and hydration process of slag-blended cement pastes

et al. 2009

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The effect of polycarboxylate (PC) superplasticizers with different structure on the rheological properties and hydration process of slag-blended cement pastes with a slag content between 0 and 75% has been studied. Fluidizing properties of PCs admixtures are significantly higher in slag-blended cement with respect to non-blended Portland cement. Also, it has been observed that the rise of the fluidity induced by the PCs on the cement pastes increases with the slag content. This effect is mainly attributed to a decrease in the amount of C 3 A available to adsorb and consume admixture to form an organo-mineral phase. Consequently, the PC admixtures are absorbed onto the silicate phases of the clinker and onto the slag particles, inducing a repulsion and the concomitant reduction in yield stress despite a reduction in the zeta potential. The rheological results allow us to conclude that the highest increase of the fluidity is caused by the admixtures with highest molecular weight due to the higher steric repulsion induced. As a consequence of the adsorption of the PCs, a delay of the hydration process of the pastes has been observed.

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Design and function of novel superplasticizers for more durable high performance concrete (superplast project)

Cited by 213 publications

References 36 publications

Interaction of carboxymethylchitosan and heavy metals in cement media

Interaction of carboxymethylchitosan and heavy metals in cement media

Analysis of plasticizer effectiveness during alkaline cement structure formation

Effect of PCs superplasticizers on the rheological properties and hydration process of slag-blended cement pastes

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