The effects of seeding C^sub 3^S pastes with afwillite
The addition of 1–4% s/s (dry solids by mass of C3S) of afwillite (C3S2H3) seeds to C3S pastes made with two different commercial polyacrylate-based superplasticizers (SP) allows the pastes to be cast at low water/C3S mass ratios (w/c) and overcomes the hydration retardation produced by the SPs. SP-...
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| Veröffentlicht in: | Cement and concrete research 2016-11, Vol.89, p.145 |
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| container_title | Cement and concrete research |
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| creator | Horgnies, Matthieu Fei, Lingjie Arroyo, Raquel Chen, Jeffrey J Gartner, Ellis M |
| description | The addition of 1–4% s/s (dry solids by mass of C3S) of afwillite (C3S2H3) seeds to C3S pastes made with two different commercial polyacrylate-based superplasticizers (SP) allows the pastes to be cast at low water/C3S mass ratios (w/c) and overcomes the hydration retardation produced by the SPs. SP-free C3S pastes seeded with afwillite at an initial w/c of 0.50 gave about 30% lower 28-day compressive strengths than the unseeded controls, due to higher porosities. However, at w/c = 0.35, with the addition of 0.4% s/s SP, the afwillite-seeded pastes gave similar or higher strengths than the unseeded controls at all ages tested. Hydration rate data obtained by chemical shrinkage measurements suggest that this is because the degrees of hydration of the C3S in the low w/c afwillite-seeded pastes made with added SP reach higher values than in the unseeded controls, compensating for the difference in density of the hydrates. |
| format | Article |
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SP-free C3S pastes seeded with afwillite at an initial w/c of 0.50 gave about 30% lower 28-day compressive strengths than the unseeded controls, due to higher porosities. However, at w/c = 0.35, with the addition of 0.4% s/s SP, the afwillite-seeded pastes gave similar or higher strengths than the unseeded controls at all ages tested. Hydration rate data obtained by chemical shrinkage measurements suggest that this is because the degrees of hydration of the C3S in the low w/c afwillite-seeded pastes made with added SP reach higher values than in the unseeded controls, compensating for the difference in density of the hydrates.</description><identifier>ISSN: 0008-8846</identifier><identifier>EISSN: 1873-3948</identifier><language>eng</language><publisher>Elmsford: Elsevier BV</publisher><subject>Age ; Cement hydration ; Compressive properties ; Diffraction ; Hydrates ; Hydration ; Mass ratios ; Microstructure ; Pastes ; Seeds ; Shrinkage ; Studies ; Superplasticizers ; Thermogravimetric analysis ; Tricalcium silicate</subject><ispartof>Cement and concrete research, 2016-11, Vol.89, p.145</ispartof><rights>Copyright Elsevier BV Nov 2016</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>315,781,785</link.rule.ids></links><search><creatorcontrib>Horgnies, Matthieu</creatorcontrib><creatorcontrib>Fei, Lingjie</creatorcontrib><creatorcontrib>Arroyo, Raquel</creatorcontrib><creatorcontrib>Chen, Jeffrey J</creatorcontrib><creatorcontrib>Gartner, Ellis M</creatorcontrib><title>The effects of seeding C^sub 3^S pastes with afwillite</title><title>Cement and concrete research</title><description>The addition of 1–4% s/s (dry solids by mass of C3S) of afwillite (C3S2H3) seeds to C3S pastes made with two different commercial polyacrylate-based superplasticizers (SP) allows the pastes to be cast at low water/C3S mass ratios (w/c) and overcomes the hydration retardation produced by the SPs. SP-free C3S pastes seeded with afwillite at an initial w/c of 0.50 gave about 30% lower 28-day compressive strengths than the unseeded controls, due to higher porosities. However, at w/c = 0.35, with the addition of 0.4% s/s SP, the afwillite-seeded pastes gave similar or higher strengths than the unseeded controls at all ages tested. 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SP-free C3S pastes seeded with afwillite at an initial w/c of 0.50 gave about 30% lower 28-day compressive strengths than the unseeded controls, due to higher porosities. However, at w/c = 0.35, with the addition of 0.4% s/s SP, the afwillite-seeded pastes gave similar or higher strengths than the unseeded controls at all ages tested. Hydration rate data obtained by chemical shrinkage measurements suggest that this is because the degrees of hydration of the C3S in the low w/c afwillite-seeded pastes made with added SP reach higher values than in the unseeded controls, compensating for the difference in density of the hydrates.</abstract><cop>Elmsford</cop><pub>Elsevier BV</pub></addata></record> |
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| ispartof | Cement and concrete research, 2016-11, Vol.89, p.145 |
| issn | 0008-8846 1873-3948 |
| language | eng |
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| source | Elsevier ScienceDirect Journals Complete |
| subjects | Age Cement hydration Compressive properties Diffraction Hydrates Hydration Mass ratios Microstructure Pastes Seeds Shrinkage Studies Superplasticizers Thermogravimetric analysis Tricalcium silicate |
| title | The effects of seeding C^sub 3^S pastes with afwillite |
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