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Download Developments in Strategic Materials and Computational Design by Greg Geiger PDF

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By Greg Geiger

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A different development in compressive strength could be observed for series of samples Cl, C2 and Dl, D2. For Cl and C2 a flat increase in strength is seen for ageing between 3 and 7 days followed by a more or less smooth weakening. Contrary to this a steep increase in strength up to 7 days of ageing is observed followed by a further significant increase in strength for series Dl and D2. 100 Ageing (days) Figure 5: Compressive strength development during ageing of test series A, B. B* denotes sound of cracking noted for series B samples, (see text).

The dissolution and condensation reactions occur in a metakaolin based geopolymer system can be shown as follows: i. Dissolution of Si0 2 and AI2O3 sources: A1203 + 3H 2 0 + 20H 1 Si0 2 + H 2 0 + OH 1 Si0 2 + 20H 1 32 -+ -v -► 2A1(0H)41 SiO(OH)3_1 Si02(OH)22- • Developments in Strategic Materials and Computational Design IV Role of Si0 2 and A! 2 0 3 on the Properties of Geopolymers with and without Calcium ii. Condensation of silicate and aluminate species: Na + + Si0 2 (OH) 2 2 " or SiCKOHy 1 * Al(OH) 4 ] -► NASH gel When the system is high in Si0 2 , more silicate species are available for condensation and reaction between silicate species, resulting oligomeric silicates, becomes dominant.

5, 1. As shown in Fig. 2 b Duxson et al. 9 prepared with NaOH and KOH containing activators. For activators including NaOH/KOH mixtures a different behavior were related to significant influences related to the alkaline ionic mobilities for geopolymerisation, too. The by a factor of two higher specific values obtained by Duxson et al. g. 40°C curing for 20 h. Duxson et al. 4 prepared the alkali activator so as to reveal a nominal Na/Al ratio = 1 in the cement, whereas our compositions M2-M7 were just varied by different mass ratios of the waterglass and metakaolin, which systematically increases the Si/Al and Na/Al ratios.

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