Alkali activated clay mortars with different activators

Karozou, Aspasia; Konopisi, Stavroula; Paulidou, E.; Stefanidou, Maria

doi:10.1016/j.conbuildmat.2019.03.244

Cited by 17 publications

(8 citation statements)

References 24 publications

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“…The physical properties of the clay mortars were recorded and presented here after the age of 180 days to allow the carbonation mechanism to harden the soft clay structure. This decision was made after the experience recorded in previous tests [ 29 ]. The capillary absorption was measured at the 180 days and 365 days, with the capillary coefficient indicating the water absorption trend of the specimens.…”

Section: Resultsmentioning

confidence: 99%

“…The XRD analysis indicated that the soil particles consisted of quartz, calcium aluminum hydroxide, calcite, cancrinite, and a small percentage of muscovite. Moreover, the high content of calcium oxide of 25% was reported by the results of the chemical analysis using atomic absorption technique [ 29 ]. The specific gravity of the dry material was 1.96 g/cm 3 (ASTM-C188-95) [ 30 ], and the color characterization by Munsell charts is 5Y 7/1 light grey.…”

Section: Methodsmentioning

confidence: 99%

“…The details of the mortars’ manufacture, as well as the activators used, can be found in a previous publication [ 29 ]. To clarify the acronyms PO stands for potassium metasilicate, which was used as such, SC for sodium carbonate solution, in a ratio of 70:30 water: sodium carbonate, WGS for sodium metasilicate, which was used as such, and WGN for sodium hydroxide solution mixed with water–glass at a 1:1 ratio.…”

Section: Methodsmentioning

confidence: 99%

“…However, they have not been thoroughly tested in such an impure clay system. The mortars’ composition can be seen in Table 1 , while the pH values, the details of the mortar mixtures, and curing conditions can be found in a previously published research paper [ 29 ]. The workability achieved was recorded by the flow table, as mentioned in EN 1015-3.…”

Section: Methodsmentioning

confidence: 99%

“…In the ages of 180 days and 365 days, the compressive and flexural strength of the mortars was examined (EN1015-11). The results recorded at the early age of 28 days and 90 days are presented in a previously published study [ 29 ]. Concerning the volume stability of the mortars, the linear shrinkage (DIN 18947:2013-08) and volume change were measured.…”

Section: Methodsmentioning

confidence: 99%

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Long-Term Behavior and Durability of Alkali-Activated Clay Mortars

et al. 2020

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The need to increase the durability of clay-based materials, due to their inherent low strength and vulnerability in contact with water, led researchers to examine different options. In this paper, clay mortars were produced using four different activating solutions. Alkali hydroxides, alkali carbonates, and alkali silicates activating solutions were used. Interest is given to long term properties while their behavior to wetting–drying and freeze–thaw cycles is recorded. In total, the results of the experiments indicated the positive effect of the potassium metasilicate on mechanical characteristics presenting, however, low performance at wetting–drying. The combination of sodium metasilicate with sodium hydroxide solution has also presented a positive effect on both mechanical and physical properties. In contrast, sodium carbonate acted better in enhancing physical properties and granting water-resistant abilities. Moreover, the performance of the specimens mixed with water–glass addition presented excellent volume stability and low mass loss in durability tests.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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