The effect of slaked lime, anhydrous gypsum and limestone powder on properties of blast furnace slag cement mortar and concrete

Mun, Kyung-Ju; So, Seungyoung; Soh, Yang-Seob

doi:10.1016/j.conbuildmat.2005.09.010

Cited by 33 publications

(13 citation statements)

References 2 publications

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“…Previous studies [10,26] on the role of limestone in slag cement indicated that calcite powder could refine the pore structure and improve the early strength. Therefore, an optimum content of reactive MgO (5% in this study) existed when the quantities of hydrotalcite-like phases and calcite were sufficient to give the lowest porosity and highest strength while higher contents would result in excess voluminous phases (i.e., hydrotalcite-like phases and/or brucite) and hence micro-cracks in the matrix leading to reduced strength.…”

Section: Xrd Resultsmentioning

confidence: 99%

Strength and drying shrinkage of slag paste activated by sodium carbonate and reactive MgO

Jin

Al‐Tabbaa

2015

Construction and Building Materials

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h i g h l i g h t sThe combination of reactive MgO and Na 2 CO 3 was used as an activator for slag. The effect of Na 2 CO 3 content on the strength and drying shrinkage of slag pastes was studied. Both MgOs used reduced shrinkage and increased strength of Na 2 CO 3 -activated slag. The MgO reactivity and content affected the properties of Na 2 CO 3 -activated slag remarkably. a b s t r a c tThis paper investigates the potential of combining Na 2 CO 3 and reactive MgO as a sustainable activator for ground granulated blastfurnace slag. Two very different reactivity MgOs were added at 5-10 % and the Na 2 CO 3 content varied from 4% to 8% by the weight of slag. The strength and drying shrinkage of the activated slag pastes were tested up to 90 d. It was found that the optimum reactive MgO addition was 5% regardless of the MgO type and Na 2 CO 3 content. MgO with the higher reactivity significantly increased the early strength of the paste but had almost no effect on the strength at 90 d. On the other hand, the effect of the lower reactivity MgO on the strength was more profound at later ages and low Na 2 CO 3 dosage. In terms of drying shrinkage, increasing the Na 2 CO 3 content from 4% to 6% caused a remarkable decrease of drying shrinkage while increasing it from 6% to 8% had negligible effect. X-ray diffraction and thermogravimetric analysis revealed that the major hydration products were calcium silicate hydrate gel and hydrotalcite-like phases, similar to those in conventional alkali-activated slag cements. There was also a large quantity of calcite formed especially in the 8% Na 2 CO 3 pastes due to causticisation. It was concluded that the combination of reactive MgO and Na 2 CO 3 could serve as a potential sustainable activator for slags.

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Section: Xrd Resultsmentioning

confidence: 99%

Strength and drying shrinkage of slag paste activated by sodium carbonate and reactive MgO

Jin

Al‐Tabbaa

2015

Construction and Building Materials

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“…Itim et al [41] reported that the replacement ratio of cement by 5% LS accelerated the hydration of cement and exhibited strength higher than that of PC without LS. Mun et al [42] reported that the inclusion of 2.5% LS powder in traditional PC/slag mortar system increased the early age compressive strength by 13%. Lothenbach et al [43] and De Weerdt et al [44] reported that 5% LS powder exhibited a beneficial effect on the compressive strength of conventional PC system.…”

Section: Compressive Strengthmentioning

confidence: 98%

Influence of different additives on the properties of sodium sulfate activated slag

Rashad

2015

Construction and Building Materials

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“…Limestone powder can be used to improve the properties of masonry and plastering cement. Mixing limestone powder in mortar decreases the drying shrinkage, because limestone powder is relatively inert and is classified as a kind of aggregate (Manjit and Mridul, 2002;Mun et al, 2007;Benachour et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Utilization of ground waste seashells in cement mortars for masonry and plastering

Lertwattanaruk

Makul

Siripattarapravat

2012

Journal of Environmental Management

199

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The effect of slaked lime, anhydrous gypsum and limestone powder on properties of blast furnace slag cement mortar and concrete

Cited by 33 publications

References 2 publications

Strength and drying shrinkage of slag paste activated by sodium carbonate and reactive MgO

Strength and drying shrinkage of slag paste activated by sodium carbonate and reactive MgO

Influence of different additives on the properties of sodium sulfate activated slag

Utilization of ground waste seashells in cement mortars for masonry and plastering

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