The chemistry of Portland cement-gasifier slag interactions

Bland, C. H.; Sharp, J. H.

doi:10.1680/adcr.1990.3.11.91

Cited by 7 publications

(3 citation statements)

References 8 publications

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“…The peak shown in Fig. 4 for OPC is a single peak, while in slag cements it is broad and can be resolved into two peaks; the first is due to the OPC component and occurs at the same time as that for the OPC sample; while the second peak is contributed mainly by the slag component, as accepted in many publications [14][15][16]. This peak in the Algerian slag blend, was delayed by approximately 3 h compared to that of the UK slag blend and its height was also less pronounced, so it only appears as a shoulder.…”

Section: Resultsmentioning

confidence: 86%

Reactivity and performance of blastfurnace slags of differing origin

Bougara

Lynsdale

Milestone

2010

Cement and Concrete Composites

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Section: Resultsmentioning

confidence: 86%

Reactivity and performance of blastfurnace slags of differing origin

Bougara

Lynsdale

Milestone

2010

Cement and Concrete Composites

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“…In this investigation, care was taken to prevent the carbonation during sample preparation and the test was carried out in a nitrogen environment. Despite this careful consideration, the probability of CH carbonation exists permanently [24]. The weight loss above 550 °C is mainly due to CO 2 release.…”

Section: Methodsmentioning

confidence: 99%

Simplex-Lattice Hydration Prediction and Microstructure Verification of Cementitious Systems

2019

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In this investigation, the age-dependent hydration development of blended pastes containing Portland cement (PC), pulverized fuel ash (PFA) and silica fume (SF) was assessed by quantifying the amount of CH and non-evaporable water using thermo-gravimetric analysis (TGA). Microstructure was investigated using scanning electron microscope (SEM). It was observed that the amount of liberated CH increases up to three-days in PC-PFA binary blended pastes, after which it progressively decreases and this reduction was proportional to the PFA dosage. The introduction of SF to PC-PFA binary mixtures to form ternary blended pastes has caused an early reduction of CH at one day where the majority of SF has been consumed during the first seven-days. The incorporation of 10% SF to PC-PFA pastes altered the low rate of hydration at early age. In addition, the presence of PFA showed insignificant influence on the non-evaporable water content until three-days then its effect became significant after seven-days. On the other hand, SF increased the non-evaporable water content from early ages up to seven-days. However, beyond 28 days, the presence of SF did not exhibit further pozzolanic activity. Furthermore, the ternary blended systems significantly increased the non-evaporable water content within three to seven days compared to the reference paste. Moreover, prediction nonlinear models of these hydration parameters were developed using the simplex-lattice design and validated against the experimental results. The latter have been further supported with SEM microstructural analysis showing good agreement between the predicted and realistic hydration.

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“…In order to evaluate the oxide passive layer formation at the interface, the calcium hydroxide content of the cement pastes was determined from the step observed in the TGA curve between 425 and 450°C, using the procedure reported by Taylor and Bland [20,21]. TGA curves can also provide information about the formation and presence of C-S-H gel, which cannot be precisely detected by XRD techniques due to its amorphous nature.…”

Section: Thermal Analysismentioning

confidence: 99%