Properties of Cement Mortars Containing Phosphorous Slag

Naseroleslami, Ramin; Bakhshi, Javad; Chari, Mehdi Nemati; Yaghoobi, Mohammad Ali; Mahdi, Mojtaba Haji

doi:10.1061/(asce)mt.1943-5533.0004564

Cited by 5 publications

(7 citation statements)

References 39 publications

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“…19,27 There is also no consensus among researchers on the effect of SF on water absorption after longer periods of immersion in water because positive and negative effects of SF on 1-day and 3-day water absorption have been reported by previous research projects. 20,24,25 Positive and negligible effects of NZ on capillary water absorption, which is another index of permeability under nonhydrostatic pressure, have been also reported by previous researchers. 21,24 It is clear that the reported results on the effects of SF and NZ on permeability under nonhydrostatic pressure are not in agreement with each other.…”

Section: Introductionsupporting

confidence: 75%

“…In addition, Najimi et al showed that replacing 15% and 30% of cement weight with NZ noticeably increased 30‐min water absorption 26 but some other researchers showed that replacing various percentages of cement with SF or NZ reduced 30‐min water absorption by approximately 25% 19,27 . There is also no consensus among researchers on the effect of SF on water absorption after longer periods of immersion in water because positive and negative effects of SF on 1‐day and 3‐day water absorption have been reported by previous research projects 20,24,25 . Positive and negligible effects of NZ on capillary water absorption, which is another index of permeability under nonhydrostatic pressure, have been also reported by previous researchers 21,24 .…”

Section: Introductionmentioning

confidence: 99%

“…However, the effects of SF and NZ on permeability under nonhydrostatic pressure are not as clear as their effects on permeability under hydrostatic pressure. Some research projects showed that replacing different percentages of cement weight with SF and NZ had negligible effect on the 30‐min water absorption of concrete 20,24–26 . In addition, Najimi et al showed that replacing 15% and 30% of cement weight with NZ noticeably increased 30‐min water absorption 26 but some other researchers showed that replacing various percentages of cement with SF or NZ reduced 30‐min water absorption by approximately 25% 19,27 .…”

Section: Introductionmentioning

confidence: 99%

“…It is clear that the reported results on the effects of SF and NZ on permeability under nonhydrostatic pressure are not in agreement with each other. More importantly, the improvement in impermeability under nonhydrostatic pressure caused by the incorporation of SF and NZ was not noticeable in many cases 19,24,25 . Therefore, actions need to be taken to adopt a more effective approach to improving impermeability of cement‐based materials under nonhydrostatic pressure.…”

Section: Introductionmentioning

confidence: 99%

“…Some research projects showed that replacing different percentages of cement weight with SF and NZ had negligible effect on the 30-min water absorption of concrete. 20,[24][25][26] In addition, Najimi et al showed that replacing 15% and 30% of cement weight with NZ noticeably increased 30-min water absorption 26 but some other researchers showed that replacing various percentages of cement with SF or NZ reduced 30-min water absorption by approximately 25%. 19,27 There is also no consensus among researchers on the effect of SF on water absorption after longer periods of immersion in water because positive and negative effects of SF on 1-day and 3-day water absorption have been reported by previous research projects.…”

Section: Introductionmentioning

confidence: 99%

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Properties of cement‐based materials containing calcium stearate and supplementary cementitious materials

Chari¹,

Naseroleslami

Ahmadi³

2023

Structural Concrete

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Calcium stearate (CS) is effective to reduce permeability of different building materials under nonhydrostatic pressure but more actions need to be taken to shed light on its main and side effects on properties of cement‐based materials. This research project investigates the effect of CS on properties of these materials. Compressive strength analysis shows that the addition of CS at the dosage of 1% of cement weight reduces this parameter by approximately 20% but reducing water‐to‐binder ratio, and replacing 7.5% of cement weight with silica fume (SF) compensate for the strength loss caused by CS. Results of drying shrinkage test show that the addition of CS slightly increases drying shrinkage but replacing 7.5% of cement weight with SF can compensate for the negative effects of CS on drying shrinkage. Permeability analysis shows that CS is not as effective as SF and natural zeolite (NZ) to improve impermeability under hydrostatic pressure but it is more effective than SF and NZ to improve impermeability under nonhydrostatic pressure because the addition of CS at the dosage of 1% of cement weight reduces capillary water absorption by roughly 60%. Therefore, the simultaneous use of CS and these supplementary cementitious materials improves not only impermeability under hydrostatic pressure but also impermeability under nonhydrostatic pressure.

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