Effect of sugar dosage on setting time, microstructure and strength of Type I and Type V Portland cements

Ahmad, Shamsad; Lawan, Adamu; Al‐Osta, Mohammed A.

doi:10.1016/j.cscm.2020.e00364

Cited by 18 publications

(29 citation statements)

References 6 publications

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“…Of note, addition of 1% titanium oxide improves cement's compressive and flexural strength [ 65 ]. Sugar with a dosage of 0.05%-0.1% can act as a set accelerator for Portland cement type Ι without harming its mechanical properties, while fewer concentrations of sugar might retard the tricalcium silicate hydration [ 66 ].…”

Section: Chemical Propertiesmentioning

confidence: 99%

Portland Cement: An Overview as a Root Repair Material

Shahi

Fakhri

Yavari

et al. 2022

BioMed Research International

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Portland cement (PC) is used in challenging endodontic situations in which preserving the health and functionality of pulp tissue is of considerable importance. PC forms the main component of mineral trioxide aggregate (MTA) and demonstrates similar desirable properties as an orthograde or retrograde filling material. PC is able to protect pulp against bacterial infiltration, induce reparative dentinogenesis, and form dentin bridge during the pulp healing process. The biocompatibility, bioactivity, and physical properties of PC have been investigated in vitro and in animal models, as well as in some limited clinical trials. This paper reviews Portland cement’s structure and its characteristics and reaction in various environments and eventually accentuates the present concerns with this material. This bioactive endodontic cement has shown promising success rates compared to MTA; however, considerable modifications are required in order to improve its characteristics and expand its application scope as a root repair material. Hence, the extensive chemical modifications incorporated into PC composition to facilitate preparation and handling procedures are discussed. It is still important to further address the applicability, reliability, and cost-effectiveness of PC before transferring into day-to-day clinical practice.

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Section: Chemical Propertiesmentioning

confidence: 99%

Portland Cement: An Overview as a Root Repair Material

Shahi

Fakhri

Yavari

et al. 2022

BioMed Research International

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“…The initial and final setting time test results of the pastes revealed that the retarding behavior of sucrose can also be observed on AAMs. Many researchers have confirmed its retarding effect on OPC materials in the past [ 40 , 41 ]. The retarding behavior of an admixture is attributed to the mechanism of adsorption or poisoning of the hydrate surface [ 52 ].…”

Section: Resultsmentioning

confidence: 99%

“…This research also studies the retardation behavior of sucrose on AAMs through setting time test since the retarding behavior of sucrose on OPC materials is reported by some researchers. Some researchers have concluded that sucrose retards the setting time and improves the microstructure of OPC concrete [ 40 , 41 ]. Besides sucrose, some other kinds of retarder are also available, such as lignosulfonic acid, hydroxycarboxylic acids, and their salts, and carbohydrates, such as glucose [ 42 ].…”

Section: Introductionmentioning

confidence: 99%

A consideration on the one-part mixing method of alkali-activated material: problems of sodium silicate solubility and quick setting

Rasuli

Tajunnisa

Yamamura

et al. 2022

Heliyon

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“…e initial and final setting times of the cement pastes of each group are shown in Figure 2. It can be observed from the data shown in Figure 2 that the initial as well as final setting times of the paste of the AA0 group increased significantly because the CA solution was added [20,33,34]. ereafter, the recorded setting time decreased gradually with the further increase in the dosage of the AA.…”

Section: Setting Timementioning

confidence: 95%

“Dormancy” and “Awakening” Method Used for Fresh Mortar Waste Recycling and Reuse

Pan

Wang

et al. 2021

Advances in Civil Engineering

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A safe and zero hazardous method is proposed to recycle and reuse fresh mortar waste. In this method, a dormancy agent and an awakening agent were used together in this study to reuse waste cement mortars. Citric acid (CA) was used as the dormancy agent to retard the hydration of cement, and an alkaline accelerator (AA) was used as the awakening agent to accelerate the hydration of cement retarded by CA at an early age. Autogenous shrinkage, dry shrinkage and quality loss, compressive strength, capillary water absorption, and rapid chloride penetration testing were performed for the mortars. A setting time test, X-ray diffraction, and thermogravimetric analysis (TGA) were performed for the pastes (without sand). The results showed that the addition of 0.3% of CA solution increased the setting time significantly. This was because the citrate ions were absorbed onto the surface of the cement particles and a protective film was formed around the cement particles to retard dissolution. However, the retarding effect was eliminated by the AA, which was mainly composed of sodium silicate due to the contribution to initial calcium consumption. With the increasing dosage of the AA, the autogenous shrinkage, dry shrinkage, water absorption, and total charges passed were increased continuously compared to the reference. However, the influence was insignificant at a low dosage of the AA (1% and 1.5%). Obviously, the compressive strengths of the mortars with the AA were increased compared with the reference at the curing times of 3 d and 7 d. On the basis of not reducing the compressive strength of mortar, the reutilization of fresh mortar waste is realized. From this work, it was found that the reuse of waste cement mortars was feasible with the combined utilization of CA and the AA, which could provide some theoretical basis and experimental data for engineering applications.

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Effect of sugar dosage on setting time, microstructure and strength of Type I and Type V Portland cements

Cited by 18 publications

References 6 publications

Portland Cement: An Overview as a Root Repair Material

Portland Cement: An Overview as a Root Repair Material

A consideration on the one-part mixing method of alkali-activated material: problems of sodium silicate solubility and quick setting

“Dormancy” and “Awakening” Method Used for Fresh Mortar Waste Recycling and Reuse

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