Final Setting Time Research Articles

Application of consistency-based water-to-binder ratio to compensate workability loss in concrete modified with rice husk ash

Rice husk ash is a material that has the potential to replace cement partially. Many research works concluded that besides having some environmental advantages, the use of rice husk ash (RHA) also improves the hardened properties of concrete. This experimental study addresses the effect of the RHA on the basic properties of ordinary Portland cement by evaluating the standard consistency, initial setting time, and final setting time of RHA-added cement. This study also presents the fresh and hardened properties of concrete modified with RHA. The replacement of cement was done with five different percentages (0%, 5%, 10%, 15%, and 20%) of RHA. Samples were also segregated based on the two different methods of the selection of water to binder (w/b) ratio. In the first method w/b ratio was kept constant at 0.45 for all cement replacement percentages (RHA%). In the second method, the w/b ratio was selected based on the standard consistency of the modified cement. The findings of the experimental study show that standard consistency is increased with the increment in RHA%. A small increase in the initial setting time can be noticed with lower RHA% (5% and 10%), however, higher RHA% causes a decrease in the initial setting time. No significant change in the final setting time was found due to the addition of RHA. The workability of the concrete decreases significantly with respect to RHA% in the case of constant w/b ratio samples. But in consistency-based w/b ratio samples, RHA% has an insignificant effect on workability. The compressive strength of concrete increases with the increase in RHA% up to a 10% value for the constant w/b ratio samples. However, an insignificant change was noticed due to RHA% when the consistency-based w/b ratio had been applied. The study concludes that the strength of concrete can be improved by cement replacement with RHA with some sacrifice in terms of workability. But if we add extra water to compensate for the workability loss, we can replace cement with RHA without any significant strength loss.

Utilization of textile and tannery sludges in cement mortar

The aim of this study is to investigate the characteristics of Textile ETP and Tannery sludges and strength characteristics of cement-sludge mortar. The textile Effluent Treatment Plant (ETP) and tannery sludges have the potential to become a serious environmental burden for Bangladesh in the future because of their high rate of generation, with a very limited safe disposal option. On the other hand, day by day the demand and price of cement are increasing. This study was devoted to evaluate the technical feasibility of utilizing textile ETP and tannery sludges in cement mortar both as separate and mixed modes. An attempt was taken to replace 5%, 10%, 15% and 20% by weight of cement in mortar with textile ETP and tannery sludges both as a separate and mixed modes. To evaluate the characteristics of the textile ETP and tannery sludges, the pH, moisture content, organic matter content, chemical composition (XRF), TCLP (Heavy Metal) tests were studied. The initial and final setting time, compressive strength, tensile strength, and water absorption of mortar by partial replacement of cement by textile ETP and tannery sludges both as separate and mixed modes were studied to evaluate the properties of cement-sludge mortar. It was found that the textile ETP and tannery sludges both as separate and mixed modes can be a replacement of cement up to 10% in cement mortar and can be used for the purposes of S-type of mortar. The textile ETP sludge as a separate and mixed modes of the sludges can be a replacement of cement up to 20% and can be used for the purposes of N-type of mortar.

Influence of Nickel in water on properties of Ordinary Portland Cement Concrete

The study is aimed at investigating the effect of presence of Nickel in water on setting times and compressive strength of cement concrete. In the present study, the effect of Nickel (Ni) on setting time and compressive strength of cement is assessed under laboratory conditions. The research programme included tests of setting times and Mechanical strengths up to 28 days. In this research, the cement concrete cubes were cast with deionised water and deionised water containing the Nickel ions at various concentrations. The concentrations of Nickel (Ni) tested for different samples are 10, 50, 100, 500, 1000, 2000, 3000, 4000 and 5000 mg/L. The experimental results show that the presence of Nickel in deionised water accelerate both initial and final setting times up to 2000 mg/L. Nickel in deionised water up to 2000 mg/L there is a nominal change in compressive strength at early age (3-day). Beyond 2000 mg/L there is a significant change in the compressive strength at early ages as well as 28-day. Comparison of the Nickel with those of control mix levels reveal that the presence of Nickel increases the compressive strength. The rate of increase in compressive strength is with increase in concentration of Nickel.

Effect of Crushed Clay Brick as Partial Replacement of Fine Aggregate in Concrete

The reuse of construction and demolition wastes, especially crushed clay bricks (CCB), represents a major contribution to the environment. Due to the nature of clay bricks, it can be considered as source of fine and coarse aggregate to produce structural concrete. This research has been conducted with the objectives of highlighting the effect of crushed clay brick as partial replacement of fine aggregate in concrete. Compressive strength of concrete made by different partial replacement of fine aggregates were evaluated on (0%,15%, 25%, 30%, 50%, and 75%). To achieve the objectives of this study, the laboratory tests have been performed. The strength of gravels has been investigated by Los Angles Abrasion test according to ASTMC 131. Sieve analysis was performed to determine the particle size distribution. The consistency and fineness test of Cimerwa cement was conducted and results of fineness of cement was 9.165%. Initial setting time was 98 minutes and final setting time was 256 minutes. The compressive strength of concrete was performed and the results at age of 28 days were 31.81Mpa, 29.38Mpa, 27.45Mpa, 24.86Mpa, 17.91Mpa and 15.84Mpa respectively. The percentage reductions for (15%, 25%, 30%, 50% and 75%) was 7.63%, 13.70%, 21.84%, 43.69% and 50.20% respectively. According to IS 456 specified minimum compressive strength of concrete after 28 days of curing is 25N/mm2 for M25 grade of concrete, with the partial replacement of 20%, the resulted compressive strength is 27.45 Mpa.

The influence of silane coupling agents on the properties of α-TCP-based ceramic bone substitutes for orthopaedic applications.

Biomaterials based on α-TCP are highly recommended for medical applications due to their ability to bond chemically with bone tissue. However, in order to improve their physicochemical properties, modifications are needed. In this work, novel, hybrid α-TCP-based bone cements were developed and examinated. The influence of two different silane coupling agents (SCAs) - tetraethoxysilane (TEOS) and 3-glycidoxypropyl trimethoxysilane (GPTMS) on the properties of the final materials was investigated. Application of modifiers allowed us to obtain hybrid materials due to the presence of different bonds in their structure, for example between calcium phosphates and SCA molecules. The use of SCAs increased the compressive strength of the bone cements from 7.24 ± 0.35 MPa to 12.17 ± 0.48 MPa. Moreover, modification impacted the final setting time of the cements, reducing it from 11.0 to 6.5 minutes. The developed materials displayed bioactive potential in simulated body fluid. Presented findings demonstrate the beneficial influence of silane coupling agents on the properties of calcium phosphate-based bone substitutes and pave the way for their further in vitro and in vivo studies.

Chemical analysis of mineral trioxide agregate mixed with hyaluronic acids as an accelerant.

Mineral trioxide aggregate (MTA) has many clinical applications in dentistry; the main drawback is the long setting. The main objective is to investigate and compare the chemical effect of using two commercially available hyaluronic acid hydrogels (HA) instead of distilled water for mixing MTA as an accelerant of setting time. Test materials were divided into three groups; Group 1: (control) mixing MTA with distilled water supplied by the manufacturer; Group 2: mixing MTA with a hybrid cooperative complex of high and low molecular weight HA (Profhilo®); Group 3: mixing MTA with High molecular weight / non-cross-linked HA (Jalupro®). Mixing time, and setting time (initial and final) were determined, Fourier-transform infrared spectroscopy, Energy-dispersive X-ray spectroscopy, Field emission Scanning Electron Microscopy, and X-ray diffraction were performed. mixing time, initial, and final setting time for (MTA + HA) groups were significantly different and lower in comparison to the control group (p < 0.05). This study revealed higher expression of calcium silicate hydrate and calcium hydroxide expression with higher Ca release in the MTA + HA group than the control group. commercially available HA demonstrated better chemical properties when used as a mixing medium for MTA. The Mixing and setting time for MTA + HA group were significantly shorter than those of the control group were. Thus, commercially available HA can be used as a mixing medium for MTA.

Influence of alkaline activator solution ratio on the properties of biomass fly ash-based alkali-activated materials

This study explored the use of untreated high-carbon biomass fly ash (BFA) and less alkaline Na2CO3 as an activator to create alkali-activated materials (AAM). This article investigated how the Na2CO3/Na2SiO3 (SC/SS) ratio of the alkaline activator solution (AAS) influenced the setting time, structural development and physical-mechanical properties of BFA-based AAM pastes that were cured at room temperature. With an increase in the SC/SS ratio, AAM pastes’ initial and final setting times shorten, respectively. The AAM sample with the lowest density and ultrasonic pulse velocity (UPV) value also has the maximum water absorption. The compressive strength of AAM samples dropped after 7 days of curing while the SC/SS ratio increased. Nevertheless, after 28 days of curing, the compressive strength of AAM samples rose with a rising SC/SS ratio. The results for density, water absorption, and UPV were corroborated by the scanning electron microscope (SEM) analyses, which demonstrated that when the SC/SS ratio rises, the structure of the samples gets denser and more homogeneous, in line with the increased compressive strength of the samples.

Influence of Coconut Shell Ash and Glass Powder as Partial Replacement of Cement in Concrete: An Experimental Study

Abstract: The amount of garbage generated by industrial and agricultural activities on the earth's surface has given rise to concerns about the environment's sustainability and the planet's ecosystem. Because waste generation generates CO2 and other hazardous gases during disposal or manufacturing, it contributes to global warming. In this investigation, the cement is replaced by waste materials such as Coconut Shell Ash (CSA) and Glass Powder (GP). Using CSA and GP with cement replacements of 0%, 2.5%, 5%, 7.5%, 10%, and 12.5%, more than 108 specimens have been prepared in laboratory and examined. After being mix designed , the concrete is mixed in a ratio of 1:2.03:3.10 by weight of cement sand and coarse aggregate at water/cement ratio of 0.55. Initial setting, final setting time, compressive strength, split tensile strength, and flexural strength are among the qualities of concrete and cement that have been investigated.

Development of New Composites Using Industrial by Products

In this paper thesis describes an experimental investigation of magnesium based cement mortar which consists of fly ash, magnesium oxide (MgO), magnesium Phosphate (MgPO4) and Phosphate tailings. This magnesia based cements are emerged as a viable alternative to Portland cement, with both technical and sustainability advantages. This study aims to use the mixture of cement, fly ash and magnesia. The major drawback of delayed setting time can be eliminated with the use of magnesia based cement. Hence, in this study different admixtures such as magnesium oxide, magnesium phosphate, phosphate tailings are attempted. Initial and final setting time of plain cement, fly ash cement and magnesia based cement are determined and found that the small dosage of magnesium compound reduced the setting time. Further, magnesia based cements are reported to be used along with sea water without much negative effect. In view of all these, this study proposed a magnesia based cement as an alternative for conventional Portland cement. Industrial wastes such as fly ash, and phosphate tailings are used in this study.

Effect of composition and curing on alkali activated fly ash-slag binders: Machine learning prediction with a random forest-genetic algorithm hybrid model

The final setting time (FST) and uniaxial compressive strength (UCS) are critical parameters for designing the mixture proportions of alkali-activated materials (AAMs). To understand the influence of the mixture composition on FST and UCS of AAMs, two datasets containing 616 samples for UCS and 278 samples for FST were compiled from published literature. A random forest (RF) model was developed on these datasets to predict FST and UCS of AAMs. The hyperparameters of the RF model were optimized using the Genetic Algorithm (GA). Results show that the hybrid GA-RF model achieved the highest prediction accuracy on the test set of UCS (0.932) and FST (0.997), compared to other machine learning models. The developed model was then used to interpret the influence of mixture composition on FST and UCS. The curing time and water content significantly influenced the UCS, while Na/Al and water contents were more important to FST. The microstructure development of the AAMs was affected by Ca/Si, Na/Al and Si/Al ratios. To achieve better UCS, the recommended Ca/Si varied from 1 to 2; Na/Al was slightly lower than 1 and Si/Al ratios changed between 2.5 and 3.5. This study can facilitate the mixture optimization for FA-slag based AAMs.

Physical Properties of Different Brands of Cement Manufactured in KPK, Pakistan: A Case Study

One of the key elements affecting structural concrete's strength and longevity is the cement's quality. In Pakistan, large amounts of cement are utilized in construction projects. This study appraised some physical properties of five brands of Portland cement bought from cement industries in KPK. Cement brands are investigated, including Cherat cement, Askary cement, Luckey cement, Kohat +, and Bestway cement. The composition of the cement has been recorded from the cement bags. Each initial setting time, normal consistency, final setting time, fineness, and compressive strength cement samples (collected as bags from the market) have been tested in the laboratory at three days, seven days, 14 days, and 28 days per ASTM standards. Amongst these various cement brands in KPK, we aim to investigate the best cement brands taking into consideration the above all physical test and then test these brands after three months. Taking time as a factor, the best cement quality is to be found. According to the fineness of cement, Cherat cement is found to be the best amongst all five brands of cement when tested initially, while lucky and Kohat were the least in fineness properties. Consistency tests were performed for all brands of fresh types of cement, and Cherat and Kohat have more consistency, while Askary has the least consistency. Initial and Final setting time tests were performed for all brands, and Cherat cement was found to have the more initial and final setting time, while Kohat and Askary had the least setting time. In the case of the compressive strength test, Cherat cement was found to be the greater strength, while lucky had the least compressive strength. For seven days curing. For 28 days curing Cherat cement was the best one having greater strength, while Askary had the least strength among all. All the cement brands were tested the same way after three months of age, which shows that all five brands crossed the ranges for each test. Still, it has been observed that the decrease in the fineness is small for Cherat compared to all other brands while in case of compressive strength, the decrease in Cherat is greater than all other brands.

Experimental Research on the Workability and Mechanical Properties of Grouting Materials with Nano-Oxides

This work studied the effect of the nano-oxides, such as Nano-Fe2O3 (NF), Nano-Al2O3 (NA), Nano-MgO (NM), and Nano-SiO2 (NS), on the workability and mechanical properties of quick-setting grouting materials serviced in the underground environment. The results show that 2.0% NS could remarkably shorten the setting time of the grouting materials by 29.16%, compared to the control one (without nano-oxides), and the final setting time was shortened by 46.51%. The results also show that 2.0% NS could decrease the initial fluidity of the grouting material by 41.09%, compared to the control one, and the 30 min fluidity was decreased by 48.93%. The XRD results show that NF, NM, and NS contribute to a higher quantity of AFt than that NA. Moreover, grouting material doped with NF, NM, and NS produces more needle-like ettringite, leading to a more compact structure.

Roles of recycled fine aggregate and carbonated recycled fine aggregate in alkali-activated slag and glass powder mortar

Alkali-activated materials have attracted a lot of research interest due to the advantage of less CO2 emission than ordinary Portland cement (OPC) systems. The use of recycled aggregate or carbonated recycled aggregate in new concrete is considered a good way to solve the problem of construction and demolition waste. This study aims to investigate the influences of recycled fine aggregate (RFA) and carbonated RFA (CRFA) on the properties of alkali-activated slag and glass powder mortar (AASGM). The macro properties (compressive strength, workability, setting time, and shrinkage) and microstructural properties of AASGMs prepared with RFA/CRFA were evaluated. The hydration evolutions of AASGMs and the reactions between RFA/CRFA and sodium silicate were investigated to explore the reaction mechanisms of AASGM with RFA/CRFA. The results showed that with the increase in RFA content from 0 % to 100 %, the flow value of AASGM decreased from 240 mm to 145 mm, the initial setting time was shortened by 44 %, the 7 days autogenous shrinkage decreased by 82 %, the 25 days drying shrinkage decreased by 31 %, and the 28 days compressive strength firstly increased (RFA content ≤ 50 %) and then decreased. On the contrary, with the increase in CRFA content from 0 % to 100 %, the flow value of AASGM increased from 240 mm to 270 mm, the final setting time increased by 37 %, and the compressive strength decreased by 97 %. The roles of RFA and CRFA in AASGM were different from their roles in OPC-based materials. That was because the calcium hydroxide in RFA could react with sodium silicate (SS) and increase the concentration of alkali, which accelerated the polymerization reaction of AASGM. However, the calcium carbonate and silica gel in CRFA reacted with SS and reduced the concentration of alkali, and thus the polymerization reaction of AASGM was decelerated.

Analysing the Effect of Cassava Flour as a Mixture on the Physical, Mechanical, and Durability Properties of High-Strength Concrete

The availability, cost, and environmental impact of chemical admixtures are reduced when natural substitute materials are incorporated into the concrete as an admixture. This paper outlines the findings of a study that looked at the physical characteristics of fresh and hardened concrete made with Portland pozzolanic cement CEM II/B-P blended with cassava flour up to 5% by weight of cement. A low water/binder ratio of 0.35 was used together with a carboxylate-based superplasticizing admixture to produce high strength. In fresh-state concrete, the initial and final setting times, soundness, and consistency were found to increase with increased cassava flour content, whereas the compacting factor and slump were observed to decrease. In the hardened state, compressive strengths were determined at 3, 7, 14, 28, 56, and 90 days, while split tensile and flexural strengths were investigated at 28 days. Similarly, dry density and porosity were also investigated at 28 days. Water absorption was also studied as a potential indicator of durability in hardened concrete. Scanning electron microscopy characterization of cassava flour revealed porous particles of irregular shape. On the other hand, X-ray diffraction imaging showed that the primary chemicals in cassava flour are silicon dioxide (50%), calcium oxide (17%), and aluminium oxide (7%). All of the mixes that incorporated cassava flour were stronger than the control mix, with the 3% cassava flour combination producing the best results. Doi: 10.28991/CEJ-2022-08-12-015 Full Text: PDF

Does the ultrasonic activation of calcium silicate-based sealers affect their physicochemical properties?

This study aimed to evaluate the influence of ultrasonic activation (UA) on the physicochemical properties of hydraulic calcium silicate-based sealers. Nine experimental conditions were created based on the hydraulic calcium silicate-based sealers (Bio-C Sealer, Sealer Plus BC and Bio Root RCS) and the ultrasonic activation (no activation [NA], 10 seconds, and 20 seconds). Then the experimental groups were BC-NA, BC-10, BC-20, SPBC-NA, SPBC-10, SPBC-20, BR-NA, BR-10, and BR-20. Activation was performed with an ultrasonic insert 20/.01. The mold for the physicochemical analysis was filled and evaluated according to the ANSI/ADA specification nº. 57: initial and final setting time, flow, radiopacity and solubility. Tests were also performed to evaluate pH and calcium ion release with experimental periods of 1, 24, 72, and 168 hours with a pH meter and colorimetric spectrophotometer. Data were analyzed by one-way analysis of variance and post-hoc Tukey tests. The significance level was set at 5%. The time of UA progressively delayed the initial setting time for all hydraulic calcium silicate-based sealers (p < 0.05). Twenty seconds of UA increased the mean flow values of Sealer Plus BC and Bio-C Sealer compared to NA (p < 0.05). UA did not influence the radiopacity and solubility of the tested sealers (p > 0.05). UA for 20 seconds enhanced the pH levels and the calcium ion release of Sealer Plus BC and Bio-C Sealer at 168h (p < 0.05). UA for twenty seconds interferes with some physicochemical properties of hydraulic calcium silicate-based sealers.

Mechanical behavior of flowing concrete and early strength concrete with the addition of type D and F admixtures

Flowing concrete (FC) and self-compacting concrete (SCC) that are produced with admixtures can be a solution to the complexity of construction problems. Self-compacting concrete is a special type of flowing concrete, but flowing concrete is not necessarily self-compacting concrete. This paper investigates the adding type D and F admixtures with andesite stone as the potential local coarse aggregate materials which were abundantly available for flowing concrete and early strength concrete (ESC) performance. This study has two test categories: fresh concrete and hardened concrete. The fresh concrete category includes slump, slump flow, and T500 tests. Meanwhile, the hardened concrete category includes compressive, splitting tensile, and flexural strength tests. The experimental results indicated that the admixture type F dosage of 1.0%, 1.55% and 1.75% cement weight can enhance the compressive strength by 3.88%, 5.82% and 9.71% respectively. The combination of type F and D admixtures with dosage of 0.15% and 0.2% cement weight show a reduction in compressive strength by 12.62% and 3.89% respectively. On the other hand, both combination of admixtures can reach better performance on the final setting time which lead the slows the hydration process and provides adequate time to put concrete to the formwork. The results also show adequate correlations between compressive strength and the flexural strength. Furthermore, a prediction model is established the ratio of both value (𝑓𝑓𝑡𝑡𝑡𝑡𝑡𝑡/𝑓𝑓𝑐𝑐 ' ) based on the regression analyses, while it decreases obviously with the increase of compressive strength. It can be clearly that the ratio is strongly affected by compressive strength.

Potential of industrial waste as alternative alkaline activator for development of eco-efficient mortars

The alkali-activated materials (AAMs) design can be viewed as one of the most investigated fields in building materials engineering. However, despite numerous studies aimed at the utilization of various precursors, very limited attention is paid to the utilization of waste alkali sources as an alternative to commercial activators. In this regard, this study provides a novel approach to the utilization of industrial waste alkalis as a replacement for commercial alkali activators to reduce costs and reduce the environmental burden. The main innovation consists in the utilization of a waste-cleaning solution (SWCA) as an alternative alkaline activator for blast furnace slag to improve the environmental and economic efficiency and preserve functional properties. The functional properties of designed alkali-activated mortars are described by the setting time, pore size distribution, and mechanical strength. To comply with sustainable measures, the carbon dioxide emissions and costs analysis associated with the material production are carried out. The obtained results reveal the great potential of waste alkaline sources as a replacement for commercial activators. The increase in the applied SWCA concentration induced a shortening in the initial setting time from 240 to 120 min and the final setting time from 480 to 245 min. The designed mixtures reached a satisfactory level of mechanical strength (25 MPa) in comparison to low-grade cement mortars together with a substantial reduction in environmental burden excluding the avoided production. Specifically, a carbon footprint of 75 kg/m3 CO2 equivalent was achieved which represents 5 times lower values compared to low-grade concrete and even better value than AAMs based on a commercially-produced activator. Significant improvements were achieved also in cost efficiency per cubic meter as it was dropped to approx 40 €/m3, thus designed alkali-activated mortars provide better cost efficiency per cubic meter over traditional binders. The findings show that AAMs based on waste alkaline activator should of particular attention to materials science as lowers the consumption of energy-intensive sources and represent a valuable step toward a circular economy.

Impact of chitin nanofibers and nanocrystals from waste shrimp shells on mechanical properties, setting time, and late-age hydration of mortar

Every year ~ 6–8 million tonnes of shrimp, crab, and lobster shell wastes are generated, requiring costly disposal procedures. In this study, the chitin content of shrimp shell waste was oxidized to produce chitin nanocrystals (ChNC) and mechanically fibrillated to obtain chitin nanofibers (ChNF) and evaluated as additives for mortar. ChNF (0.075 wt%) and ChNC (0.05 wt%) retarded the final setting time by 50 and 30 min, likely through cement dispersion by electrostatic repulsion. ChNF (0.05 wt%) with a larger aspect ratio than ChNC resulted in the greatest improved flexural strength and fracture energy by 24% and 28%. Elastic modulus increased by up to 91% and 43% with ChNC and ChNF. Solid-state nuclear magnetic resonance (NMR) showed ChNF (0.05 wt%) enhanced calcium–silicate–hydrate structure with a 41% higher degree of polymerization, 9% more silicate chain length, and a 15% higher degree of hydration at 28 days. Based on the findings, chitin seems a viable biomass source for powerful structural nanofibers and nanocrystals for cementitious systems to divert seafood waste from landfills or the sea.

Reutilization of gangue wastes in phosphogypsum-based excess-sulphate cementitious materials: Effects of wet co-milling on the rheology, hydration and strength development

This paper presents an experimental study on the effects of calcined gangue and wet co-milling on the properties of phosphogypsum-based excess-sulphate cementitious materials (PESCMs), including setting time, rheology, heavy metal solidification and strength development. For PESCMs containing 0%-50% calcined gangue, with and without wet co-milling, we examined hydration and microstructural evolution. Results indicate that the addition of calcined gangue shortens the initial and final setting time of fresh PESCM pastes, and impairs stability, fluidity and strength development. After wet co-milling, the rheological and mechanical properties of PESCM pastes are improved, where the binders with 10–20% calcined gangue show a 40% increase in 28-d compressive strength. Hydration of calcined gangue is rapid and weakens the retarding effect of impurities, providing more active aluminates and silicates for further hydration. Wet co-milling promotes physical dispersion, chemical dissolution and thus hydration, which helps refine microstructure for a better development of strength and heavy metal solidification capability.

Effects of a mineralization-promoting peptide on the physical and chemical properties of mineral trioxide aggregate

Mineral trioxide aggregate (MTA) has been used widely in dentistry due to its sealing ability and biocompatibility. Delayed setting time is one of the major limitations of MTA. Various additives have been studied to further improve the properties of MTA with varied degrees of success. In this study, we have investigated the effect of a calcium phosphate mineralization promoting-peptide (MPP3) on the physical and chemical properties of MTA in comparison with Na2HPO4. Based on the reported effects of MPP3 on calcium-phosphate mineralization reaction, our hypothesis was that MPP3 may also show beneficial effects on the calcium-silicate mineralization system of MTA. Na2HPO4 was used for comparison since its setting accelerant effect on MTA has been well documented. The cements were prepared by mixing with distilled water, 0.40 mM MPP3 solution, 15% Na2HPO4 solution, and a combination of MPP3 and Na2HPO4 solution. Initial and final setting times were measured via Vicat needle. Microhardness values were measured via Vickers indenter at 1,3,7, and 28 days after hydration. Compressive strength after setting was measured via universal testing machine. Morphological and compositional analyses were performed via FESEM imaging, XRD and Raman spectroscopy. The microhardness data was evaluated via repeated-measures ANOVA. Setting time and compressive strength data were evasluated via one-way ANOVA. Initial setting time was reduced to ∼3 min in the Na2HPO4 containing groups but remained at ∼5 min in the control and MPP3 groups. Final setting times were significantly reduced in all groups compared to the control group. The reduction in the final setting times in the Na2HPO4 containing groups were significantly higher compared to the MPP3 group. Microhardness was significantly higher in the MPP3 group at all time points. No statistically significant difference in compressive strength was observed among the groups. FESEM analysis showed presence of ettringite crystals in the MPP3 group, and NaBiO3 crystals in the Na2HPO4 containing groups. XRD analysis showed a broadening of peaks at 2θ = 32° in the Na2HPO4 containing groups, possibly due to presence of NaBiO3. Raman spectroscopy showed statistically higher ettringite content in the MPP3 containing groups. Our findings indicate that MPP3 is a beneficial additive to eliminate some of the drawbacks associated with MTA with no detrimental effects on mechanical properties and without resulting in phases that potentially cause discoloration, such as NaBiO3. We propose that the reduced final setting time and increased microhardness by MPP3 may be associated with the increased ettringite content. Future studies, where wider range of MPP3 concentrations are studied may help elucidate and optimize the beneficial effects of MPP3 observed in this study.