Prediction of setting for admixture modified mortars using the VCCTL

Watts, Benjamin E.; Ferraro, Christopher C.

doi:10.1016/j.cemconcomp.2016.11.002

Cited by 10 publications

(7 citation statements)

References 21 publications

(21 reference statements)

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“…By analyzing the mortars of each type of cement, it is observed that, when only HSA is added in the mixtures in its smallest rate studied, the initial setting time is already greater in 88 h for cement F -A2(0.6/0.0) and in 128h for cement Z -A3(0.9/0.0), when related to A1(0.0/0.0). This behavior may be explained by the influence of the HAS both in the setting time as well as the heat of hydration of the cement [52]. Figure 14 presents, for the mortars with cement F (a) and with cement Z (b), the effect of the increase in the rate of HSA from 0.0% to 0.6% and 0.9% for the mortars with only HAS, mortar with HAS associated with 0.2% of AEA and mortars with HAS associated with 0.4% of AEA.…”

Section: Analysis Of the Setting Times -Direct Fraction Methodsmentioning

confidence: 99%

Influence of cement type, air-entrained admixture and hydration stabilizing admixture on mortars’ setting time

Antoniazzi

Mohamad

Casali

2021

Rev. IBRACON Estrut. Mater.

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Ready mix mortar is a ready to use mixture that uses hydration stabilizing (HSA) and air-entrained (AEA) admixtures in its composition, which modify its properties, especially the setting times. HSA extends the setting time of mortars for a long period, while AEA promotes a greater workability to the mixture. The study determined the temperature of the mortars with the evaluation of the setting times obtained by a semi-adiabatic calorimeter. Two types of cement (CPII-F-40 e CPII-Z-32) and varied contents of HSA (0.0%, 0.6% e 0.9%) and AEA (0.0%, 0.2% e 0.4%) were used. The results showed that the use of HSA decreased the amplitude of the temperature peaks and increased the setting times with cement CPII-Z-32 in relation to cement CPII-F-40. The setting time of the mortars was influenced by the type of cement used and by the contents of the admixtures.

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Section: Analysis Of the Setting Times -Direct Fraction Methodsmentioning

confidence: 99%

Influence of cement type, air-entrained admixture and hydration stabilizing admixture on mortars’ setting time

Antoniazzi

Mohamad

Casali

2021

Rev. IBRACON Estrut. Mater.

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“…The final set can be related to the time when concrete heat evolution reaches its maximum rate during the acceleration period, which corresponds to the approximate midpoint of the major peak hydration process (Mindess, 2003 [36]). The use of polycarboxylate-based water reducing additives influences the setting time and heat of hydration of cement (Watts and Ferraro, 2017 [13]). The results obtained by the calorimeter tests can be seen in Figure 8.…”

Section: Setting Time Of the Mortars By Cement Hydration Heatmentioning

confidence: 99%

Stabilized mortar with air incorporator agent and plasticizer set retarder: performance measurement

Schackow

Ferrari

Effting

et al. 2019

Rev. IBRACON Estrut. Mater.

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ResumoThis study aims to develop three stabilized mortars to masonry using air entraining agents and settling retardant plasticizer to compare with a conventional mortar with lime. It was analyzed consistency index, specific gravity, air entrained content, water retentivity, setting time through the heat of hydration, mortar shrinkage/expansion, compressive strength, resistance to sulphate and tensile strength in bonding. The results exhibited that the presence of the settling retardant plasticizer affected the consistency index making the mortar more workable for a longer time. The presence of additives made the stabilized mortars lighter with lower mass density and higher incorporated air content. The presence of lime provided high water retentivity in the conventional mortar while the setting retardant plasticizer improved the water retentivity in the stabilized mortars. The initial setting time of the stabilized mortars occurred after approximately 50 hours. Conventional mortar lost its workability quickly after 2 hours. In conventional mortar, shrinkage occurred, while stabilized mortars had expansion. The conventional mortar exhibited better compressive strength, while the excess of additives can affected negatively this property in the stabilized mortars. Conventional mortar proved to be less resistant to sulphate attack. Tensile strength in bonding was better in a stabilized commercial mortar tested.Este estudo tem como objetivo desenvolver três argamassas estabilizadas para alvenaria com aditivo incorporador de ar e plastificante retardador de pega para comparar com uma argamassa convencional com cal. Foi analisado o índice de consistência, a massa específica, o teor de ar incorporado, a retenção da água, o tempo de pega através do calor de hidratação, a retração/expansão da argamassa, a resistência à compressão, a resistência ao sulfato e a resistência de aderência à tração. Os resultados mostraram que a presença do plastificante retardador de pega afetou o índice de consistência, tornando a argamassa trabalhável por mais tempo. A presença de aditivos tornou as argamassas estabilizadas mais leves, com menor densidade e maior teor de ar incorporado. A presença da cal proporcionou alta retenção de água na argamassa convencional, enquanto o plastificante retardador de pega melhorou a retenção de água nas argamassas estabilizadas. O tempo inicial de pega das argamassas estabilizadas ocorreu após aproximadamente 50 horas. A argamassa convencional perdeu sua trabalhabilidade rapidamente após 2 horas. Na argamassa convencional, ocorreu retração, enquanto que nas argamassas estabilizadas houve expansão. A argamassa convencional apresentou melhor resistência à compressão, enquanto que o excesso de aditivos pode ter afetado negativamente essa propriedade nas argamassas estabilizadas. A argamassa convencional mostrou-se menos resistente ao ataque por sulfato. A resistência de aderência à tração foi melhor na argamassa comercial estabilizada testada.Palavras-chave: argamassa estabilizada, alvenaria, tecnologia de m...

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“…The data required as input parameters (phase composition, phase fraction of clinker, particle size distribution of cement) for creating virtual cement and y ash compounds in VCCTL software are obtained from existing literature (Kaur, 2016). It is already established using proof of concept that computational modeling can emulate the performance of physical testing laboratories for heat of hydration and compressive strength testing of type I, II and III portland cements [Watts et al, 2017]…”

Section: Introductionmentioning

confidence: 99%

Prediction of Hydration Properties and Microstructure Development of Cement Mortar Using Virtual Cement and Concrete Testing Laboratory

Rastogi,

Moharana,

Subhash

2023

Preprint

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Hydration of cement is a complex phenomenon involves a simultaneous interaction between various compounds at the microscopic level. The proper monitoring of the hydration process of cement provides a better understanding of the hydration mechanism of build concrete along with increased workability, durability, and strength. The experimental techniques adopted for determining hydration and mechanical properties of cement compounds can be modelled using computational modelling tools such as the Virtual Cement and Concrete Testing Laboratory (VCCTL). This study mainly aims to predict the properties of ordinary Portland and pozzolanic cement mortar indigenous to India using VCCTL. The material data required as input parameters for creating virtual cement and fly ash are obtained from the previous studies. The calculated hydration and strength properties, such as heat of hydration, chemical shrinkage, degree of hydration, compressive strength and microstructure development of previous studies are validated using the VCCTL.

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Prediction of setting for admixture modified mortars using the VCCTL

Cited by 10 publications

References 21 publications

Influence of cement type, air-entrained admixture and hydration stabilizing admixture on mortars’ setting time

Influence of cement type, air-entrained admixture and hydration stabilizing admixture on mortars’ setting time

Stabilized mortar with air incorporator agent and plasticizer set retarder: performance measurement

Prediction of Hydration Properties and Microstructure Development of Cement Mortar Using Virtual Cement and Concrete Testing Laboratory

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