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A platform for research: civil engineering, architecture and urbanism
Improvement of Mechanical and Microstructure Properties of Modified Fly Ash-Blended Low Carbon Cement with Hydroxy Propyl Methyl Cellulose Polymer
https://orcid.org/http://orcid.org/0000-0002-2512-2659
This paper highlights the synergetic effects of semi-synthetic cellulose, such as hydroxypropyl methylcellulose (HPMC) and supplementary cementitious material, such as pulverized fly ash (PFA) on consistency, setting time, hydration kinetics, compressive strength, and thermal-cum-microstructural properties of ordinary Portland cement (OPC) paste. The experimental program consisted of 23 OPC paste mixes, prepared with varying content of HPMC (0.2%, 0.6% and 1% wt of dry mix) and PFA content ranging from 10 to 30% with an increment of 5% in PFA fractions. To see the influence of HPMC; water to binder (w/b) ratio was fixed at 0.32. An automatic Vicat apparatus and Isothermal calorimeter was used to study setting times and heat flow during hydration of HMPC–PFA-modified low carbon cement paste. X-ray diffraction (XRD), Thermo-gravimetry/differential thermo-gravimetry analysis (TG/DTG), and Scanning Electron Microscopy (SEM) were employed to observe the polymer–cement interaction, and surface morphology of OPC and binary/ternary (OPC–PFA/HPMC) cement paste. The results showed that at fixed w/b ratio; consistency of binary cement paste mix (OPC–FA0–1HPMC) was evidently improved due to viscosity modifying properties of HPMC. The heat flow results indicated that both the admixtures (HPMC and PFA) retarded heat of hydration. However, at 90 days, compressive strength of ternary cement paste mix (OPC–FA15–0.6HPMC) was 12.5% and 52.54% higher as compared to control paste mix (OPC) and binary cement paste mix (OPC–0.6HPMC). XRD and SEM results also revealed that HPMC–PFA promotes massive calcium silicate hydrate (C–S–H) gel formation; resulting in dense-cohesive and homogeneous microstructure which was observed by TG/DTG study, too.
Improvement of Mechanical and Microstructure Properties of Modified Fly Ash-Blended Low Carbon Cement with Hydroxy Propyl Methyl Cellulose Polymer
https://orcid.org/http://orcid.org/0000-0002-2512-2659
This paper highlights the synergetic effects of semi-synthetic cellulose, such as hydroxypropyl methylcellulose (HPMC) and supplementary cementitious material, such as pulverized fly ash (PFA) on consistency, setting time, hydration kinetics, compressive strength, and thermal-cum-microstructural properties of ordinary Portland cement (OPC) paste. The experimental program consisted of 23 OPC paste mixes, prepared with varying content of HPMC (0.2%, 0.6% and 1% wt of dry mix) and PFA content ranging from 10 to 30% with an increment of 5% in PFA fractions. To see the influence of HPMC; water to binder (w/b) ratio was fixed at 0.32. An automatic Vicat apparatus and Isothermal calorimeter was used to study setting times and heat flow during hydration of HMPC–PFA-modified low carbon cement paste. X-ray diffraction (XRD), Thermo-gravimetry/differential thermo-gravimetry analysis (TG/DTG), and Scanning Electron Microscopy (SEM) were employed to observe the polymer–cement interaction, and surface morphology of OPC and binary/ternary (OPC–PFA/HPMC) cement paste. The results showed that at fixed w/b ratio; consistency of binary cement paste mix (OPC–FA0–1HPMC) was evidently improved due to viscosity modifying properties of HPMC. The heat flow results indicated that both the admixtures (HPMC and PFA) retarded heat of hydration. However, at 90 days, compressive strength of ternary cement paste mix (OPC–FA15–0.6HPMC) was 12.5% and 52.54% higher as compared to control paste mix (OPC) and binary cement paste mix (OPC–0.6HPMC). XRD and SEM results also revealed that HPMC–PFA promotes massive calcium silicate hydrate (C–S–H) gel formation; resulting in dense-cohesive and homogeneous microstructure which was observed by TG/DTG study, too.
Improvement of Mechanical and Microstructure Properties of Modified Fly Ash-Blended Low Carbon Cement with Hydroxy Propyl Methyl Cellulose Polymer
https://orcid.org/http://orcid.org/0000-0002-2512-2659
This paper highlights the synergetic effects of semi-synthetic cellulose, such as hydroxypropyl methylcellulose (HPMC) and supplementary cementitious material, such as pulverized fly ash (PFA) on consistency, setting time, hydration kinetics, compressive strength, and thermal-cum-microstructural properties of ordinary Portland cement (OPC) paste. The experimental program consisted of 23 OPC paste mixes, prepared with varying content of HPMC (0.2%, 0.6% and 1% wt of dry mix) and PFA content ranging from 10 to 30% with an increment of 5% in PFA fractions. To see the influence of HPMC; water to binder (w/b) ratio was fixed at 0.32. An automatic Vicat apparatus and Isothermal calorimeter was used to study setting times and heat flow during hydration of HMPC–PFA-modified low carbon cement paste. X-ray diffraction (XRD), Thermo-gravimetry/differential thermo-gravimetry analysis (TG/DTG), and Scanning Electron Microscopy (SEM) were employed to observe the polymer–cement interaction, and surface morphology of OPC and binary/ternary (OPC–PFA/HPMC) cement paste. The results showed that at fixed w/b ratio; consistency of binary cement paste mix (OPC–FA0–1HPMC) was evidently improved due to viscosity modifying properties of HPMC. The heat flow results indicated that both the admixtures (HPMC and PFA) retarded heat of hydration. However, at 90 days, compressive strength of ternary cement paste mix (OPC–FA15–0.6HPMC) was 12.5% and 52.54% higher as compared to control paste mix (OPC) and binary cement paste mix (OPC–0.6HPMC). XRD and SEM results also revealed that HPMC–PFA promotes massive calcium silicate hydrate (C–S–H) gel formation; resulting in dense-cohesive and homogeneous microstructure which was observed by TG/DTG study, too.
Improvement of Mechanical and Microstructure Properties of Modified Fly Ash-Blended Low Carbon Cement with Hydroxy Propyl Methyl Cellulose Polymer
Iran J Sci Technol Trans Civ Eng
Kumar, Rajesh (author) / Tomar, Priyanka (author) / Srivastava, Abhishek (author) / Lakhani, Rajni (author) / Chibber, V. K. (author)
2022-12-01
14 pages
Article (Journal)
Electronic Resource
English
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