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<p>The use of composite cement containing fly ash and ground granulated blast furnace slag is picking up in practical applications due to its enhanced durability performance and low heat of hydration resulting in an environmental friendly structure. The microstructre and durability studies of such mortar using the ultrasonic pulse velocity (UPV) and rapid choride permeability tests are not observed in the research. Thus few studies are taken up in this direction and possible relationships are established among the compressive strength, UPV and RCP values. This paper reports the experimental work on the strength&#xa0;and durability characteristics of mortar specimens prepared from ordinary Portland cement (OPC) and composite cement (CC).The mortar cubes were prepared for weight proportions of 1:3, 1:4, and 1:5 (OPC/CC: Fine aggregates), with varying w/c ratios namely 0.4, 0.5, and 0.6 to study the compressive strength (CS) at 3, 7, and 28&#xa0;days. In addition, water absorption, rapid chloride permeability&#xa0;test (RCPT), chloride diffusion, and ultrasonic pulse velocity (UPV) tests were conducted to explore the quality of both cement mortars from the durability perspective. The microstructural properties of both mortars were studied using X-ray diffractograms and Fourier Transform Infrared Spectroscopy to determine&#xa0;hydration products.&#xa0;Subsequently,&#xa0;an attempt was made to establish the correlation between CS-RCPT, UPV-CS, and RCPT-UPV based on the results produced in the study. Finally, it is found that the performance of mortar with CC is superior in many aspects compared to its OPC mortar counterpart.The performance of CC mortar evaluated from diffusion analysis was superior to OPC mortar. From these studies, it is suggested that CC instead of OPC be used in all practical constructions related to mortar because of its enhanced durability. In addition, the compressive strength, water absorption, RCPT values and UPV of composite cement mortar are far better compared to OPC mortar, and hence it is recommended to use CC mortar in all field applications. The established relationships among compressive strength, UPV and RCP values are quite encouraging which can be used in the further reserach studies.</p>

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Studies on Ordinary Portland Cement and Composite Cement Mortars and the Relationship Among Compressive Strength, Rapid Chloride Permeability, and Ultrasonic Pulse Velocity

  • 期刊论文

  • 发表日期：

    2025年5月14日

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  • M. C. Nataraja,
  • Lakshmikanth Srinivasamurthy,
  • Sandeep Shegunshi

摘要

The use of composite cement containing fly ash and ground granulated blast furnace slag is picking up in practical applications due to its enhanced durability performance and low heat of hydration resulting in an environmental friendly structure. The microstructre and durability studies of such mortar using the ultrasonic pulse velocity (UPV) and rapid choride permeability tests are not observed in the research. Thus few studies are taken up in this direction and possible relationships are established among the compressive strength, UPV and RCP values. This paper reports the experimental work on the strength and durability characteristics of mortar specimens prepared from ordinary Portland cement (OPC) and composite cement (CC).The mortar cubes were prepared for weight proportions of 1:3, 1:4, and 1:5 (OPC/CC: Fine aggregates), with varying w/c ratios namely 0.4, 0.5, and 0.6 to study the compressive strength (CS) at 3, 7, and 28 days. In addition, water absorption, rapid chloride permeability test (RCPT), chloride diffusion, and ultrasonic pulse velocity (UPV) tests were conducted to explore the quality of both cement mortars from the durability perspective. The microstructural properties of both mortars were studied using X-ray diffractograms and Fourier Transform Infrared Spectroscopy to determine hydration products. Subsequently, an attempt was made to establish the correlation between CS-RCPT, UPV-CS, and RCPT-UPV based on the results produced in the study. Finally, it is found that the performance of mortar with CC is superior in many aspects compared to its OPC mortar counterpart.The performance of CC mortar evaluated from diffusion analysis was superior to OPC mortar. From these studies, it is suggested that CC instead of OPC be used in all practical constructions related to mortar because of its enhanced durability. In addition, the compressive strength, water absorption, RCPT values and UPV of composite cement mortar are far better compared to OPC mortar, and hence it is recommended to use CC mortar in all field applications. The established relationships among compressive strength, UPV and RCP values are quite encouraging which can be used in the further reserach studies.