Rheological behavior and flow induced microstructural changes of cement-based mortars assessed by Pressure Mapped Squeeze Flow

Author(s)

Grandes, Franco A. ^{[1, 2]} ; Sakano, Victor K. ^{[1, 2]} ; Rego, Andressa C. A. ^[1] ; Rebmann, Markus S. ^{[1, 2]} ; Cardoso, Fabio A. ^{[1, 2]} ; Pileggi, Rafael G. ^{[1, 2]}

Affiliation

^[1] Univ Sao Paulo, Escola Politecn, Dept Construct Engn, BR-05508070 Sao Paulo - Brazil

^[2] Natl Inst Adv Ecoefficient Cement Based Technol, Sao Paulo - Brazil

• Document type: Journal article
• Source: Powder Technology; v. 393, p. 519-538, NOV 2021.
• Web of Science Citations: 0

Abstract

Squeeze flow is used for rheological evaluation of many classes of materials. It can be performed in different configurations and is particularly interesting for heterogeneous materials that go through similar conditions during practical application. The assessment of pressure distribution during the test can provide additional information about flow conditions. For that reason, Pressure Mapped Squeeze Flow (PMSF) has been previously presented and is employed in this work with constant volume configuration for the first time. Cement-based mortars were examined, four formulated in laboratory with differences regarding the presence or not of cellulose ether admixture and hydrated lime, and one factory-produced mortar. Bulk squeeze flow results are analyzed in parallel with raw pressure distribution images. The evolution of the area as measured by the sensor is contrasted with the constant volume hypothesis. Pressure distribution calibrated results are compared to predictions from theoretical models. Flow induced microstructural changes indicated by the obtained results are explained based on the concept of interparticle spacing. The method can be useful for the rheological analysis of heterogeneous materials under partially confined flow. (c) 2021 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 11/00948-9 - Phase separation in mortars: development of evaluation method and influence on rheological behavior
• Grantee: Fábio Alonso Cardoso
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 14/50948-3 - INCT 2014: advanced eco-efficient technologies in cementitious products
• Grantee: Vanderley Moacyr John
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 12/18952-5 - Assessment of pressure distribution during Squeeze-flow of rendering mortars
• Grantee: Rafael Giuliano Pileggi
• Support Opportunities: Regular Research Grants