Journal
JOURNAL OF BUILDING ENGINEERING
Volume 43, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jobe.2021.103130
Keywords
Cement materials; Polyacrylamide; Air-entraining; Bulk density; Extrusion
Funding
- Conselho Nacional de Desenvolvi-mento Cientifico e Tecnologico (CNPq) [484082/2013-2, 312108/2015-0, 307723/2017-8]
- Fundacao de Amparo a ` Pesquisa do Estado de Minas Gerais (FAPEMIG) [CAG-APQ-01188-11]
- Fundacao de Amparo a ` Pesquisa do Estado de Sa o Paulo (FAPESP) [2012/51467-8]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Research Nucleus on Materials for Biosystems (Biosmat, FZEA/USP)
- Nanotechnology Network for Research in Agri-culture-Rede AgroNano/Embrapa
- Rede Brasileira de Compositos e Nanocompositos Lignocelulosicos (RELIGAR, UFLA)
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The research successfully developed lightweight cement-based boards by adding different percentages of SAP, which decreased the density of the cement boards. However, increasing the percentage of SAP resulted in higher apparent porosity of cement boards, affecting the microstructure and mechanical performance significantly.
The extrusion process has numerous advantages in the production of cement materials; however, cement extruded products over gain bulk density, adding costs to their fixation, workability, and application as structural reinforcement. The objective of this research was to develop and test extruded lightweight cement-based boards with the addition of superabsorbent polymer (SAP). A plain cement board containing 70% of cement and 30% of limestone filler was prepared. The different percentages of SAP from 0.0 to 2.0% based on cement mass did not interfere in the extrusion process. However, an expansion of the cement boards containing 1.0, 1.5, and 2.0% SAP occurred when passing through the extruder nozzle. The apparent porosity increased, and millimetric voids arose in the cement boards by increasing the SAP percentage. The apparent density of the cement boards favorably decreased from 8.6 to 28.4% by adding different percentages of SAP. However, the microstructural modifications raised the water absorption and substantially decreased the mechanical performance. Still, adding only 0.5% of SAP reduced the bulk density by about 10% without substantially decreasing the mechanical performance of the cement boards. Therefore, the SAP was very efficient in producing lightweight cement boards by extrusion.
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