Use of a 3D Structured-Light Scanner to Determine Volume, Surface Area, and Shape of Aggregates

Autor(es)

Loz, Paulo H. F. ^[1] ; Angulo, Sergio C. ^[2] ; Rebmann, Markus S. ^[2] ; Tutumluer, Erol ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Escola Politecn, Dept Civil Engn, Ave Prof Almeida Prado, Travessa 2, 83, BR-05508070 Sao Paulo, SP - Brazil

^[2] Univ Sao Paulo, Escola Politecn, Ave Prof Almeida Prado, Travessa 2, 83, BR-05508070 Sao Paulo, SP - Brazil

^[3] Univ Illinois, Dept Civil & Environm Engn, 205 N Mathews, Urbana, IL 61801 - USA

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF MATERIALS IN CIVIL ENGINEERING; v. 33, n. 9 SEP 1 2021.
• Citações Web of Science: 0

Resumo

The standard method of using a caliper to determine aggregate particle dimensions is not sufficient to describe the shape, texture, angularity, and volume of particles, and there is not a reference method to determine aggregate surface area. A three-dimensional (3D) structured-light scanner seems to be a viable and economical alternative with enough speed to obtain 3D data from hundreds of particles. This work used a 3D scanner to evaluate morphological properties of coarse aggregates and compared results with those from conventional techniques. Two types of aggregates (around 60 particles of each type) were scanned and manually measured by a single operator with a digital caliper using two different methodologies: (1) the minimum bounding box (MBB), and (2) a conventional standard test method (STD). The 3D structured-light scanner proved to be accurate for assessing the morphology, surface area, and volume of coarse aggregates, and with a processing rate of 10 min/particle, it was faster than other techniques such as X-ray computed microtomography (micro-CT) or laser scanning. Compared with the manual method (caliper) or the most commonly used two-dimensional (2D) image analysis techniques, it also was more accurate. The MBB using a caliper overestimated volume by about 17% and underestimated surface area by 11%, which was estimated by assuming an ellipsoid with the dimensions obtained. The 2D circularity had a poor correlation with the 3D sphericity, especially for flat or elongated particles. (C) 2021 American Society of Civil Engineers. (AU)

• Processo FAPESP: 16/20420-2 - Resistência dos Agregados: controle e análise de efeitos no comportamento mecânico dos concretos
• Beneficiário: Sérgio Cirelli Angulo
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 14/50948-3 - INCT 2014: tecnologias ecoeficientes avançadas em produtos cimentícios
• Beneficiário: Vanderley Moacyr John
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 17/25826-0 - Avaliação da rugosidade dos agregados graúdos naturais e sua influência na formação de macrodefeitos na interface pasta-agregado
• Beneficiário: Paulo Henrique Ferreira Loz
• Modalidade de apoio: Bolsas no Brasil - Mestrado