The manufacture of concrete using a polymer instead of a stony coarse aggregate known as gravel is presented. Polyethylene terephthalate (PET) is the polymer used, recycling soft drink containers with sufficient tenacity. PET is a material commonly used by engineers as a structural element, not as an aggregate. The research work revealed that PET aggregate produces good quality mixtures with lower volumetric weight but mechanical behavior similar to that of natural concrete with adequate granulometry. The water/cement (W/C) ratio is lower for light concretes than for natural concrete. Regarding stress and Flexural strength, it was found that for 300？kg/cm3 and higher cement consumption, which may be due to the fact that at low W/C ratios, the coarse aggregate behavior prevails, while at high W/C ratios, the paste behavior prevails. This leads us to the fact that PET aggregate is best applied on low cement consumption up to 300？kg/m3, since expensive mixtures for higher consumption may result from use on higher consumption. Modulus of elasticity for light concretes is lower than for natural concretes. Deformations are lower for light concretes than for natural concretes. A feature of using PET to substitute coarse aggregate is volumetric weight, since it is 68.88% lighter than concrete with natural aggregates. 1. Introduction Throughout history, plastics may have been considered a major technical breakthrough in the XX Century, mainly due to the fact that they have preceded new inventions and have substituted other materials in already existing products. They are light, durable, and versatile, as well as resistant to humidity, chemical products, and degradation. However, such properties constitute a challenge for solid and dangerous waste agents. Plastics recycling around the world has increased considerably due to the need to solve the problem of accumulation of solid urban waste, which has promoted developing alternative recycling systems and assessing the value of waste, particularly nonreturnable containers. By means of the combined use of concrete and polyethylene terephthalate (PET) in building, a technology scarcely studied in Mexico is being projected. There exists research leading us to consider PET as an aggregate and not as substitute in the mixture [1]. International research regarding the use of PET as an aggregate already shows some progress worth considering. There exists a research on the surface microstructure of PET waste from plastic bottles used as a lightweight aggregate to examine the effect of granulated blast-furnace slag [2]. PET
References
[1]
L. Alesmar, N. Rendón, and M. E. Korody, “Dise？os de mezcla de tereftalato de polietileno (PET)-Cemento,” Revista de la Facultad de Ingeniería de la U.C.V, vol. 23, no. 1, pp. 77–86.
[2]
Y. W. Choi, D. J. Moon, J. S. Chung, and S. K. Cho, “Effects of waste PET bottles aggregate on the properties of concrete,” Cement and Concrete Research, vol. 35, no. 4, pp. 776–781, 2005.
[3]
O. Y. Marzouk, R. M. Dheilly, and M. Queneudec, “Valorization of post-consumer waste plastic in cementitious concrete composites,” Waste Management, vol. 27, no. 2, pp. 310–318, 2007.
[4]
F. Mahdi, H. Abbas, and A. A. Khan, “Strength characteristic of polymer mortar and concrete using different compositions of resins derived from post-consumer PET bottles,” Construction and Building Materials, vol. 24, no. 1, pp. 25–36, 2010.
[5]
C. Albano, N. Camacho, M. Hernández, A. Matheus, and A. Gutiérrez, “Influence of content and particle size of waste pet bottles on concrete behavior at different w/c ratios,” Waste Management, vol. 29, no. 10, pp. 2707–2716, 2009.
[6]
F. Mahdi, H. Abbas, and A. A. Khan, “Strength characteristics of polymer mortar and concrete using different compositions of resins derived from post-consumer PET bottles,” Construction and Building Materials, vol. 24, no. 1, pp. 25–36, 2010.
[7]
M. Frigione, “Recycling of PET bottles as fine aggregate in concrete,” Waste Management, vol. 30, no. 6, pp. 1101–1106, 2010.
[8]
S. Ak？a？zo？lu, C. D. Ati？, and K. Ak？a？zo？lu, “An investigation on the use of shredded waste PET bottles as aggregate in lightweight concrete,” Waste Management, vol. 30, no. 2, pp. 285–290, 2010.
C. Cortinas de Nava and S. Vega Gleason, Residuos Peligrosos en el Mundo y en México, Serie Monografías, no. 3, SEDESOL, Instituto Nacional de Ecología, Coyoacán, Mexico, 1993.
[11]
J. A. Carega, Manejo y Reciclaje de los Residuos de Envases y Embalajes, Serie Monografías, no. 4, SEDESOL, Instituto Nacional de Ecología, Coyoacán, Mexico, 1993.
[12]
ASTM C-33-90, Standard specification for concrete aggregates, 1990.
[13]
ASTM C-125-07, Standard terminology relating to concrete and concrete aggregates, 2007.
[14]
Norme AFNOR P-18301 and AFNOR GROUP, Opérateur national et international au service de la performance et du développement durable des entreprises et de la société civile, France, 2008.
[15]
ASTM C-566-89, Standard method for total moisture content of aggregate by drying, 1989.
[16]
ASTM C-127-88, Standard test method for specific gravity and absorption of coarse aggregate, 1988.
[17]
ASTM C-128-88, Standard test method for specific gravity and absorption of fine aggregate, 1988.
[18]
S. H. Kosmatka and W. C. Panarese, Dise？o y control de mezclas de concreto, IMCyC, Mexico City, Mexico, 1992.
[19]
ACI-211.1-89, Standard practice for selecting proportions normal, heavy weight, and mass concrete, 1989.
[20]
CEMEX Unidad concreto Cemex, Biblioteca del CIDETEC, Cemex, Mexico City, Mexico, 1996.
[21]
ASTM C-94-90, Standard specification ready mixed concrete, 1990.
[22]
Instructivo para efectuar pruebas en agregados y concreto hidráulico, vol. 3, Secretaría de Asentamientos Humanos y Obras Públicas, Mexico, 1991.
[23]
ASTM C-138-81, Standard test method for unit weigth, yeild, and air content (gravimetric) of concrete, 1981.
[24]
ASTM C-231-91, Standard test method for air content fleshly mixed concrete by the pressure method, 1991.
[25]
ASTM C-39, Standard test method for compressive strength of cylindrical concrete specimens, 1990.
[26]
ASTM C-496-90, Standard test method for splitting tensile strength of concrete specimens, 1990.
[27]
ASTM C-78-84, Standard test method for flexural strength of concrete (using simple beam with third point loading), 1984.
[28]
ASTM C-469-87a, Standard test method for static modulus of elasticity and poisson's ratio of concrete in compression, 1987.
[29]
F. Casanova-del-Angel, Análisis Multidimensional de Datos, Logiciels, Mexico, 2001.
