216 International Journal of Advances in Computer Science & Its Applications – IJCSIA Volume 4: Issue 4 [ISSN 2250-3765] Publication Date : 27 December,2014 Influence of the shape of the natural aggregates, recycled and silica fume on the mechanical properties of pervious concrete Manuel J. Chinchillas-Chinchillas, Ramón Corral-Higuera, José M. Gómez-Soberón, Susana P. Arredondo-Rea, Jorge L. Alamaral-Sánchez, Octavio H. Acuña-Aguero, Carlos A. Rosas-Casarez. Abstract— Currently the problems of water quality are increasing; much of the material is rinsed and is dragged into streams, rivers, and groundwater from the contaminated superficial draining, which contains materials that are applied to the soil surface. Therefore is that the provide the greatest amount of uncontaminated water to the subsurface is of great importance, since it can still potentially solve some important collateral problems, such as the settlement in the soil, which is related largely to levels low capacity of the aquifer. Therefore, use Pervious Concrete (PCo) can help prevent physical barrier between rainwater and underground (especially in urban areas). For the investigation of the feasibility of PCo three types of aggregate were used: Round Natural Aggregate (RNA), Natural Crushed Aggregate (NCA) and Recycled Aggregate from Concrete crushed (RAC),since the shape of the aggregates generally determines the mechanical properties; and yet very little is known about their correlation with permeability. Moreover, concrete recycling is an effective way for the elimination of debris from demolition as well as replace part of the cement by waste material as the Silica Fume (SF); in both cases, these actions production decreases and CO 2 emissions associated with their production. In this work different aggregates with a substitution of SF are evaluated, for know physical and mechanical properties of pervious concrete and in part to contribute to solving the environmental problem of the construction. Keywords—Pervious concrete, silica fume, recycled aggregates. Manuel J. Chinchillas-Chinchillas, Ramón Corral-Higuera, Susana P. Arredondo-Rea , Jorge L. Alamaral-Sánchez, Octavio H. Acuña-Aguero, Carlos A. Rosas-Casarez. Universidad Autónoma de Sinaloa. México José M. Gómez-Soberón, Universidad Politécnica de Cataluña. Spain. I. Introduction A. General context The concrete permeable term describes to a material with workability between zero and a high void ratio, usually it is constituted by Portland cement, coarse aggregate, little or no fine aggregate, additives and water. The combination of these components will produce a material hardened with connected pores that go from the 2 to 8 mm, which will allow that the water should happen across them from easy form. The void content of these concretes can vary from 10 to 35%, and with resistances to simple compression of the order from 2.8 to 28 MPa. On the other hand, the drainage capacity of a concrete pavement permeable tends to vary depending on the size of aggregate and of the density of his mixture; in general they reach values between 81 to 730 L/min/m 2 [1]. Similarly, it is known that the mechanical properties of concrete depend on several important factors, such as: the water/cement ratio, the degree of compaction and its porosity; existing likewise other factors that emphasize these, such as: the shape, the size and resistance of aggregates, among others [2]. In addition, it is also known that the strength of the concrete in the so-called interfacial zone between the aggregate and the cement pasta depends on the integrity of the cement pasta and on the nature of the thick aggregate [3]. Being so, the form of the aggregate is important, since using the round aggregates in the PCo causes a decrease in mechanical properties due to the adhesion between the aggregate and the paste; for what in the crushed aggregates, on having had major adherence in the pasta of concrete [4-5] can foresee improvement in his properties. At present, the concrete at the end of his life cycle can be recycled to serve as aggregate in new concrete with new applications [6]; the previous thing contributes with advantages, since this material is not disposed of in landfills that contaminate the environment and likewise these prevent the extraction of natural aggregates that cause harm to ecosystems. It is known also that SF has properties pozzolanic (capacity of chemical reaction with calcium hydroxide in the presence of water at room temperature), and that is used as partial