The high performance concrete is a relatively recent material and its use dates of final of the 60’s. However, countless advantages make it to be used more and more in the construction. Its manufacturing comes from the standard concrete to which a series of additives as microsílica or cementitious are added. These additives confer the concrete some better benefits regarding the standard concrete as an increase of the near resistance up to 100%. The mechanical properties of this concrete newly are being studied in detail and at the moment there are not many studies about the influence of the additives in the resistance, formulation optimizations or the evolution of the resistance to compression with the time of curing. Over all the mechanical properties of the concrete, the resistance to compression after 28 days of curing is the most used one in control of quality. In this study the i...

Small and medium-sized enterprises (SME) are the driving force of economic expansion and employment creation in any country. Therefore, it is critical to promote the creation of new SMEs and maximize their chances of survival, especially in the first three critical years of their lives. Recognizing this, governments often 54 develop and implement diverse policies aimed at boosting entrepreneurship and supporting the creation of business initiatives, particularly those that helping SMEs in the early stages of life From a sponsor’s (e.g. the government or private business incubators) standpoint, it is important to understand the probability of survival that of new companies. Developing a model that attempts to explain the success or failure in a company from a quantitative and qualitative perspective is a research area to which significant resources have been devoted in recent times. Suc...