The development of the civil construction industry generates major problems, such as the production of construction waste. This complication is aggravated mainly in municipalities where there is no management and disposal policy, as it is the case of Sinop, Mato Grosso (MT), Brazil. A possible solution to this environmental problem in that municipality is the application of ground waste to sand fraction as stabilizer in order to increase resistance of the regional subgrade. The latter is characterized as having a low-bearing soil capacity. Furthermore, this strategy may allow for soothing of other problems, such as granular material extraction from the environment. This paper sought answers to improve the low-bearing soil capacity in Sinop, which was granulometrically and mechanically stabilized by having natural soil mixed with two percentages of construction waste: 25% and 50%, with two compaction energies: normal and intermediate. Samples were subjected to tests for characterization and resistence. Results show relevant improvement in handling material characteristics. Natural soil, characterized as A-4 TRB, from bad to poor subgrade performance, and 12.2% CBR, with blend in three CBR cases as well as expansion, conformed to be sub-base material (CBR > 20%). Additionally, in one of the cases, it conformed to be base material (CBR > 60%). However, even though material with good resistance and bearing capacity was obtained, it was not possible to reach conclusions on its technical feasibility due to grain size not fitting ABNT NBR 15115 specification.

A presente pesquisa buscou investigar, por meio de um modelo de regressão logístico, como determinados fatores podem contribuir para a ocorrência de acidentes fatais em rodovias federais do estado de Santa Catarina - Brasil. Para tal, foram utilizados dados públicos da Polícia Rodoviária Federal sobre acidentes ocorridos no período de 2007 a 2018. O modelo logístico final permitiu estabelecer a razão de chances das principais categorias dentro das variáveis condição meteorológica, fases do dia, causas do acidente, tipo de acidente e traçado da via. Fatores como colisão frontal, atropelamento, amanhecer, causa viária/ambiental e condições ensolaradas foram os mais representativos nesse contexto. Elementos associados à falta de canteiros centrais e passarelas para pedestres, baixa visibilidade durante a condução e fadiga ao volante foram grandes contribuintes para o aumento da gravidade das colisões. As maiores razões de chances para os fatores viário/ambiental e condição ensolarada foram considerados resultados inesperados, indo de encontro à premissa de que o fator humano e condições de pista molhada contribuem mais significativamente para a ocorrência de óbitos. A falta de informações sobre a condição da pista no momento do acidente, o volume de tráfego das rodovias e o tipo de veículo foram fatores limitantes para o estudo.

Estudo comparativo de orçamentos utilizando os métodos paramétrico e analítico no município de Sinop/MT Comparative study of budgets using parametric and analytical methods in Sinop City (Brazil)

The combination of hot weather typical factors, such as high temperature and low relative humidity of the air, associated with the delay in concrete application due to lack of planning in concreting, are some causes of slump loss in this material. Depending on the type of work and the adopted execution methods, this loss may make both placement and compaction more difficult. Thus, consistency correction through water addition or other plasticizer additives are common. In this context, this research aimed to analyze the variations of slump loss in concrete through time and the consequences of water addition in the mixture. Therefore, it was performed a study with trace of characteristic resistance to compression correspondent to 35 MPa, analyzing 70 test specimens in a total of seven subsequent periods, from 0 min (after preparation) and 180 min. The specimens were molded according to ABNT NBR 5738 (2015) Brazilian standard and submitted to compression test after 28 days being cured, according to ABNT NBR 5739 (2018) Brazilian standard. Results showed that after 180 min, water addition caused a 68,60% increase in water to cement ratio and a 59,20% loss of resistance to compression. In summary, water addition to slump correction was observed to be an extremely harmful practice to concrete and it should be avoided or minimized.