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Metoda badań przepływowych wentylatorów dachowych do samochodów specjalnych

Jankowski K., Zbrowski A.

Logistyka

2014

nr 6

4817-4821

W artykule przedstawiono metodę badań przepływowych dla wentylatorów nawiewno-wyciągowych stosowanych w samochodach specjalnych. Na przykładzie dwóch wentylatorów pokazano wpływ rozwiązań konstrukcyjnych na ich parametry przepływowe oraz przydatność do stosowania w samochodach.

The article presents a method of flow test dedicated for supply/exhaust fan used in special vehicles. Influence of the fan design on the flow parameters and suitability for use in cars was shown on the example of two fans.

The properties of cement concretes modified with superplasticizers

Kapelko A., Kapelko R.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

2009

z. 53 [265]

85-94

The properties of grouts, mortars and concrete mixtures with four different superplasticizers have been investigated. We determined the plasticizing and setting time of cement, the plasticizing and shrinkage of mortars, the consistency change of concrete mixtures as a function of time using the slump and flow tests, and the compressive strength and water absorption of cement concrete. The investigations carried out show the significant impact of superplasticizers on the plasticizing of cement grouts and on the shortening of their setting time. The shrinkage of mortars depends on the type of superplasticizer. Furthermore, the consistency change as a function of time depends on the type of superplasticizer and indicates the possibilities of lengthening the time of workability maintenance of mixtures with those superplasticizers. The linear relationship was found between the values of the slump loss and the slump flow as a function of time. The superplasticizers used significantly lower the water absorption of concrete and increase the quality of those concretes by 1-2 classes as compared with the concrete without admixture. The investigations into cement concrete with superplasticizer indicate the possibilities of regulation of concrete mixtures consistency and selecting the adequate mean of transportation and placing, as well as some cement savings.