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Sonda K-Nassera jako narzędzie kontroli mieszanek samozagęszczalnych

Chilmon K., Kamiński P., Woyciechowski P.

Materiały Budowlane

2016

nr 10

33--35

W artykule określono przydatność sondy K-Nassera do ustalenia klasy konsystencji mieszanki samozagęszczalnej. Urządzenie to pozwala na skrócenie i uproszczenie pomiaru w stosunku do normowej metody rozpływu stożka. Uzyskane wyniki badań pokazują, że sonda spełnia stawiane jej oczekiwania dotyczące oszacowania klasy konsystencji mieszanek samozagęszczalnych, przy czym wdrożenie tego rozwiązania na masową skalę wymagałoby dalszych badań.

This paper evaluates the usefulness of the K-Slump Tester in defining consistency class of SCC. This tool allows one to shorten and simplify measurement in relation to the standardized method of slump flow. The obtained results shows that K-Slump Tester may be used to estimate consistency class of SCC, however putting this solution into practice on a large scale still requires additional research.

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.