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[69620] Artykuł:

Parameters of Alumina Cement and Portland Cement with Addition of Chalcedonite Meal

Czasopismo: IOP Conference Series: Materials Science and Engineering   Tom: 245, Zeszyt: 245, Strony: 1-7
ISSN:  1757-8981
Wydawca:  IOP PUBLISHING LTD, DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
Opublikowano: Listopad 2017
Seria wydawnicza:  IOP Conference Series-Materials Science and Engineering
Liczba arkuszy wydawniczych:  1.00
 
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Anna Kotwa orcid logo WBiAKatedra Technologii i Organizacji Budownictwa *****Niespoza "N" jednostkiInżynieria lądowa, geodezja i transport10015.00.00  

Grupa MNiSW:  Materiały z konferencji międzynarodowej (zarejestrowane w Web of Science)
Punkty MNiSW: 15
Klasyfikacja Web of Science: Proceedings Paper


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Abstract:

Aluminous cement is a quick binder with special properties. It is used primarily to
make non-standard monolithic components exposed to high temperatures, + 1300C. It is also a
component of adhesives and mortars. It has a very short setting time. It is characterized by
rapid increase in mechanical strength and resistance to aggressive sulphates. It can be used in
reinforced concrete structures. Laying of concrete, construction mortar made of alumina
cement can be carried out even at temperatures of -10°C.
This article discusses a comparison of the parameters of hardened mortar made of alumina
cement GÓRKAL 40 and Portland cement CEM I 42.5R. The mortars contain an addition of
chalcedonite meal with pozzolanic properties, with particle size of less than 0.063μm. The
meal was added in amounts of 5% and 20% of cement weight. Chalcedonite meal used in the
laboratory research is waste material, resulting from chalcedonite aggregate mining. It has the
same properties as the rock from which it originates. We have compared the parameters of
hardened mortar i.e. compressive strength, water absorption and capillarity. The addition of
20% chalcedonite meal to mortars made from aluminous cement will decrease durability by
6.1% relative to aluminous cement mortar without addition of meal. Considering the results
obtained during the absorbency tests, it can be stated that the addition of chalcedonite meal
reduces weight gains in mortars made with cement CEM I 42.5 R and alumina cement. Use of
alumina cement without addition of meal in mortars causes an increase of mass by 248%
compared to Portland cement mortars without additions, in the absorption tests. The addition of
chalcedonite meal did not cause increased weight gain in the capillary action tests. For the
alumina cement mortars, a lesser weight gains of 24.7% was reported, compared to the
Portland cement mortar after 28 days of maturing