Publication detail

Diatomaceous Earth-Lightweight Pozzolanic Admixtures for Repair Mortars-Complex Chemical and Physical Assessment

PAVLÍKOVÁ, M. ROVNANÍKOVÁ, P. ZÁLESKÁ, M. PAVLÍK, Z.

Original Title

Diatomaceous Earth-Lightweight Pozzolanic Admixtures for Repair Mortars-Complex Chemical and Physical Assessment

Type

journal article in Web of Science

Language

English

Original Abstract

The presented research is focused on the complex assessment of three different types of diatomaceous earth and evaluation of their ability for application as pozzolana active admixtures applicable in the concrete industry and the production of repair mortars applicable for historical masonry. The comprehensive experimental campaign comprised chemical, mineralogical, microstructural, and physical testing of raw materials, followed by the analyses and characterization of pozzolanic activity, rheology and heat evolution of fresh blended pastes, and testing of macrostructural and mechanical parameters of the hardened 28-days and 90-days samples. The obtained results gave evidence of the different behavior of researched diatomaceous earth when mixed with water and Portland cement. The differences in heat evolution, initial and final setting time, porosity, density, and mechanical parameters were identified based on chemical and phase composition, particle size, specific surface, and morphology of diatomaceous particles. Nevertheless, the researched mineral admixtures yielded a high strength activity index (92.9% to 113.6%), evinced their pozzolanic activity. Three fundamental factors were identified that affect diatomaceous earth's contribution to the mechanical strength of cement blends. These are the filler effect, the pertinent acceleration of OPC hydration, and the pozzolanic reaction of diatomite with Portland cement hydrates. The optimum replacement level of ordinary Portland cement by diatomaceous earth to give maximum long-term strength enhancement is about 10 wt.%., but it might be further enhanced based on the properties of pozzolan.

Keywords

diatomaceous earth; pozzolanic activity; Portland cement substitution; heat release; rheology; strength activity index; improvement of mechanical parameters

Authors

PAVLÍKOVÁ, M.; ROVNANÍKOVÁ, P.; ZÁLESKÁ, M.; PAVLÍK, Z.

Released

3. 10. 2022

Publisher

MDPI

Location

BASEL

ISBN

1996-1944

Periodical

Materials

Year of study

15

Number

19

State

Swiss Confederation

Pages from

1

Pages to

21

Pages count

21

URL

https://www.mdpi.com/1996-1944/15/19/6881

BibTex

@article{BUT182457,
  author="Milena {Pavlíková} and Pavla {Rovnaníková} and Martina {Záleská} and Zbyšek {Pavlík}",
  title="Diatomaceous Earth-Lightweight Pozzolanic Admixtures for Repair Mortars-Complex Chemical and Physical Assessment",
  journal="Materials",
  year="2022",
  volume="15",
  number="19",
  pages="1--21",
  doi="10.3390/ma15196881",
  issn="1996-1944",
  url="https://www.mdpi.com/1996-1944/15/19/6881"
}