Pregled bibliografske jedinice broj: 1203031
The effect of pore microstructure on strength and chloride ingress in blended cement based on low kaolin clay
The effect of pore microstructure on strength and chloride ingress in blended cement based on low kaolin clay // Case studies in construction materials, 17 (2022), 1-17 doi:10.1016/j.cscm.2022.e01242 (međunarodna recenzija, članak, znanstveni)
CROSBI ID: 1203031 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
The effect of pore microstructure on strength and
chloride ingress in blended cement based on low
kaolin clay
Autori
Ram, Kiran ; Serdar, Marijana ; Londono-Zulua, Diana ; Scrivener, Karen
Izvornik
Case studies in construction materials (2214-5095) 17
(2022);
1-17
Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni
Ključne riječi
Limestone calcined clay cement, MIP, Surface resistivity, Sorptivity indices, Chloride migration coefficient, Chloride diffusion coefficient
Sažetak
The objective of this study is to analyse the mechanical and durability properties of a high- performance mortars based on low grade kaolin clay and the effect of electrical conductivity and pore microstructure on the chloride penetration resistance. A total of six mixes were prepared with binary and ternary binders in which a high volume of cement was replaced by low-grade calcined kaolin clay, fly ash and limestone powder. The percentage of kaolinite in the clay used from the Southeast European region was less than 20%. The variations in compressive strength and chloride transport coefficient were analysed experimentally and related to the pore structure and electrical conductivity. Compressive strength, chloride migration and diffusion coefficients, and bulk conductivity were determined using mortar samples, while the pore size distribution was determined by mercury intrusion porosimetry (MIP) on hardened cement paste after 7, 28, and 90 days of curing. To understand the capillary absorption of these mixtures, sorptivity indices were measured after 28 and 90 days. The experimental characteristics of the pore size distribution, such as mean pore entry radius (r 0.5), permeable porosity (P), capillary porosity (ɸ), and critical pore diameter (rc), were calculated using the cumulative data of the intruded volume as a function of pressure obtained by MIP. In addition, the extrusion-intrusion curve was used to calculate the pore entrapment fraction (α) and the degree of inter-connectivity of the pore structure. The evolution of pore structure parameters was monitored for up to 90 days and their effects on strength and chloride penetration were studied in detail. The results showed that all mixes (even those with low kaolinite content) can be used in high performance cement systems and the pore structure has a limited effect on chloride penetration.
Izvorni jezik
Engleski
Znanstvena područja
Građevinarstvo, Temeljne tehničke znanosti
POVEZANOST RADA
Projekti:
--IZHRZO 180590i1 - Advanced low CO2 cementitious materials (ACT) (Serdar, Marijana) ( CroRIS)
--UIP-2017-05-4767 - Alternativna veziva za beton: razumijevanje mikrostrukture za predviđanje trajnosti (ABC) (Serdar, Marijana) ( CroRIS)
Ustanove:
Građevinski fakultet, Zagreb
Citiraj ovu publikaciju:
Časopis indeksira:
- Current Contents Connect (CCC)
- Web of Science Core Collection (WoSCC)
- Science Citation Index Expanded (SCI-EXP)
- SCI-EXP, SSCI i/ili A&HCI
- Scopus
