Durability of Cementitious Composites Mixed with Various Portland Limestone Cement-Cements

2017 ◽  
Vol 114 (5) ◽  
Author(s):  
Aidi Marzouki ◽  
André Lecomte
Keyword(s):  
Cementitious Composites ◽  
Portland Limestone Cement ◽  
Limestone Cement

scholarly journals Inventive Microstructural and Durability Investigation of Cementitious Composites Involving Crystalline Waterproofing Admixtures and Portland Limestone Cement

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1425 ◽  
Author(s):  
Pejman Azarsa ◽  
Rishi Gupta ◽  
Alireza Biparva
Keyword(s):  
Chemical Elements ◽  
Cementitious Composites ◽  
Chemical Compositions ◽  
Crystal Formation ◽  
Polished Section ◽  
Limited Information ◽  
Sem Images ◽  
X Ray ◽  
Portland Limestone Cement ◽  
Limestone Cement

The durability of a cement-based material is mainly dependent on its permeability. Modifications of porosity, pore-structure and pore-connectivity could have significant impacts on permeability improvement, which eventually leads to more durable materials. One of the most efficient solutions in this regard is to use permeability reducing admixtures (PRA). Among these admixtures for those structures exposed to hydro-static pressure, crystalline waterproofing admixtures (CWA) have been serving in the construction industries for decades and according to ACI 212—chemical admixtures’ report, it has proven its capability in permeability reduction and durability-enhancement. However, there is substantial research being done on its durability properties at the macro level but very limited information available regarding its microstructural features and chemical characteristics at the micro level. Hence, this paper presents one of the first reported attempts to characterize microstructural and chemical elements of hydration products for cementitious composites with CWA called K, P and X using Scanning Electron Microscopy (SEM). Backscattered SEM images taken from a polished-section of one CWA type—K—admixture were analyzed in ImageJ to obtain paste matrix porosity, indicating a lower value for the CWA-K mixture. X-ray analysis and SEM micrographs of polished sections were examined to identify chemical compositions based on atomic ratio plots and brightness differences in backscatter-SEM images. To detect chemical elements and the nature of formed crystals, the fractured surfaces of three different CWA mixtures were examined. Cementitious composites with K admixture indicated needle-like crystal formation—though different from ettringite; X and P admixtures showed sulfur peaks in Energy Dispersive Spectrum (EDS) spectra, like ettringite. SEM images and X-ray analyses of mixtures incorporating Portland Limestone Cement (PLC) indicated lower-than-average porosity but showed different Si/Ca and Al/Ca atomic ratios.

scholarly journals Mechanical and Durability Properties of Portland Limestone Cement (PLC) Incorporated with Nano Calcium Carbonate (CaCO3)

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 905 ◽  
Author(s):  
Lochana Poudyal ◽  
Kushal Adhikari ◽  
Moon Won
Keyword(s):  
Calcium Carbonate ◽  
Environmental Sustainability ◽  
Green Infrastructure ◽  
Durability Properties ◽  
Portland Limestone Cement ◽  
Global Environmental ◽  
Depth Study ◽  
Series Of Experiments ◽  
Limestone Cement ◽  
New Generation

Despite lower environmental impacts, the use of Portland Limestone Cement (PLC) concrete has been limited due to its reduced later age strength and compromised durability properties. This research evaluates the effects of nano calcium carbonate (CaCO3) on the performance of PLC concrete. The study follows a series of experiments on the fresh, hardened, and durability properties of PLC concrete with different replacement rates of nano CaCO3. Incorporation of 1% nano CaCO3 into PLC concrete provided the optimal performance, where the 56 days compressive strength was increased by approximately 7%, and the permeability was reduced by approximately 13% as compared to Ordinary Portland Cement (OPC) concrete. Further, improvements were observed in other durability aspects such as Alkali-Silica Reaction (ASR) and scaling resistance. Additionally, nano CaCO3 has the potential to be produced within the cement plant while utilizing the CO2 emissions from the cement industries. The integration of nanotechnology in PLC concrete thus will help produce a more environment-friendly concrete with enhanced performance. More in-depth study on commercial production of nano CaCO3 thus has the potential to offer a new generation cement—sustainable, economical, and durable cement—leading towards green infrastructure and global environmental sustainability.

Durability performance of Portland limestone cement mortar containing butyl and zinc stearate admixtures

2021 ◽  
Vol 54 (2) ◽  
Author(s):  
Athanasios Malakopoulos ◽  
Manolis Chatzigeorgiou ◽  
Nikos Boukos ◽  
Athanasios Salifoglou
Keyword(s):  
Cement Mortar ◽  
Zinc Stearate ◽  
Portland Limestone Cement ◽  
Limestone Cement ◽  
Durability Performance

Effects of fly ash on Portland limestone cement under sulfate attack at low temperature

2020 ◽  
Vol 72 (3) ◽  
pp. 134-148 ◽  
Author(s):  
Meng Wu ◽  
Yunsheng Zhang ◽  
Yongsheng Ji ◽  
Guojian Liu ◽  
Wei She ◽  
...  
Keyword(s):  
Fly Ash ◽  
Low Temperature ◽  
Sulfate Attack ◽  
Portland Limestone Cement ◽  
Limestone Cement
Sign in / Sign up

Export Citation Format

Share Document