Introduction of a mineral powder as a type of natural cementitious material in concrete: An experimental program

In this study, the effects on high performance mortar (HPM) of synthetic wollastonite (SW) mineral were researched. Through this work, firstly, wollastonite was synthetically obtained by a particular production method. Secondly, SW was utilized as cement replacement material from 0 to 12% by 3% steps of increment in the production of HPM. After determination of slump flow diameters of HPMs, mechanical and durability properties were observed at 28 and 90 days. Additionally, microstructural performance properties of HPMs designed with SW in the ratios 0, 9, and 12% was specified with TGA/DTA and FTIR analysis as well as SEM/EDX and XRD analysis. The test and analysis results showed that SW decreased the workability of HPMs. The improvement of the mechanical and durability properties of HPMs proceeded up to 9% of SW. Microstructural analysis showed that development effect of SW on the HPM can be attributed to its needle‐shaped structure.

Section: Introductionmentioning

confidence: 99%

The effects of synthetic wollastonite developed with calcite and quartz on high performance mortars

Öz

Güneş

2020

“…As a result, the construction industry has been prescribed to take on alternative sustainable raw materials to meet the demand. Agricultural and industrial wastes are generally used in blended cement concrete 1,2 . Bagasse ash (BA) is a by‐product of sugar mills.…”

Section: Introductionmentioning

confidence: 99%

Sustainable use of sugarcane bagasse ash and marble slurry dust in crusher sand based concrete

Murugesan¹,

Vidjeapriya

Bahurudeen

2020

Production of ordinary Portland cement is consuming enormous energy and releases high carbon dioxide. Additionally, the use of river sand as fine aggregate has a direct effect on the erosion of river banks due to excess sand mining and hence, the use of river sand in concrete is banned in many developing countries. Hence, the assessment of concrete with blended cement and locally available alternative fine aggregates is the need for current construction practices. India becomes the ‐largest sugar producing country, a massive volume of bagasse ash (44,200 t/day) is discarded as waste. Similarly, marble processing plants dispose of marble slurry dust. An exploration of the use of agricultural and mining wastes in crusher sand‐based concrete is not yet reported. The current investigation focuses on the potential use of bagasse ash and marble slurry dust as pozzolan and alternative to crusher sand respectively in concrete and interlocking paver blocks. Compressive strength and capability against abrasion were investigated for bagasse ash and marble slurry dust blended concrete and paver block. Besides, water‐based tests were adopted to examine durability performance. Results from the study indicate an enhancement in abrasion resistance and a substantial reduction in permeability for blended concrete than control concrete. Optimum replacement levels were found to be 20% for bagasse ash and 25% for marble mining powder.

Investigation of mechanical and thermal properties of nano SiO₂/hydrophobic silica aerogel co‐doped concrete with thermal insulation properties

Zaidi

Demirel

Atiş

et al. 2019

Lightweight concretes with thermal insulation properties and good compressive strength can be produced by the replacement of normal aggregate of cement mixture with low‐density materials. In this study, sand in a cement mixture has been replaced totally with silica aerogel powder as well as replacement of cement with fly ash. Furthermore, nano silica and silica‐fume were added and incorporated into the concrete matrix. The most obvious finding to emerge from this study was that a lighter sample with no sand contributed to the lowest thermal insulation reduction by 58% of the reference sample and reduction in density to 22.8%, with reduced compressive strength of 27.11 MPa at 28 days. Obtaining of a lighter concrete by using aerogel, a chance of reduced building cooling and heating energy consumption and enhanced indoor comfort with the reduction of mold and condensation on buildings wall was obtained.