Recycled ceramic waste high strength concrete containing wollastonite particles and micro-silica: A comprehensive experimental study

Zareei, S. A ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1016/j.conbuildmat.2018.12.161
  3. Publisher: Elsevier Ltd , 2019
  4. Abstract:
  5. This study investigated the effects of combined utilization of wollastonite particles and recycled waste ceramic aggregate (RWCA) on high strength concrete (HSC) properties. Two groups of mixtures were manufactured: 1) concrete mixtures in which cement was partially replaced with wollastonite at values ranging from 10% to 50%, and 2) mixtures in which wollastonite was used at the aforementioned dosages and 50% of natural coarse aggregate was replaced with RWCA. In addition, 10% of cement weight micro-silica was added to all mixtures. The concrete behavior in terms of strength, durability, resistance against acidic environment, and performance under elevated temperatures ranging from 20 °C to 800 °C was assessed. Furthermore, the effect of wollastonite and RWCA inclusions on the microstructure of samples was studies using scanning electron microscopy (SEM). It was shown that wollastonite has an adverse impact on concrete workability and compressive strength. For example, 34% and 6% reduction in slump and 28-day compressive strength at wollastonite dosage of 50% was observed, respectively. On the other hand, the 28-day splitting tensile strength and flexural strength were respectively increased by 4.25% and 10% at 50% wollastonite content with respect to the control concrete. Furthermore, inclusions of RWCA improved the performance of concrete. For example, the 28-day compressive strength was increased by 24% in mixture with 50% wollastonite content with reference to the control concrete. In addition, the strength retention at 800 °C for mixture with RWCA was 16% higher than that of mixture without RWCA. Thus, it was concluded replacing coarse aggregate with RWCA improves the strength and durability properties of concrete and replacing 30% of cement with wollastonite particles strikes a balance between workability and strength of concrete
  6. Keywords:
  7. Acidic environment ; Elevated temperatures ; High strength concrete ; Micro-silica ; Microstructure ; Recycled waste ceramic aggregate (RWCA) ; Wollastonite particles ; Aggregates ; Cements ; Ceramic materials ; Compressive strength ; Durability ; High performance concrete ; Mixtures ; Recycling ; Scanning electron microscopy ; Silica ; Silicate minerals ; Tensile strength ; Ceramic aggregates ; Concrete workabilities ; Durability property ; Elevated temperature ; High strength concretes ; Splitting tensile strength ; Strength of concrete ; Concrete mixtures
  8. Source: Construction and Building Materials ; Volume 201 , 2019 , Pages 11-32 ; 09500618 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0950061818331519