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Title: Internal curing with lightweight aggregate produced from biomass-derived waste

Shrinkage of concrete may lead to cracking and ultimately to a reduction of the service life of concrete structures. Among known methods for shrinkage mitigation, internal curing with porous aggregates was successfully utilized in the last couple of decades for decreasing autogenous and drying shrinkage. In this paper, the internal curing performance of pre-saturated lightweight aggregates produced from biomass-derived waste (bio-LWA) was studied. In the first part of this paper, the microstructure of the bio-LWA is investigated, with special focus on their pore structure and on their water absorption and desorption behavior. The bio-LWA has large porosity and coarse pore structure, which allows them to release the entrained water at early age and counteract self-desiccation and autogenous shrinkage. In the second part, the efficiency of internal curing in mortars incorporating the bio-LWA is examined by neutron tomography, internal relative humidity and autogenous deformation measurements.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [5]
  1. Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf (Switzerland)
  2. (IfB), ETH Zürich (Switzerland)
  3. (Poland)
  4. Siam Research and Innovation, SCG Cement–Building Materials, Saraburi (Thailand)
  5. Paul Scherrer Institut, 5232 Villigen PSI (Switzerland)
Publication Date:
OSTI Identifier:
22323135
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 59; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION; CRACKING; DEFORMATION; DESORPTION; EFFICIENCY; FLY ASH; NEUTRONS; PORE STRUCTURE; POROSITY; SHRINKAGE; WATER