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标题:The influence of the initial moisture content of lightweight aggregate on internal curing
时间:2020-02-14 23:27:03
DOI:10.1016/j.conbuildmat.2012.02.074
作者:Michael Golias; Javier Castro; Jason Weiss
关键词:Practical, Experimental/ absorption; aggregates (materials); compressive strength; concrete; cracks; curing; mixtures; permeability; shrinkage; solvation/ initial moisture content; lightweight aggregate; internal curing; internally cured concrete manufacturing; LWA; oven-dry condition; mixture; hydration; compressive strength; water absorption reduction; electrical conductivity reduction; permeability; autogenous shrinkage reduction; early-age cracking/ E3634 Cement and concrete industry E1710 Engineering materials E1525 Industrial processes E2180B Plasticity (mechanical engineering) E2180E Fracture mechanics and hardness (mechanical engineering)
出版源: 《Construction & Building Materials》 ,35 (none) :52-62
摘要:This paper explores the potential for manufacturing internally cured concretes with lightweight aggregate (LWA) that has different initial moisture contents prior to mixing: oven-dry, 24h pre-wetted, and vacuum saturated. Results show that when LWA is used in an oven-dry condition it can absorb water from the paste prior to set which will be returned to the system as internal curing water. When mixture proportion adjustments are properly made to account for the water absorbed by the aggregate before setting, the mixture can provide internal curing benefits. These beneficial aspects include increased hydration which leads to higher compressive strength, reduced water absorption, and reduced electrical conductivity (permeability). Further, these benefits include reduced autogenous shrinkage and a lower propensity for early-age cracking. [All rights reserved Elsevier].
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目录:
  • The influence of the initial moisture content of lightweight aggregate on internal curing
    • 1 Introduction
      • 1.1 Internal curing and the importance of initial aggregate moisture
      • 1.2 Movement of IC water between LWA and paste
    • 2 Materials
      • 2.1 Mixture proportioning
      • 2.2 Mixing procedure
    • 3 Experimental methods
      • 3.1 Determination of absorption behavior of LWA when mixed oven-dry
      • 3.2 Degree of hydration by isothermal calorimetry
      • 3.3 Determination of compressive strength
      • 3.4 Internal relative humidity measurement
      • 3.5 Autogenous shrinkage measurement
      • 3.6 Water sorptivity measurement
      • 3.7 LWA desorption behavior/LWA water-filled porosity
    • 4 Experimental results
      • 4.1 Internal curing provided by LWA batched oven-dry
      • 4.2 Mortars with 100% chemical shrinkage IC with varying volumes of LWA
      • 4.3 Mortars with 55% chemical shrinkage IC with varying volumes of LWA
      • 4.4 Mortars with 15% LWA, varying amounts of IC
      • 4.5 Mortars with 28% LWA, varying amounts of IC
    • 5 Discussion
    • 6 Conclusions
    • References

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