Accelerated Testing Method

14,000,000 Leading Edge Experts on the ideXlab platform

Scan Science and Technology

Contact Leading Edge Experts & Companies

Scan Science and Technology

Contact Leading Edge Experts & Companies

The Experts below are selected from a list of 6183 Experts worldwide ranked by ideXlab platform

C C Yang - One of the best experts on this subject based on the ideXlab platform.

  • effects of carbonation on mechanical properties and durability of concrete using Accelerated Testing Method
    Journal of Marine Science and Technology, 2002
    Co-Authors: Ran Huang, C C Yang
    Abstract:

    An experimental investigation was carried out to study the effect of carbonation on mechanical properties and durability of concrete. Ordinary portland concretes (OPC) with water/cement ratios of 0.58 and 0.48 and self-compacting concretes (SCC) with water/binder ratios of 0.40 and 0.36 were used in this study. Compressive strength test, splitting strength test, electrical resistivity test, rapid chloride penetration test (RCPT), open circuit potential Method and alternative current (AC) impedance Method were performed to estimate the properties of concrete. Test results showed that carbonation may compensate some concrete properties such as compressive strength, splitting strength, electrical resistivity and chloride ion penetration. However, corrosion test results showed that carbonation increases corrosion rate of reinforcing steel.

César Del Olmo - One of the best experts on this subject based on the ideXlab platform.

  • Carbonation resistance of one industrial mortar used as a concrete coating
    Building and Environment, 2001
    Co-Authors: Miguel A. Sanjuan, César Del Olmo
    Abstract:

    Abstract In aggressive environments, concrete itself may not be enough to protect the reinforcement against carbon dioxide penetration. This gas reacts with the portlandite of the concrete to form calcium carbonate. This process leads to a pH reduction and, therefore, promotes the depassivation of the steel reinforcement in reinforced concretes. Therefore, a supplementary protection Method such as coating with a mortar, as carbonation barrier can be used to provide adequate durability. Experimental data are presented to illustrate the effect of three different Testing levels of CO 2 on an industrial mortar applied to a concrete base in order to evaluate its performance as an anti-carbonation barrier. The results from the coated concrete are compared with the carbonation resistance of the uncoated plain concrete. The carbonation depth was determined using a phenolphthalein pH-indicator. A clear reduction in carbonation was observed when the mortar was applied. The validity of the Accelerated Testing Method, which consists of placing the mortar in a high carbon dioxide concentration chamber for a controlled time, and carbonation coefficients to assess coating effectiveness are discussed. The use of 100% carbon dioxide is highly questionable for Accelerated carbonation Testing.

Ran Huang - One of the best experts on this subject based on the ideXlab platform.

  • effects of carbonation on mechanical properties and durability of concrete using Accelerated Testing Method
    Journal of Marine Science and Technology, 2002
    Co-Authors: Ran Huang, C C Yang
    Abstract:

    An experimental investigation was carried out to study the effect of carbonation on mechanical properties and durability of concrete. Ordinary portland concretes (OPC) with water/cement ratios of 0.58 and 0.48 and self-compacting concretes (SCC) with water/binder ratios of 0.40 and 0.36 were used in this study. Compressive strength test, splitting strength test, electrical resistivity test, rapid chloride penetration test (RCPT), open circuit potential Method and alternative current (AC) impedance Method were performed to estimate the properties of concrete. Test results showed that carbonation may compensate some concrete properties such as compressive strength, splitting strength, electrical resistivity and chloride ion penetration. However, corrosion test results showed that carbonation increases corrosion rate of reinforcing steel.

Takenobu Sakai - One of the best experts on this subject based on the ideXlab platform.

  • Accelerated creep and creep rupture Testing of transverse unidirectional carbon epoxy lamina based on the stepped isostress Method
    Composite Structures, 2017
    Co-Authors: Jonatho D Tanks, Katherine Rade, Stephe R Sharp, Takenobu Sakai
    Abstract:

    Abstract Accelerated Methods for measuring long-term viscoelastic properties of fiber reinforced polymer (FRP) composites are important for reducing the time needed to characterize material behavior. Most of them are based on the time-temperature-stress superposition principle (TTSSP), or some variation. This paper investigates the applicability of the stepped isostress Method (SSM) to study tensile creep of unidirectional carbon FRP (CFRP) lamina used in rehabilitating prestressed concrete structures. The SSM employs a load-stepping approach, typically with three to five steps for a single specimen resulting in creep-rupture. Theoretical analysis of the experimental Method (previously lacking) is discussed and modifications to the Testing and analysis protocol are shown to improve validity of the master curves compared to conventional creep curves and traditional TTSSP creep master curves at room temperature. Finally, three failure criteria are compared for predicting creep-rupture of CFRP laminates based on the Accelerated Testing Method.

Miguel A. Sanjuan - One of the best experts on this subject based on the ideXlab platform.

  • Carbonation resistance of one industrial mortar used as a concrete coating
    Building and Environment, 2001
    Co-Authors: Miguel A. Sanjuan, César Del Olmo
    Abstract:

    Abstract In aggressive environments, concrete itself may not be enough to protect the reinforcement against carbon dioxide penetration. This gas reacts with the portlandite of the concrete to form calcium carbonate. This process leads to a pH reduction and, therefore, promotes the depassivation of the steel reinforcement in reinforced concretes. Therefore, a supplementary protection Method such as coating with a mortar, as carbonation barrier can be used to provide adequate durability. Experimental data are presented to illustrate the effect of three different Testing levels of CO 2 on an industrial mortar applied to a concrete base in order to evaluate its performance as an anti-carbonation barrier. The results from the coated concrete are compared with the carbonation resistance of the uncoated plain concrete. The carbonation depth was determined using a phenolphthalein pH-indicator. A clear reduction in carbonation was observed when the mortar was applied. The validity of the Accelerated Testing Method, which consists of placing the mortar in a high carbon dioxide concentration chamber for a controlled time, and carbonation coefficients to assess coating effectiveness are discussed. The use of 100% carbon dioxide is highly questionable for Accelerated carbonation Testing.