Properties of Frost Damaged Concrete and the Estimation of the Degree of Frost Damage

Matsumura, Takashi; Katsura, Osamu; Yoshino, Toshiyuki

doi:10.3130/aijs.68.9_1

Cited by 8 publications

(6 citation statements)

References 3 publications

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“…The carbonation coefficients of all the mortar samples after damage are greater than before the damage. The above results clarify that all the mortar samples exhibit decreased bending strength and compressive strength and increased carbonation coefficient due to the micro cracks formed during freeze-thaw cycling [30].…”

Section: Bending Strength Compressive Strength and Carbonation Coefficient Of Mortar Samples After Damagesupporting

confidence: 56%

Experimental Investigation of Material Properties and Self-Healing Ability in a Blended Cement Mortar with Blast Furnace Slag

Zhang

Taniguchi

et al. 2020

Materials

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This paper presents the results of an experimental investigation on the material properties and self-healing ability of a blended cement mortar incorporating blast furnace slag (BFS). The effect of different types and Blaine fineness of BFS on the material properties and self-healing was investigated. Thirteen cement mixtures with BFS of different types and degrees of Blaine fineness are tested to evaluate the mechanical properties, namely compressive strength, bending strength, freeze–thaw, and accelerated carbonation. The pore structure is examined by means of mercury intrusion porosimetry. Seven blended mortar mixtures incorporating BFS for cement are used to evaluate the mechanical properties after applying freeze–thaw cycles until the relative dynamic modulus of elasticity reached 60%. The experimental results reveal that incorporating BFS improves the mechanical properties and self-healing ability. In the investigation of self-healing, smaller particle and high replacement ratios of BFS contribute to increasing the relative dynamic modulus of elasticity and decreasing the carbonation coefficient in the mortar after re-water curing. Moreover, BFS’s larger particles and high replacement ratio are found to provide better self-healing ability. A regression equation is created to predict the relative dynamic modulus of elasticity in mortar considering the Blaine fineness, BFS replacement ratio, and curing conditions.

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Section: Bending Strength Compressive Strength and Carbonation Coefficient Of Mortar Samples After Damagesupporting

confidence: 56%

Experimental Investigation of Material Properties and Self-Healing Ability in a Blended Cement Mortar with Blast Furnace Slag

Zhang

Taniguchi

et al. 2020

Materials

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“…15, 16 and 17, respectively. In each figure, the analytical results are compared with the previous experimental results (Hasan et al 2002a;Hasan et al 2002b;Hasan et al 2004;Matsumura et al 2003). The good correlations further prove the validity of this meso-scale model for predicting the macro-scale behavior of frost-damaged concrete.…”

Section: Strength-stiffness Relationship In Compression and Tensionmentioning

confidence: 84%

Mesoscale Simulation of Influence of Frost Damage on Mechanical Properties of Concrete

Ueda

Hasan

Nagai

et al. 2009

J. Mater. Civ. Eng.

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Meso-scale constitutive models of frost-damaged concrete are developed in this study through numerical simulation using a two-dimensional Rigid Body Spring Model (RBSM). The aim of the simulation is to predict the macro behavior of frost-damaged concrete subjected to mechanical loading. The models also clarify the difference in failure behavior of concrete with and without frost damage. Zero strength elements and the concept of meso-scale plastic tensile strain are introduced into the normal RBSM springs to consider the experimentally observed cracking and plastic deformation caused by frost damage. The difference in the effect of frost damage on compression and tension behavior as found in the experiments is clearly predicted.Finally, analysis of notched beam subjected to bending after different degrees of frost damage is

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“…In the point count test, which was used to quantify the change of the number of cracks after deterioration, the number of cracks in sample was analyzed using a modified point count procedure which was suggested by T. Matsumura et al (2003) who investigated experimentally the relationship between the number of cracks and degree of frost damage by means of image analysing microscope (with 100×magnification). It was inferred that the decrease of relative dynamic modulus can increase the number of cracks in concrete sample after the frost damage has taken place.…”

Section: Self-healing Of Fly Ashmentioning

confidence: 99%

Experimental Investigation on Reaction Rate and Self-healing Ability in Fly Ash Blended Cement Mixtures

Hama

Taniguchi

et al. 2012

ACT

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This paper investigates the hydration rate in fly ash blended cement paste and self-healing ability in mortar incorporating fly ash for long-term period. The hydration rate of fly ash and consumption of calcium hydroxide in fly ash paste containing calcium hydroxide reagents were examined at different ages and curing temperatures. Five types of fly ash blended cement paste, each of which with 10% by mass fly ash replacement ratio, were prepared for the acceleration test at 80 o C. Four fly ash cement pastes, with two types of fly ash and with fly ash replacement ratios by mass 10% and 30%, were tested to measure the rate of reaction of fly ash in the mixtures. Ten mixtures were tested to evaluate the self-healing ability of mortar incorporating fly ash, considering different types of cement and fly ash. Compressive strength, bending strength, accelerated carbonation depth, after applying freeze/thaw cycling until 60% and 80% relative dynamic modulus of elasticity, and porosity were examined. The experimental results revealed that incorporating fly ash in cement paste would affect the hydration rate of fly ash and consumption of calcium hydroxide. Curing temperature can affect hydration rate, acceleration rate and velocity of reaction rate in fly ash cement paste. Moreover, it is confirmed that self-healing ability, carbonation rate coefficient and the pore volume modification in mortar incorporating fly ash rely on the curing conditions. Finally, it is suggested that the practical fly ash replacement ratio in concrete could be 10% to 15% and 11% to 20% for water to cement ratios 0.50 to 0.55 and 0.55 to 0.60, respectively.

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Properties of Frost Damaged Concrete and the Estimation of the Degree of Frost Damage

Cited by 8 publications

References 3 publications

Experimental Investigation of Material Properties and Self-Healing Ability in a Blended Cement Mortar with Blast Furnace Slag

Experimental Investigation of Material Properties and Self-Healing Ability in a Blended Cement Mortar with Blast Furnace Slag

Mesoscale Simulation of Influence of Frost Damage on Mechanical Properties of Concrete

Experimental Investigation on Reaction Rate and Self-healing Ability in Fly Ash Blended Cement Mixtures

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