Mechanical performance and chloride penetration resistance of concretes with low cement contents

Cândido, Taíssa Guedes; Meira, Gibson Rocha; Quattrone, Marco; John, Vanderley M.

doi:10.1590/s1983-41952022000600008

Cited by 3 publications

(1 citation statement)

References 34 publications

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“…This stressed the need for further studies to properly assess the effect of different materials used in concrete composites. Cândido et al [41] noted a pre-existing relation between pore alignment and both concrete strength and chloride ion attack. However, total porosity or void index might not be representative of the ingress of this agent since, as noted by Helene [13], the level of mass transport depended on pore diameter.…”

Section: Chloride Attack (Salt Spray)mentioning

confidence: 99%

Proposed variations in nominal reinforcement cover based on the environmental aggressivity class (EAC) of concrete exposure

Pacheco,

Ehrenbring,

Christ

et al. 2024

Rev. IBRACON Estrut. Mater.

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The physical and chemical protection of steel reinforcement afforded by the cover is a consequence of the quality of the concrete and its thickness, with a long-term impact on durability and service life. This study proposed variations in cover based on environmental aggressivity class (EAC) of exposure considering concretes of prescribed compressive strength classes (C20/C25/C30/C40). To this end, concrete mixtures were subjected to accelerated testing in salt spray chambers or carbonation. Accelerated testing was kept for periods long enough to reach each EAC cover level. Thus, the effect of each EAC, from mild to severe, was determined on the physical and mechanical characteristics of each mixture. It was determined that the required reinforcement cover varied linearly with compressive strength. This denoted the possibility of using more than one class of concrete and cover for each EAC. It should be noted that the difference in required cover became greater when using concrete with a strength class higher than C30. Still, it was noticed that the chloride ions attack s was more severe than carbonation and was, for most of the test cases, the determinant factor in minimum cover thickness to ensure the desired durability.

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Section: Chloride Attack (Salt Spray)mentioning

confidence: 99%

Proposed variations in nominal reinforcement cover based on the environmental aggressivity class (EAC) of concrete exposure

Pacheco,

Ehrenbring,

Christ

et al. 2024

Rev. IBRACON Estrut. Mater.

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show abstract

Complex Modulus characterization of an Optimized Binder with SCMs: proposition of an enhanced Cement formulation to improve Stiffness Behavior and Durability of Mortars and Concretes

et al. 2023

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Materials optimization is an aspect of continuous endeavor for civil engineering in many applications, especially in construction where the materials' durability and mechanical performance are crucial for structural integrity. Structures such as aerogenerators, both towers and foundations, are highly susceptible to cyclic loads with a broad range of frequencies and levels. The improvement of the stiffness behavior can signi cantly enhance their fatigue resistance and consequently durability. This paper aims to evaluate the impact of a high-performance binder optimization, using supplementary cementitious materials (SCMs) to improve the mechanical behavior of mortars and concretes, by improving stiffness response under dynamic loading, which is related to durability and fatigue lifeservice. Static tests (axial compressive and splitting tensile strengths) were conducted as well as cyclic stiffness tests that were proposed as a new methodology for these kinds of materials, that may better relate to dynamic behavior in eld. The proposition consists of testing complex modulus tests under sinusoidal loading either in pure compression or in pure tension, adopting low (0.1 Hz to 1 Hz) and midrange (1 Hz to 25 Hz) loading frequencies. The results show that the optimized binder resulted in a superior material with up to 23% stiffer loading response and 13.8% more energy storage elastically, with also inferences on improved durability, which is expected to delay pathological manifestations. The proposed testing protocol obtained results compatible with the literature and seems applicable for evaluating the dynamic behavior of cementitious materials.

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Complex Modulus characterization of an optimized binder with SCMs: proposition of an enhanced cement formulation to improve stiffness behaviorand durability of mortars and concretes

Targino¹,

Holanda

Henriquez

et al. 2023

Preprint

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Materials optimization is an aspect of continuous endeavor for civil engineering in many applications, especially in construction where the materials’ durability and mechanical performance are crucial for structural integrity. Structures such as aerogenerators, both towers and foundations, are highly susceptible to cyclic loads with a broad range of frequencies and levels. The improvement of the stiffness behavior can significantly enhance their fatigue resistance and consequently durability. This paper aims to evaluate the impact of a high-performance binder optimization, using supplementary cementitious materials (SCMs) to improve the mechanical behavior of mortars and concretes, by improving stiffness response under dynamic loading, which is related to durability and fatigue life-service. Static tests (axial compressive and splitting tensile strengths) were conducted as well as cyclic stiffness tests that were proposed as a new methodology for these kinds of materials, that may better relate to dynamic behavior in field. The proposition consists of testing complex modulus tests under sinusoidal loading either in pure compression or in pure tension, adopting low (0.1 Hz to 1 Hz) and mid-range (1 Hz to 25 Hz) loading frequencies. The results show that the optimized binder resulted in a superior material with up to 23% stiffer loading response and 13.8% more energy storage elastically, with also inferences on improved durability, which is expected to delay pathological manifestations. The proposed testing protocol obtained results compatible with the literature and seems applicable for evaluating the dynamic behavior of cementitious materials.

show abstract

Mechanical performance and chloride penetration resistance of concretes with low cement contents

Cited by 3 publications

References 34 publications

Proposed variations in nominal reinforcement cover based on the environmental aggressivity class (EAC) of concrete exposure

Proposed variations in nominal reinforcement cover based on the environmental aggressivity class (EAC) of concrete exposure

Complex Modulus characterization of an Optimized Binder with SCMs: proposition of an enhanced Cement formulation to improve Stiffness Behavior and Durability of Mortars and Concretes

Complex Modulus characterization of an optimized binder with SCMs: proposition of an enhanced cement formulation to improve stiffness behaviorand durability of mortars and concretes

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