Abstract
The characteristic tensile strain of reactive powder concrete is a critical indicator of its resistance to cracking. In order to study its crack resistance performance, in this study, we investigated changes over time in the characteristic tensile strain patterns of reactive powder concrete. An axial tensile test was performed to obtain the stress–strain curves of reactive powder concrete after curing ages from 3 to 56 days, and then we identified changes over time in the initial and ultimate tensile strain patterns. An analysis was conducted to determine the correlation between the initial tensile strain and the ratio of tensile strength to elastic modulus. The correlations between the ultimate tensile strain and its curing age as well as that of the ultimate tensile strain with its tensile strength and its compressive strength were established, and an approach was proposed for calculating the characteristic age of reactive powder concrete.
Highlights
Relationships among the Reactive powder concrete (RPC) is a fiber-reinforced cement-based composite material that exhibits ultra-high strength, high toughness, high volume stability, high durability, and low permeability [1,2]
Tasdemir [16] argued that the ultimate axial tensile strain of concrete exhibited a typical linear relationship with the ratio of axial tensile strength to elastic modulus, regardless of the type, size, or gradation of the aggregate and how the test was performed, the length o the strain gauge, curing age, as well as the load application rate had little effect on this result, suggesting that the application of strain as the judgment criterion would be more effective for predicting RPC
The test results intuitively reflected the trends of characteristic tensile strain of RPC at different curing ages, and we summarized the relationships among curing age, compressive strength, tensile strength, and characteristic tensile strain; laying a foundation for studies on RPC
Summary
Relationships among the Reactive powder concrete (RPC) is a fiber-reinforced cement-based composite material that exhibits ultra-high strength, high toughness, high volume stability, high durability, and low permeability [1,2]. In addition to emphasizing the applications of the ultra-high compressive strength of RPC, the specifications of RBC all highlight the neglected tensile properties of conventional concrete materials; the axial tensile performance of RPC is considered to be the critical index of its structural design [8]. Tasdemir [16] argued that the ultimate axial tensile strain of concrete exhibited a typical linear relationship with the ratio of axial tensile strength to elastic modulus, regardless of the type, size, or gradation of the aggregate and how the test was performed, the length o the strain gauge, curing age, as well as the load application rate had little effect on this result, suggesting that the application of strain as the judgment criterion would be more effective for predicting RPC cracking. The test results intuitively reflected the trends of characteristic tensile strain of RPC at different curing ages, and we summarized the relationships among curing age, compressive strength, tensile strength, and characteristic tensile strain; laying a foundation for studies on RPC crack resistance
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