Abstract
To investigate the relationships between the different mechanical strengths of internally cured concrete with Super Absorbent Polymer (SAP concrete), the uniaxial mechanical properties of SAP concrete with different internal curing water-cement ratios were studied. Various SAP concrete specimens were prepared, and the uniaxial compressive, splitting tensile, as well as four-point bending tests, were carried out using the electro-hydraulic servo testing machine. The cubic compressive strength, splitting tensile strength, and flexural strength of SAP concrete with different internal curing water-cement ratios was obtained. The converting relationships between the internal curing water-cement ratio and different mechanical strengths were analyzed extensively. Based on the conversion formulas of different strength indexes proposed by different national standards and other researchers, the equations among the splitting tensile strength, cubic compressive strength, and flexural strength of SAP concrete were proposed and verified using the experimental data. According to the comparative analysis results, the proposed equations in this study have significant applicability and can be conducted in the practical application of SAP concrete.
Highlights
The internal curing of concrete occurs when the pre-absorbed materials are dispersed inside the concrete, preventing the rapid loss of internal humidity and maintaining a fully hydrated concrete. Philleo (1991) proposed the first application of lightweight aggregate in providing additional moisture for the curing of high-strength concrete in 1991, and developed the concept of internal curing concrete
The following equations were obtained to fit the relationship between superabsorbent polymer (SAP) content and the corresponding strength of the SAP concrete: TABLE 3 | The load schemes in experiments
The relationship between compressive strength and flexural strength of SAP concrete should depend on the incorporated SAP content
Summary
The internal curing of concrete occurs when the pre-absorbed materials are dispersed inside the concrete, preventing the rapid loss of internal humidity and maintaining a fully hydrated concrete. Philleo (1991) proposed the first application of lightweight aggregate in providing additional moisture for the curing of high-strength concrete in 1991, and developed the concept of internal curing concrete. For the SAP with chemical polymer (such as sodium polyacrylate) as the main material and water absorption ratio of 20–30 g/g, and concrete with an effective water-cement ratio between 0.32 and 0.55, the mechanical conversion equations between various strengths were proposed, including the splitting tensile strength, cubic compressive strength, and flexural strength. Where Wic/C is the internal water-cement ratio and fcu, fsp, and ff are the cubic compressive strength, splitting tensile strength, and flexural strength of concrete specimens, respectively.
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