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Production of high early strength engineering cement-based composites with local components

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Document pages: 15 pages

Abstract: The rapid repair and renovation of existing transportation infrastructure requires dimensional stability and toughness repair materials, which can obtain high enough strength in a few hours to adapt to early large loads and deformations. Engineering cement-based composites (ECCS) are the representative of a new generation of high-performance fiber-reinforced cement-based composites (hpfrcc) with medium fiber content. ECC has great ductility and compact multi crack behavior, which shows that ECC can be used as an effective reinforcement material. The wide application of this material in China requires the use of all local ingredients. This study is based on Chinese raw materials, including matrix materials and all fiber, which have high early strengthh ECC (HES-ECC) was designed under the guidance of strain-hardening criterion of ECC. The matrix properties and fiber matrix interfacial micromechanics properties were obtained from three-point-bending test and single-fiber pullout test. The mechanical properties of HES-ECC were achieved by direct tensile test. The experimental results show that HES-ECC was successfully developed by using all Chinese materials. When using the domestic PVA fiber at 2 , the strength requirement can be achieved but only a low ductility. When using the domestic PE fiber at 0.8 , the strength and deformation requirement both can be obtained. The HES-ECC developed in this study exhibited compressive strength of more than 25 MPa within 6 hours, and an ultimate tensile strength of 5-6 MPa and tensile strain capacity of 3-4 after 60 days. Moreover, the cost of using domestic fiber can be largely reduced compared with using imported fiber, up to 70 ; it is beneficial to the promotion of these high-early-strength ECCs in the Chinese market.

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