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LI Cong, CHEN Bao-chun, WEI Jian-gang. Shrinkage and mechanical properties of UHPC with coarse aggregate[J]. Journal of Traffic and Transportation Engineering, 2019, 19(5): 11-20. doi: 10.19818/j.cnki.1671-1637.2019.05.002
Citation: LI Cong, CHEN Bao-chun, WEI Jian-gang. Shrinkage and mechanical properties of UHPC with coarse aggregate[J]. Journal of Traffic and Transportation Engineering, 2019, 19(5): 11-20. doi: 10.19818/j.cnki.1671-1637.2019.05.002
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Shrinkage and mechanical properties of UHPC with coarse aggregate

doi: 10.19818/j.cnki.1671-1637.2019.05.002
  • 1.

    School of Civil Engineering, Fuzhou University, Fuzhou 350108, Fujian, China

  • 2.

    School of Civil Engineering, Fujian University of Technology, Fuzhou 350118, Fujian, China

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    Abstract
  • To reduce the shrinkage and cracking risk of ultra-high-performance concrete(UHPC), the autogenerous shrinkage, basic mechanical properties(compressive strength, tensile strength and elastic modulus), aggregate gradation and restrained ring shrinkage tests on five groups UHPCs with different coarse aggregate contents(mass fractions are 0, 12.5%, 22.5%, 32.5%, and 42.5%, respectively) were studied. The influences of coarse aggregate content and aggregate gradation on the autogenerous shrinkage and basic mechanical properties of UHPC were analyzed. The proposed relative difference of shrinkage-cracking stress was used to evaluate the effect of coarse aggregate incorporation on the shrinkage-cracking of UHPC. The cracking performances of UHPCs with and without coarse aggregate under restrained ring were tested and compared. The effectiveness of coarse aggregate incorporation on reducing the shrinkage-cracking of UHPC was verified, and the suggestions for the coarse aggregate content and the maximum particle size limitation in UHPC were given. Research result shows that the autogenous shrinkage of UHPC at early age reduces with the increase of coarse aggregate content, and the maximum decreasing amplitude is about 20%. The effect degrees of coarse aggregate on the elastic modulus, compressive strength and tensile strength of UHPC are depended on its content and gradation. When the coarse aggregate content is 22.5%, the aggeregate gradation curve is almost inside the range of Fuller's and Talbot's curves. It is the most closely packed group among the five material groups. The coarse aggregate of this group has the most remarkable effect on the improvement of elastic modulus and compressive strength of UHPC, and has the minimum effect on the reduction of tensile strength. The maximum relative difference of shrinkage-cracking stress of UHPC with the coarse aggregate content of 22.5% is up to 1.31 MPa. It is the optimal content in the tests and can effectively reduce the risk of shrinkage-cracking. Comparing the UHPC without coarse aggregate, the levels of residual stress and tensile stress of UHPC with the coarse aggregate content of 22.5% under the restrained ring decreases by 15.8% and 14.7%, respectively, indicating that its crack resistance improves. The UHPC with closely packing coarse aggregate is recommended to achieve the material properties as high as possible. The maximum particle size of coarse aggregate can relaxes to 9.5 mm for the UHPC with steel fiber length of 12-20 mm.

     

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