Case study of a SAP-CRC bridge deck in Lu-shan County, Henan, China,Structural Concrete

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Case study of a SAP-CRC bridge deck in Lu-shan County, Henan, China
Structural Concrete ( IF 3.2 ) Pub Date : 2021-02-24 , DOI: 10.1002/suco.202000655
Wan‐wan Shi _{1,

2} , Han Zhu _{1,

2} , Yong Yu ₃ , Chuang‐dan Luo ₄ , Ji Shan ₅ , Ting Wang ₆

Affiliation

Three-Mile-River Bridge is located in Lu-shan County, Henan, China. The bridge length is 80 m and width is 17.25 m with the deck thickness being 0.3 m. The deck construction is finished in June 2018, which consumed 200 cubic meter of crumb rubber concrete (CRC) with added super-absorbent polymer (SAP), and opens for traffic in July 2018. This is the first case of SAP-CRC bridge deck reported to the public with “pump concrete” technical being employed. The scanning of SAP-CRC samples taken from the job site shows that rubber crumbs are largely uniformly distributed. The free restrained test on SAP-CRC concrete and the test of restrained externally squared eccentric ring experiment on the mortar specimens made by filtering 10 mm coarse crumbs out of paving concrete show that SAP-CRC exhibits an improved property in shrinkage behavior and cracking resistance. The original deck design is a three-layer configuration: 0.3 m concrete + water approval sealing + 0.03 m hot mix asphalt. Consider CRC's excellence in preventing cracking, the sealing, and hot mix asphalt is removed, which results in a 10% reduction in construction cost and time. It is a technical success to add SAP into fresh CRC to suppress so called “rubber particle up-floating phenomenon,” as well as an engineering/commercial success in the sense that this deck project is implemented following common practices of commercial construction operation and cost-saving, which sets an case study to future similar applications that potentially will consume large quantity, if not all, of recycled rubbers from scrap tires worldwide.

更新日期：2021-02-24

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