The application of Multi-function Road Surface (MRS) in the anti-skid maintenance of steel deck of Zhongshan Guangming Bridge was introduced and the mechanical properties of MRS binder and the high temperature stability, water stability, adhesive property of MRS pavement were comprehensively studied. The results indicated that MRS binder had excellent bond strength and durability; MRS pavement had excellent high temperature stability, water stability, adhesive properties, and the skid resistance of the steel deck was improved significantly. The bond strength of MRS binder to steel and tensile lap-shear strength of MRS binder were 19.2 MPa and 17.6 MPa, respectively, and its bond strength to concrete was 3.1 MPa with all breaks found in concrete. After exposure to damp heat for 20 days and 5 high-low temperature cycles, the bond strength of MRS binder was 3.2MPa and 3.3MPa, respectively, and all breaks of the samples were found in concrete. The dynamic stability of MRS pavement was 25245 times/mm at 70 , 0.9 Mpa, and its immersion Marshall residual stability was 95.4%, and the bond strength of MRS overlay was 4.4MPa. The British pendulum number of the deck at dry and wet state was increased from 60, 36 to 97 and 86, respectively. And the water permeability coefficient of the MRS pavement was 0 ml/min.
The origins of early Paleozoic orogen in South China have two different models: subduction model and intra‐continental model. Here we report two new identification of ~440 Ma arc‐related ultramafic intrusions in Tingzifan (TZF) and Fomuting (FMT) along Jiangshan‐Shaoxing fault (JSF) in South China, respectively. The Silurian ultramafic intrusions are composed of olivine pyroxenite, the SiO2, MgO and TiO2 contents of olivine pyroxenites are 39.67–41.25 wt%, 28.98–31.38 wt% and 0.23–0.51 wt%, respectively. The geochemical compositions of the olivines, clinopyroxenes and hornblendes suggest an arc‐related environment for these intrusions. As for the whole‐rock trace elements, the ultramafic intrusions contain low total rare earth element (REE) contents (27.59–34.26 μg/g) and high field strength elements (HFSEs), such as Nb, Zr, Hf, Ti, and are systematically enriched in large ion lithophile elements and light rare earth elements (LREEs). Trace element compositions share most features of Alaskan‐type ultramafic‐mafic intrusions. Isotopically, the TZF and FMT ultramafic intrusions are characterized by negative Zircons εHf(t) values (0.38–7.54). Combined with their whole‐rock and mineral chemistry as well as zircon Hf isotope, we suggest that the Alaskan‐type TZF and FMT pyroxenite were formed at the root of the continental arc by underplating and fractional crystallization of mafic magma which derived from subduction metasomatized mantle source. Thus, we proposed that the early Paleozoic ultramafic–mafic along Jiangshan‐Shaoxing fault were most likely related to early Paleozoic subduction of the Paleo‐South China Ocean between Cathaysia and Yangtze blocks, arguing that the origins of early Paleozoic orogen in the South China Block is a typical subduction‐accretionary collisional‐type orogenic belt rather than an intraplate belt.
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