Abstract
Steel fiber ultrahigh performance concrete (UHPC) and rubber ultrahigh performance concrete (UHPC) adopt the methods of “rigidity overcomes rigidity” and “softness overcomes rigidity,” respectively, to resist the abrasion and cavitation erosion caused by water flow carrying large solid particles. The above two have been applied in engineering successfully, but there are differences in material properties, mechanical properties, and microstructures. In this study, we will analyze the difference of abrasion resistance performance of the above two kinds of UHPC, in terms of, for example, compressive strength, abrasion resistance strength, abrasion rate, and microstructure in different ages, so as to provide a new material and method. The results indicate that the steel fiber UHPC compressive strength is higher than that of rubber UHPC (containing 1% steel fiber), and the abrasion resistance performance of steel fiber UHPC is lower than that of rubber UHPC (containing 1% steel fiber) when the rubber content is 10% and 12.5%. With the increase of steel fiber content, the compressive strength of steel fiber UHPC is not significantly improved, and the influence of water-binder ratio (W/B) on UHPC is higher than that of steel fiber content. With the increase of rubber content, the rubber UHPC compressive strength decreases, abrasion resistance strength decreases, and abrasion rate increases. The cement paste-aggregate interface transition zone (ITZ) of steel fiber UHPC and rubber UHPC has few internal voids and high compactness; however, the ITZ of steel fiber UHPC is denser than that of rubber UHPC.
Highlights
As we all know, the common abrasion occurs in hydraulic structures, pavement, workshop floor, and pier to which friction forces are applied due to relative motion between the surfaces and moving objects [1,2,3]
To evaluate the abrasion resistance performance of ultrahigh performance concrete (UHPC) according to ASTM C1138 underwater method and the test code for hydraulic concrete (SL352-2006) underwater steel ball method [32, 33], a φ300 mm × 100 mm cylindrical concrete specimen was prepared before the abrasion resistance test, and the abrasion resistance specimens were placed in water for more than 48 h. e test apparatus of underwater steel ball method is presented in Figure 2. e motor speed of the abrasion resistance test machine is set to 1200 r/min, and the impact abrasion time is set to 72 h
Experimental Results and Analysis e UHPC was prepared according to the orthogonal test scheme designed above, and the test pieces have the sizes of 100 mm × 100 mm × 100 mm for compression specimen and φ300 mm × 100 mm for abrasion resistance specimen. e curing was carried out in the standard curing room, and the compressive strength of the specimens with ages of 3 d, 7 d, and 28 d was measured. e abrasion resistance test was conducted on the UHPC specimens cured to 28 d
Summary
The common abrasion occurs in hydraulic structures (such as spillway, overflow dam, and spillway tunnel), pavement (such as cement concrete pavement and airport runway), workshop floor, and pier to which friction forces are applied due to relative motion between the surfaces and moving objects [1,2,3]. More than one study showed that the SFRC improves the compressive strength and abrasion resistance performance but often occurs in the mixing fiber in concrete uniform distribution and twisting clusters extremely It reduces the workability of concrete and causes the poor uniformity of concrete. E above investigation into the resisting erosion and abrasion of SFRC and rubber concrete adopts the following methods, respectively: (1) “rigidity overcomes rigidity” for adopting high-strength concrete, aiming at erosion and abrasion damage of bed load with large particles in high water head reservoir area; (2) “softness overcomes rigidity” for adopting flexible materials to resist erosion and abrasion damage, which is applicable to hydraulic structures with low water head. The reason is analyzed for the difference between two kinds of UHPC in abrasion resistance performance which provides a new material and method to solve the abrasion resistance failure of hydraulic concrete [27,28,29]
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