WO2022252465A1 - 一种铣削型钢纤维及其在超高性能混凝土和耐磨地坪中的应用 - Google Patents

一种铣削型钢纤维及其在超高性能混凝土和耐磨地坪中的应用 Download PDF

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WO2022252465A1
WO2022252465A1 PCT/CN2021/123965 CN2021123965W WO2022252465A1 WO 2022252465 A1 WO2022252465 A1 WO 2022252465A1 CN 2021123965 W CN2021123965 W CN 2021123965W WO 2022252465 A1 WO2022252465 A1 WO 2022252465A1
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steel fiber
ultra
performance concrete
high performance
milled
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PCT/CN2021/123965
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English (en)
French (fr)
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杨医博
夏英淦
刘少坤
肖祺枫
余之豪
温礼静
黄云龙
郭文瑛
王恒昌
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华南理工大学
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Publication of WO2022252465A1 publication Critical patent/WO2022252465A1/zh

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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/38—Fibrous materials; Whiskers
    • C04B14/48—Metal
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F15/00—Flooring
    • E04F15/12—Flooring or floor layers made of masses in situ, e.g. seamless magnesite floors, terrazzo gypsum floors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • the invention belongs to the field of construction engineering materials, and in particular relates to a milled steel fiber and its application in ultra-high performance concrete and ultra-high performance concrete wear-resistant floor.
  • the common milling steel fiber section on the market is arc-shaped, the inner arc surface is rough, the outer arc surface is smooth, the length is 30-34mm, the section width is 1.4-3.8mm, the section thickness is 0.1-0.4mm, and the tensile strength is 700 ⁇ 1000MPa.
  • Its bonding strength with ordinary concrete is relatively high, but experiments in ultra-high performance concrete have shown that ordinary milled steel fibers have the disadvantages of low tensile strength, too long fibers, and poor toughness. The fiber is broken and it is difficult to exert its excellent bonding performance.
  • the primary object of the present invention is to provide a milled steel fiber.
  • the milled steel fiber of the invention is used for ultra-high performance concrete, and has high strength, good toughness, rough surface and end hooks. Compared with micro-wire steel fibers, it has the characteristics of high bonding strength and strong mechanical interlocking force; compared with ordinary milled steel fibers, it has the characteristics of high strength and high toughness, which can effectively improve the first crack strength of ultra-high performance concrete.
  • Another object of the present invention is to provide the application of the milled steel fiber mentioned above in ultra-high performance concrete and ultra-high performance concrete wear-resistant floor.
  • a milled steel fiber obtained by milling high-strength steel ingots or steel plates, including a steel fiber body with a circular arc or approximately rectangular cross section, the steel fiber body is straight, arched or wavy, and its upper and lower surfaces or the entire surface Rough, with end hooks on both ends.
  • the tensile strength of the milled steel fiber is 1500-2500 MPa, and the surface of the milled steel fiber body is rough, which greatly increases the contact area with the cement matrix, so that the bond strength between the steel fiber and the matrix is greatly improved; both The end has an end hook, which further strengthens the anchoring force of the steel fiber, so that the mechanical properties of the steel fiber can be fully exerted, so that the initial cracking strength of the ultra-high performance concrete can be improved.
  • the milled steel fiber has a length of 12-22 mm, a section width of 2-3 mm, a section thickness of 0.2-0.4 mm, and a hook length of 1-2 mm at the end.
  • the steel fiber body is straight, and the length of the straight line part is ⁇ 2/3 of the total length of the fiber; the steel fiber body is arched, and the arc of the arch is 25-45°, more preferably 25-35° ;
  • the steel fiber body is wavy, with two wave crests, and the wave height is 0.6-1.2mm.
  • the steel fiber body is straight, with end hooks at both ends.
  • the end hooks are in the shape of a broken line, and the straight part can be twisted, which greatly enhances the mechanical interlocking force of the steel fiber, thereby improving the interface between the steel fiber and the matrix. Bond strength.
  • the arched steel fiber body Compared with the straight shape, the arched steel fiber body has better abrasion resistance, can give full play to the toughness advantages of the fiber, improve its cooperative work with the concrete matrix, and achieve the purpose of strengthening and toughening.
  • the wavy steel fiber is provided with two crests, the wave height is 0.6-1.2mm, which increases the contact area between the steel fiber and the matrix, improves the bonding efficiency of the steel fiber, and helps to achieve the uniformity of the anchoring force in all directions, and then Enhance the anchoring force of steel fiber and matrix.
  • the surface of the milled steel fiber can also be treated with anti-corrosion treatment.
  • anti-corrosion treatment By preparing an anti-corrosion layer on the surface of the steel fiber body, the corrosion resistance of the steel fiber is greatly improved, so it can be used in more complex and harsh environments.
  • the application is: adding the milled steel fiber alone or mixed with the microwire steel fiber in ultra-high performance concrete and ultra-high performance concrete wear-resistant floor components, wherein the milled steel fiber volume is 1-10%, the micro-wire steel fiber volume content is 0-4%.
  • the volume content of the milling type steel fiber is 1-6%, and the volume content of the microwire steel fiber is 1-4%.
  • An ultra-high-performance concrete wear-resistant floor comprising an ordinary concrete base, a reinforced steel grid frame and the above-mentioned milled steel fiber reinforced ultra-high-performance concrete surface layer, wherein the milled steel fiber volume content is 1 to 6%, and the reinforced steel
  • the grid frame is located in the ultra-high performance concrete layer and connected with ordinary concrete through connectors.
  • the present invention has the following advantages and beneficial effects:
  • the surface of the milled steel fiber of the present invention is rough, which greatly increases the contact area with the ultra-high performance concrete matrix, so that the bonding strength between the steel fiber and the ultra-high performance concrete matrix is greatly improved.
  • the tensile strength of the milled steel fiber of the present invention is 1500-2500 MPa, and by adopting a straight, arched or wavy structure with end hooks at both ends, the synergy between it and the ultra-high performance concrete matrix can be improved Work, so that the mechanical properties of steel fibers can be fully exerted, thereby improving the first crack strength of ultra-high performance concrete, giving full play to the toughness advantages of steel fibers, and achieving the purpose of strengthening and toughening.
  • the present invention When the present invention is applied to the field of ultra-high-performance concrete wear-resistant floors, it can enhance the impact resistance of wear-resistant floors under fatigue without using interlayer adhesives, reduce the generation of small cracks and Possible bumps under impact.
  • the milled steel fiber described in the present invention can effectively improve the crack resistance and impact resistance of ultra-high performance concrete, and it is not easy to produce tiny cracks, so as to achieve the crack resistance of ultra-high performance concrete under extreme environments and special requirements. And anti-shock requirements, prolong the service life of the structure, and have remarkable economic, social and environmental benefits.
  • Fig. 2 is a schematic diagram of milling arched steel fibers in the present invention, in which: end hook 1, cross-section inner arc 4, cross-section outer arc 5, arch arc ⁇ .
  • Fig. 3 is a schematic diagram of milling wave-shaped steel fibers in the present invention, in the figure: end hook 1, wave crest 6.
  • Fig. 4 is the sectional schematic view of milling type steel fiber among the present invention, among figure (a): milling profile steel fiber upper surface 2, lower surface 3 of approximate rectangular cross section; Among figure (b): circular arc cross section milling profile steel fiber inner arc surface 4 , outer arc 5.
  • Figure 5 is a schematic diagram of the overall structure of milling steel fibers used in ultra-high performance concrete wear-resistant floors in the present invention, in the figure: ordinary concrete base 9, reinforced steel grid frame 8, milling steel fiber reinforced ultra-high performance concrete surface layer 7, Transverse steel bar 10, longitudinal steel bar 11, short steel bar 12 for strengthening connection.
  • microwire steel fiber used as a comparison is provided by Guangdong Gaiteqi New Material Co., Ltd., copper-plated straight, with a diameter of 0.22mm, a length of 13mm, and a tensile strength of 2700MPa.
  • the following ultra-high-performance concrete matrix uses 42.5R Portland cement, quartz sand with a maximum particle size of 1.18mm, silica fume as undisturbed ash, polycarboxylate superplasticizer, and tap water.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Architecture (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Ceramic Engineering (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

一种铣削型钢纤维及其在超高性能混凝土和耐磨地坪中的应用。钢纤维由高强钢锭或钢板铣削得到，钢纤维截面为圆弧形或近似矩形，其上下表面或全表面粗糙，两端带有端勾，钢纤维长度为12～22mm，截面宽度为2～3mm，截面厚度为0.2～0.4mm，端部弯钩长度1～2mm，钢纤维抗拉强度为1500～2500MPa。其本体可为平直形、拱形和波浪形，表面设置防腐层。该铣削型钢纤维克服了普通铣削型钢纤维抗拉强度过低、韧性差的缺点；相比传统微丝钢纤维，具有粘结强度高、机械咬合力强等特点，可以有效提高超高性能混凝土的初裂强度，能进一步提高结构耐久性，优选应用领域为超高性能混凝土和超高性能混凝土耐磨地坪。

Description

一种铣削型钢纤维及其在超高性能混凝土和耐磨地坪中的应用 技术领域
本发明属于建筑工程材料领域，具体涉及一种铣削型钢纤维及其在超高性能混凝土和超高性能混凝土耐磨地坪中的应用。
背景技术
超高性能混凝土(UHPC)是一种基于骨料和胶凝材料紧密堆积、低水胶比、钢纤维增强的水泥基材料，具有超高强度、高韧性和优异耐久性，近年来在多个工程领域逐步开展工程应用。其最大骨料粒径小于8mm，通常骨料粒径小于2.36mm，其水胶比低于0.24，抗压强度不小于120MPa。
超高性能混凝土中通常采用的微丝钢纤维的纤维截面为圆形，直径为0.15～0.3mm，长度为10～20mm，平直型或端勾型，抗拉强度≥2000MPa；由于界面粘结强度远远低于钢纤维的抗拉强度，微丝钢纤维和超高性能混凝土基体协同工作效果不佳，对超高性能混凝土的抗初裂性能几乎没有影响。超高性能混凝土达到初裂强度后，超高性能混凝土开裂，内部微丝钢纤维在自然环境下会快速锈蚀，从而大幅降低结构耐久性，也使得超高性能混凝土的高耐久性难以发挥作用，急需开发能够提高超高性能混凝土初裂强度的方法。
目前市场上的普通铣削型钢纤维截面为圆弧形，内弧面粗糙，外弧面光滑，长度为30～34mm，截面宽度为1.4～3.8mm，截面厚度为0.1～0.4mm，抗拉强度为700～1000MPa。其与普通混凝土的粘结强度较高，但在超高性能混凝土中的实验表明：普通铣削型钢纤维存在抗拉强度过低、纤维过长、韧性差的缺点，在超高性能混凝土破坏时为纤维拉断，难以发挥其优异的粘结性能。
发明内容
为解决现有技术的缺点和不足之处，本发明的首要目的在于提供一种铣削型钢纤维。
本发明所述铣削型钢纤维用于超高性能混凝土，其强度高，韧性好，表面粗糙，带有端勾。相比微丝钢纤维，具有粘结强度高、机械咬合力强等特点；相比普通铣削型钢纤维，具有高强度、高韧性等特点，可以有效提高超高性能混凝土的初裂强度。
本发明的另一目的在于提供上述一种铣削型钢纤维在超高性能混凝土和超高性能混凝土耐磨地坪中的应用。
本发明目的通过以下技术方案实现：
一种铣削型钢纤维，由高强钢锭或钢板铣削得到，包括截面为圆弧形或近似矩形的钢纤维本体，所述钢纤维本体为平直形、拱形或波浪形，其上下表面或全表面粗糙，两端带有端勾。
优选地，所述铣削型钢纤维抗拉强度为1500～2500MPa，所述铣削型钢纤维本体，表面粗糙，大大增加了其与水泥基体的接触面积，使得钢纤维与基体的粘结强度大幅提升；两端带有端勾，进一步加强了钢纤维的锚固力，使得钢纤维的力学性能得到充分发挥，因而能提升超高性能混凝土的初裂强度。
优选地，所述铣削型钢纤维，长度为12～22mm，截面宽度为2～3mm，截面厚度为0.2～0.4mm，端部弯钩长度1～2mm。
优选地，所述钢纤维本体为平直形，其直线部分长度≥纤维总长的2/3；所述钢纤维本体为拱形，拱形弧度为25～45°，更优选为25～35°；所述钢纤维本体为波浪形，设有2个波峰，波高为0.6～1.2mm。
优选地，所述钢纤维本体为平直形，两端带有端勾，端勾为折线形，直线部分可扭转，极大增强了钢纤维的机械咬合力，进而提高钢纤维和基体的界面粘结强度。
所述拱形钢纤维本体，相比于直形，拱形有更好的磨耗能力，能充分发挥 纤维的韧性优势，提高其与混凝土基体的协同工作，实现增强增韧的目的。
所述波浪形钢纤维设有2个波峰，波高0.6～1.2mm，加大了钢纤维和基体的接触面积，提高了钢纤维粘结效率，有助于实现各方向锚固力的均匀性，进而增强钢纤维和基体的锚固力。
优选地，所述铣削型钢纤维所用合金钢材料由以下组分组成：Mn＝7.3～9.9％，C＝0.2～0.4％，Al＝1.3～2.1％，S＝0～0.016％，P＝0～0.012％，余量为Fe及不可避免的杂质。
优选地，所述铣削型钢纤维表面还可进行防锈蚀处理，通过在钢纤维本体表面制备防腐层，使得钢纤维耐腐蚀性能大大提高，因此可用于更加复杂恶劣的环境中。
上述一种铣削型钢纤维在超高性能混凝土和超高性能混凝土耐磨地坪中的应用。
优选地，所述应用为：将铣削型钢纤维单独掺加或与微丝钢纤维混合掺加于超高性能混凝土和超高性能混凝土耐磨地坪组分中，其中铣削型钢纤维体积掺量为1～10％，微丝钢纤维体积掺量为0～4％。
更优选地，所述铣削型钢纤维体积掺量为1～6％，微丝钢纤维体积掺量为1～4％。
一种超高性能混凝土耐磨地坪，包括普通混凝土基层、增强钢筋网架和上述铣削型钢纤维增强超高性能混凝土面层，其中铣削钢纤维体积掺量为1～6％，所述增强钢筋网架位于超高性能混凝土层内，并通过连接件与普通混凝土连接。
优选地，所述铣削型钢纤维增强超高性能混凝土面层的厚度为30～100mm。
与现有技术相比，本发明具有以下优点及有益效果：
(1)本发明所述铣削型钢纤维其表面粗糙，大大增加了其与超高性能混凝土基体的接触面积，使得钢纤维与超高性能混凝土基体的粘结强度大幅提升。
(2)本发明所述铣削型钢纤维抗拉强度为1500～2500MPa，通过采用平直形、拱形或波浪形的构造，两端带有端勾，能提高其与超高性能混凝土基体的 协同工作，使得钢纤维的力学性能得到充分发挥，从而提升超高性能混凝土的初裂强度，充分发挥钢纤维的韧性优势，实现增强增韧的目的。
(3)本发明所述铣削型钢纤维表面做防锈蚀处理，极大提高了钢纤维的耐腐蚀能力，因此可用于更加复杂恶劣的环境中。
(4)本发明应用于超高性能混凝土耐磨地坪领域时，可在不使用层间粘结剂的情况下增强耐磨地坪在疲劳作用下抗冲击性能，减小细小裂缝的产生及冲击下可能产生的隆起。
综合以上特点，本发明所述一种铣削型钢纤维，可以有效提升超高性能混凝土的抗裂性能和抗冲击性能，不易产生微小裂缝，从而达到极端环境和特殊要求下的超高性能混凝土抗裂和抗冲击要求，延长结构使用寿命，济效益、社会效益和环境效益显著。
附图说明
图1为本发明中铣削平直型钢纤维的示意图，图中：端勾1、截面上表面2、截面下表面3。
图2为本发明中铣削拱型钢纤维的示意图，图中：端勾1、截面内弧面4、截面外弧面5、拱形弧度α。
图3为本发明中铣削波浪型钢纤维的示意图，图中：端勾1、波峰6。
图4为本发明中铣削型钢纤维的截面示意图，图(a)中：近似矩形截面铣削型钢纤维上表面2、下表面3；图(b)中：圆弧形截面铣削型钢纤维内弧面4，外弧面5。
图5为本发明中铣削型钢纤维用于超高性能混凝土耐磨地坪的整体结构示意图，图中：普通混凝土基层9、增强钢筋网架8、铣削型钢纤维增强超高性能混凝土面层7、横向钢筋10、纵向钢筋11、加强连接用短钢筋12。
具体实施方式
下面结合实施例和附图对本发明作进一步详细的描述，但本发明的实施方式不限于此。
本发明实施例中未注明具体条件者，按照常规条件或者制造商建议的条件进行。所用未注明生产厂商者的原料、试剂等，均为可以通过市售购买获得的常规产品。
实施例1
如附图1和图4(a)，所述一种用于超高性能混凝土的铣削型钢纤维，外观为平直形，其抗拉强度为1500MPa，长度为12mm，截面近似矩形宽度为2.5mm，厚度为0.2～0.4mm，端部弯钩长度1mm，由钢板铣削得到，所述合金钢材料组成为：Mn＝7.5％，C＝0.3％，Al＝1.5％，S＝0.012％，P＝0.01％，余量为Fe及不可避免的杂质。
实施例2
如附图2和图4(b)，所述一种用于超高性能混凝土的铣削型钢纤维，外观为拱形，其抗拉强度为2000MPa，弦长度为22mm，截面为圆弧形，宽度为2mm，厚度为0.2～0.4mm，端部弯钩长度2mm，弧度α为33°，由钢锭铣削得到，所述合金钢材料组成为：Mn＝8.0％，C＝0.25％，Al＝1.8％，S＝0.008％，P＝0.01％，余量为Fe及不可避免的杂质。
实施例3
如附图3和图4(b)，所述一种用于超高性能混凝土的铣削型钢纤维，外观为波浪形，其抗拉强度为2500MPa，长度为16mm，截面为圆弧形，宽度为3mm，厚度为0.2～0.4mm，端部弯钩长度1.5mm，设有2个波峰6，波高0.6mm，由钢锭铣削得到，所述合金钢材料组成为：Mn＝9.0％，C＝0.2％，Al＝2％，S＝0.008％，P＝0.01％，余量为Fe及不可避免的杂质。
对比例1
作为比对的微丝钢纤维由广东盖特奇新材料有限公司提供，镀铜平直型，直径为0.22mm，长度为13mm，抗拉强度为2700MPa。
本发明优势体现于超高性能混凝土的应用中，故将实施例1-3所述钢纤维掺入超高性能混凝土中并与比例1进行对比，分析其力学性能差异。
下述超高性能混凝土基体采用42.5R硅酸盐水泥，最大粒径为1.18mm的石英砂，硅灰为原状灰，聚羧酸减水剂水剂，自来水。
共设计了4组掺入不同类型钢纤维的超高性能混凝土配比，每组配比的比例在表1给出，各组分按重量比例份数给出，表2为各编号的铣削钢纤维超高性能混凝土的性能。
表1超高性能混凝土配合比
序号 水泥 硅灰 砂 减水剂 水 钢纤维
1.微丝钢纤维(对比例1) 800 200 1195 50 157 150
2.铣削平直型钢纤维(实施例1) 800 200 1195 50 157 150
3.铣削拱型钢纤维(实施例2) 800 200 1195 50 157 150
4.铣削波浪型钢纤维(实施例3) 800 200 1195 50 157 150
表2超高性能混凝土性能
序号 初裂强度(MPa) 抗压强度(MPa) 相对磨损量(％)
1.微丝钢纤维(对比例1) 9.2 150 100
2.铣削平直型钢纤维(实施例1) 11.3 161 88.5
3.铣削拱型钢纤维(实施例2) 12.1 157 87.1
4.铣削波浪型钢纤维(实施例3) 12.8 159 89.3
上述四组超高性能混凝土中，由于铣削钢纤维与UHPC良好的界面粘结性能，大大加强了UHPC的初裂强度，其中波浪形铣削钢纤维的初裂强度最高。
实施例4
如图5所示，本发明一种用于超高性能混凝土的铣削型钢纤维可用于耐磨地坪的领域，耐磨地坪包括铣削型钢纤维增强超高性能混凝土面层7、增强钢筋网架8、普通混凝土基层9、横向钢筋10、纵向钢筋11、加强连接用短钢筋12。
本实施例所以超高性能混凝土配合比及性能如表1和表2。耐磨性能试验按《公路工程水泥及水泥混凝土试验规程》(JTGE30—2005)采用质量损失法，尺寸采用150×150×150mm立方体标准试件，每种配合比制作3组试件并取平均 值。
浇筑普通混凝土基层，放置已经绑扎好的增强钢筋网架，迅速浇筑铣削型钢纤维增强超高性能混凝土形成面层，其中铣削型钢纤维增强超高性能混凝土面层厚度为80mm。
增强钢筋网架中横向钢筋10和纵向钢筋11的规格均为12@200，横向钢筋10为U型，纵向钢筋11位于U型开口处，适用于铣削型钢纤维增强超高性能混凝土面层厚度为60～100mm。
如表2所示，本实施例通过掺加铣削型钢纤维在超高性能混凝土中，在不使用层间粘结剂的情况下降低耐磨地坪在疲劳作用下的质量磨损，减小细小裂缝的产生及冲击下可能造成的损伤。
上述实施例为本发明较佳的实施方式，但本发明的实施方式并不受上述实施例的限制，其他的任何未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合、简化，均应为等效的置换方式，都包含在本发明的保护范围之内。

Claims (10)

  1. 一种铣削型钢纤维，其特征在于，由高强钢锭或钢板铣削得到，包括截面为圆弧形或近似矩形的钢纤维本体，所述钢纤维本体为平直形、拱形或波浪形，其上下表面或全表面粗糙，两端带有端勾。
  2. 根据权利要求1所述一种铣削型钢纤维，其特征在于，所述铣削型钢纤维，长度为12～22mm，截面宽度为2～3mm，截面厚度为0.2～0.4mm，端部弯钩长度1～2mm；钢纤维抗拉强度为1500～2500MPa。
  3. 根据权利要求1所述一种铣削型钢纤维，其特征在于，所述钢纤维本体为平直形，其直线部分长度≥纤维总长的2/3；所述钢纤维本体为拱形，拱形弧度为25～45°；所述钢纤维本体为波浪形，设有2个波峰，波高为0.6～1.2mm。
  4. 根据权利要求1所述一种铣削型钢纤维，其特征在于，所述钢纤维本体为平直形，两端带有端勾，端勾为折线形，直线部分可扭转。
  5. 根据权利要求1所述一种铣削型钢纤维，其特征在于，所述铣削型钢纤维所用合金钢材料由以下组分组成：Mn＝7.3～9.9％，C＝0.2～0.4％，Al＝1.3～2.1％，S＝0～0.016％，P＝0～0.012％，余量为Fe及不可避免的杂质。
  6. 根据权利要求1所述一种铣削型钢纤维，其特征在于，所述铣削型钢纤维表面还可进行防锈蚀处理，通过在钢纤维本体表面制备防腐层。
  7. 权利要求1～6任一项所述一种铣削型钢纤维在超高性能混凝土和超高性能混凝土耐磨地坪中的应用。
  8. 根据权利要求7所述一种铣削型钢纤维在超高性能混凝土和超高性能混凝土耐磨地坪中的应用，其特征在于，将铣削型钢纤维单独掺加或与微丝钢纤维混合掺加于超高性能混凝土和超高性能混凝土耐磨地坪组分中，其中铣削型钢纤维体积掺量为1～10％，微丝钢纤维体积掺量为0～4％。
  9. 根据权利要求8所述一种铣削型钢纤维在超高性能混凝土和超高性能混凝土耐磨地坪中的应用，其特征在于，将铣削型钢纤维和微丝钢纤维混合掺加 于超高性能混凝土和超高性能混凝土耐磨地坪组分中，其中铣削型钢纤维体积掺量为1～6％，微丝钢纤维体积掺量为1～4％。
  10. 一种超高性能混凝土耐磨地坪，其特征在于，包括普通混凝土基层、增强钢筋网架和铣削型钢纤维增强超高性能混凝土面层，其中铣削钢纤维体积掺量为1～6％，所述增强钢筋网架位于超高性能混凝土层内，并通过连接件与普通混凝土连接，所述铣削钢纤维为权利要求1～6所述铣削型钢纤维，铣削型钢纤维增强超高性能混凝土面层的厚度为30～100mm。
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