钢纤维主要用于制造钢纤维混凝土,任何方法生产的钢纤维都能起到强化混凝土的作用。
纤维的增强效果主要取决于基体强度(fm),纤维的长径比(钢纤维长度l与直径d的比值,即I/d),纤维的体积率(钢纤维混凝土中钢纤维所占体积百分数),纤维与基体间的粘结强度(τ),以及纤维在基体中的分布和取向(η)的影响。当钢纤维混凝土破坏时,大都是纤维被拔出而不是被拉断,因此改善纤维与基体间的粘结强度是改善纤维增强效果的主要控制因素之一。
加入钢纤维的混凝土其抗压强度、拉伸强度、抗弯强度、冲击强度、韧性、冲击韧性等性能均得到较大提高。Steel fiber is mainly used in the manufacture of steel fiber concrete. Steel fiber produced by any method can strengthen concrete.
The reinforcement effect of the fiber mainly depends on the matrix strength (FM), the ratio of length to diameter of the fiber (the ratio of length of steel fiber to diameter D, I / D), the volume ratio of the fiber (the volume percentage of steel fiber in the steel fiber concrete), the bond strength between the fiber and the matrix (τ), and the influence of the distribution and orientation of the fiber in the matrix (η). When the steel fiber reinforced concrete is damaged, most of the fibers are pulled out rather than broken, so improving the bond strength between the fiber and the matrix is one of the main control factors to improve the fiber-reinforced effect.
The compressive strength, tensile strength, flexural strength, impact strength, toughness, impact toughness and other properties of the concrete with steel fiber are greatly improved.
原材料的检验:
必须满足上述原材料的质量控制标准,应按照公路工程施工技术规范的要求进行检验。
钢纤维混凝土的检验:
应重点检验钢纤维混凝土的和易性、塌落度和水灰.比等,同时必须现场目检钢纤维在混凝土的分布情况,发现有钢纤维结团现象应延长拌和时间。
钢纤维检测编辑
1、钢纤维的抗拉强度检验,要求其抗拉强度不低于380MPa;
2、钢纤维的抗弯拆性能,钢纤维应能经受直径3㎜钢棒弯拆90°不断,每批次检验不少于10根;
3、杂质含量,钢纤维表面不得有油污,不得镀有有害物质或影响钢纤维与混凝土粘接的杂质;
4、钢纤维的长度偏差不应**过标准长度的10%,每批次至少随机抽查10根以上;
5、钢纤维的直径或等效直径合格率不得低于90%,可采取重量法检验,每批次抽检100根,用天平称量,卡尺测其长度,要求得到的等效平均值满足规定。
钢纤维混凝土抗拉强度:
钢纤维混凝土抗拉强度,可通过试验所得的劈裂抗拉强度乘以强度折减系数0.80确定,劈裂抗拉强度试验方法按GB J81规定进行。
钢纤维混凝土抗拉强度标准值fftk=ftk(1+αt?ρf?lf/df);
其中,fftk,ftk--钢纤维混凝土抗拉强度标准值,设计值;
αt--钢纤维对钢纤维混凝土抗拉强度影响系数,宜通过试验确定;
ρf--钢纤维体积率(即钢纤维掺量体积率);
lf--钢纤维长度;
df--钢纤维直径或等效直径;
lf/df--钢纤维长径比
Tensile strength of steel fiber reinforced concrete:
The tensile strength of steel fiber reinforced concrete can be determined by multiplying the splitting tensile strength obtained from the test by the strength reduction coefficient of 0.80. The splitting tensile strength test method shall be carried out according to the provisions of GB J81.
Standard value of tensile strength of steel fiber reinforced concrete fftk = FTK (1 + α t? ρ f? LF / DF);
Among them, fftk, FTK - standard value and design value of tensile strength of steel fiber reinforced concrete;
The influence coefficient of α T-steel fiber on the tensile strength of steel fiber reinforced concrete should be determined by test;
ρ F - volume ratio of steel fiber (i.e. volume ratio of steel fiber content);
LF - steel fiber length;
DF - diameter of steel fiber or equivalent diameter;
LF / DF - steel fiber length diameter ratio
钢纤维混凝土弯拉强度(抗折强度)。
钢纤维混凝土用于公路路面、机场道面、或其它采用弯拉强度为设计指标的结构时,与钢纤维混凝土相应的集体混凝土的弯拉强度设计值的分级和使用范围,可按国家现行有关水泥混凝土路面、机场道面等行业设计规范的规定采用。
钢纤维混凝土弯拉强度设计值fftm=ftm(1+αtm?ρf?lf/df);
其中,fftm,ftm--钢纤维混凝土弯拉强度标准值,设计值;
αtm--钢纤维对钢纤维混凝土抗拉强度影响系数,宜通过试验确定;
ρf--钢纤维体积率(即钢纤维掺量体积率);
lf--钢纤维长度;
df--钢纤维直径或等效直径;
lf/df--钢纤维长径比。
Flexural tensile strength (flexural strength) of SFRC.
When steel fiber concrete is used in highway pavement, airport pavement, or other structures with bending tensile strength as the design index, the classification and application range of bending tensile strength design value of collective concrete corresponding to steel fiber concrete can be adopted according to the current national design specifications for cement concrete pavement, airport pavement and other industries.
The design value of flexural tensile strength of SFRC is FFTM = FTM (1 + α TM? ρ f? LF / DF);
Among them, FFTM, FTM - standard value of flexural tensile strength and design value of SFRC;
The influence coefficient of α TM steel fiber on the tensile strength of steel fiber reinforced concrete should be determined by test;
ρ F - volume ratio of steel fiber (i.e. volume ratio of steel fiber content);
LF - steel fiber length;
DF - diameter of steel fiber or equivalent diameter;
LF / DF - length diameter ratio of steel fiber.
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