进行 了最 大粒径 为 25,31.5 mm 的连 续级配碎 石钢 纤 维高 强混凝 土 试验 ,研 究 了碎 石粒 径 、
水灰 比、钢纤 维长度 及体积 分数 对钢 纤维混凝 土拌 和物 坍 落度 和硬 化 钢 纤 维混 凝 土 立方 体抗 压 强
度 、轴 心抗压 强度 、劈 裂抗拉 强 度 、弯拉 强度 的影响规 律 ,并 与现行 规 程 CECS38:2004~纤维 混凝 土
结构技 术规程 》的相 关强度 计算公 式进 行 了对 比.结果 表 明 :钢 纤 维在 混 凝 土拌 和 物 中的 “棚 架”效
应 将产 生钢 纤维混凝 土拌和 物坍 落度 减 小的表 象,在振 动 作 用下该 效应 迅速 瓦解 而对 试 件成 型 影
响较 小 ;连续级 配碎 石最 大粒径 和钢 纤维长度 对钢 纤 维混 凝 土的 抗 压 、劈 裂 抗拉 强度 影响 较 小,但
对 钢纤 维混凝 土 弯拉 强度 的增 强效 果影 响较 大 ;可以采 用现行规 程确 定最 大粒径 为 31.5 mm 的连
续 级配碎石 钢 纤维 高强混凝 土的抗 压 、劈 裂抗拉 强度 ,但 弯拉 强度的试 验值 则低 于计 算值.
关键 词 :钢 纤维 高强混凝 土(SFRHSC);大粒径 碎 石 ;坍 落度
中图分类号 :TU528.572 文 献标 志码 :A doi:10.3969/j.issn.1007—9629.2010.02.005
Study of Steel_-Fiber Reinforced High__Strength Concrete
Containing Large Coarse Aggregate
ZHA0 Shun—bo, LJ Chang~yong, DU H ui, QIAN Xiao-j Ull
(School of Civil Engineering and Communication,North China Institute of W ater Conservancy and
Hydroelectric Power,Zhengzhou 450011,China)
Abstract:Tests were conducted to investigate the properties of steel—fiber reinforced high—strength concrete
(SFRHSC) containing large coarse aggregate in continuous gradation with maximum size of 25 m m and
3 1.5 m m respectively.The m ixture slump,the cubic and axial com pressive strength,the splitting—tensile
and flexural—tensile strength of SFRH SC are analyzed considering the factors of the maximum size of coarse
aggregate,the water to cement ratio,the length and the volum e fraction of steel fiber.The test results are
compared with that calculated by corresponding formulas specified in current technical specification for fi—
ber reinforced concrete structures CECS38:2004.It is proved that the rack—type effect of steel fiber in con—
crete mixture causes the m ixture slum p decrease,this effect is rapidly weaken and has not obviously influ—
ence on the vibration formation of SFRHSC. The compressive and splitting—tensile strength of SFRHSC
containing large coarse aggregate in continuous gradation with m aximum size of 3 1.5 mm are little influ—
enced by the maximum size of coarse aggregate and the steel fiber length. Therefore,for the flexural—ten—
sile strength,the compressive and splitting—tensile strength can be determined according to the current
technical specification. The experim ental value of flexural—tensile strength is lower than that calculated by
corresponding formulas specified in current technical specification.
Key words:steel-fiber reinforced high—strength concrete(SFRHSC);large coarse aggregate;slum p
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