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（大連理工大學(xué)海岸和近海工程國家重點(diǎn)實(shí)驗(yàn)室，大連 116024）

［摘要］研究了普通混凝土（NC）、聚丙烯纖維混凝土（PPFRC）和聚丙烯腈纖維混凝土（PANFRC）在常溫及300，600，1 000℃高溫后的抗壓強(qiáng)度和抗折強(qiáng)度，分析了高溫加熱方式及加載條件不同的影響。研究表明，300 ℃高溫下混凝土的劣化主要受升溫速率的影響；600 ℃以上高溫下混凝土的劣化主要受溫度的影響。摻入低摻量的PP纖維和PAN纖維可緩解混凝土的高溫劣化，從而提高高溫后混凝土的抗壓強(qiáng)度和背火面加載時(shí)的抗折強(qiáng)度。

［關(guān)鍵詞］合成纖維；高溫；抗壓強(qiáng)度；抗折強(qiáng)度；聚丙烯纖維；聚丙烯腈纖維

Experimental research on strength of synthetic fiber reinforced concrete after high temperatures

Wang Yuehua, Ding Yining(The State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology, Dalian 116024, China)

Abstract:The compressive strength and the flexural strength of Normal Concrete(NC), Polypropylene Fiber Reinforced Concrete(PPFRC) and Polyacrylonitrile Fiber Reinforced Concrete (PANFRC) under normal temperature and after different high temperatures of 300℃, 600℃, 1 000℃ are investigated, and the influences of different high-temperature heating methods and loading conditions are analyzed. The results show that, the deterioration of concrete under high temperature of 300℃ is mainly influenced by heating rate, while the deterioration of concrete under high temperature upwards of 600℃ is mainly influenced by temperature. Mixing PP fiber or PAN fiber with low content can mitigate the high-temperature deterioration of concrete, with the result of improving the compressive strength of concrete after high temperature and also improving the flexural strength of concrete when loading on the unexposed surface after fire.

Keywords:synthetic fiber; high temperature; compressive strength; flexural strength; Polypropylene Fiber; Polyacrylonitrile Fiber

*國家自然科學(xué)基金資助項(xiàng)目（50278013）。

作者簡(jiǎn)介：王岳華，博士研究生,Email：yhwang78@hotmail.com。

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