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高延性铁尾矿砂再生混凝土力学性能试验研究
Experimental Study on Mechanical Performance of Ductile Iron Tailings RAC
2019年第8期
再生骨料取代率;铁尾矿砂;再生混凝土;力学性能;高延性
Replacement ratio of recycled aggregate; Iron tailings; Recycled concrete; Mechanical property; High ductility
2019年第8期
10.19761/j.1000-4637.2019.08.093.04
国家自然科学基金资助项目(51178388);陕西省教育厅重点实验室科研计划项目(11JS059、12JS055)。
魏 涛1,全晓旖1,闫强强1,王纯轩2
1.西京学院土木工程学院,西安 710123;2.西安建筑科技大学土木工程学院,710055

魏 涛1,全晓旖1,闫强强1,王纯轩2

魏涛,全晓旖,闫强强,等.高延性铁尾矿砂再生混凝土力学性能试验研究[J].混凝土与水泥制品,2019(8):93-96.

WEI T,QUAN X Y,YAN Q Q,et al.Experimental Study on Mechanical Performance of Ductile Iron Tailings RAC[J].China Concrete and Cement Products,2019(8):93-96.

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摘 要:为了研究铁尾矿砂对高延性再生混凝土力学性能的影响,对12组108个再生粗骨料替代率为30%和50%的铁尾矿砂高延性再生混凝土进行试验研究,分析了不同铁尾矿砂掺量对再生混凝土抗压强度、劈裂抗拉强度和抗折强度的影响。结果表明,再生混凝土中掺入定量的PVA纤维后,再生粗骨料替代率为30%和50%的两种再生混凝土的力学性能随着铁尾矿砂掺量的增加均呈现先增长后下降的趋势,其抗压强度、劈裂抗拉强度及抗折强度基本呈正相关,并在铁尾矿砂掺量30%时达到峰值;当铁尾矿砂掺量相同时,再生骨料替代率越大其抗压强度越小;掺30%铁尾矿砂、再生骨料替代率30%的再生混凝土劈裂抗拉强度达到最大值;铁尾矿砂掺量30%时,再生骨料替代率30%和50%再生混凝土的抗折强度近似呈线性减小。 Abstract: In order to study the effect of iron tailings on the mechanical properties of high ductility recycled concrete, 108 recycled high ductility recycled concrete with 30% and 50% recycled coarse aggregate in 12 groups were tested and studied. The influence of different amount of iron tailings on compressive strength, splitting tensile strength and flexural strength of recycled concrete was analyzed. The results show that the mechanical properties of recycled concrete with recycled coarse aggregate replacement rate of 30% and 50% increase first and then decrease with the increase of iron tailings sand content. The compressive strength, splitting tensile strength and flexural strength of recycled concrete are positively correlated, and reach the peak at 30% iron tailings sand content. When the amount of recycled aggregate is equal, the greater the replacement rate of recycled aggregate, the smaller the compressive strength, and when the content of iron tailing sand is 30%, the splitting tensile strength of recycled concrete with 30% replacement ratio of recycled aggregate reaches the peak. When iron tailings sand content is 30%, the flexural strength of recycled concrete with recycled aggregate replacement rate of 30% and 50% decreases approximately linearly.
英文名 : Experimental Study on Mechanical Performance of Ductile Iron Tailings RAC
刊期 : 2019年第8期
关键词 : 再生骨料取代率;铁尾矿砂;再生混凝土;力学性能;高延性
Key words : Replacement ratio of recycled aggregate; Iron tailings; Recycled concrete; Mechanical property; High ductility
刊期 : 2019年第8期
DOI : 10.19761/j.1000-4637.2019.08.093.04
文章编号 :
基金项目 : 国家自然科学基金资助项目(51178388);陕西省教育厅重点实验室科研计划项目(11JS059、12JS055)。
作者 : 魏 涛1,全晓旖1,闫强强1,王纯轩2
单位 : 1.西京学院土木工程学院,西安 710123;2.西安建筑科技大学土木工程学院,710055

魏 涛1,全晓旖1,闫强强1,王纯轩2

魏涛,全晓旖,闫强强,等.高延性铁尾矿砂再生混凝土力学性能试验研究[J].混凝土与水泥制品,2019(8):93-96.

WEI T,QUAN X Y,YAN Q Q,et al.Experimental Study on Mechanical Performance of Ductile Iron Tailings RAC[J].China Concrete and Cement Products,2019(8):93-96.

摘要
参数
结论
参考文献
引用本文

摘   要:为了研究铁尾矿砂对高延性再生混凝土力学性能的影响,对12组108个再生粗骨料替代率为30%和50%的铁尾矿砂高延性再生混凝土进行试验研究,分析了不同铁尾矿砂掺量对再生混凝土抗压强度、劈裂抗拉强度和抗折强度的影响。结果表明,再生混凝土中掺入定量的PVA纤维后,再生粗骨料替代率为30%和50%的两种再生混凝土的力学性能随着铁尾矿砂掺量的增加均呈现先增长后下降的趋势,其抗压强度、劈裂抗拉强度及抗折强度基本呈正相关,并在铁尾矿砂掺量30%时达到峰值;当铁尾矿砂掺量相同时,再生骨料替代率越大其抗压强度越小;掺30%铁尾矿砂、再生骨料替代率30%的再生混凝土劈裂抗拉强度达到最大值;铁尾矿砂掺量30%时,再生骨料替代率30%和50%再生混凝土的抗折强度近似呈线性减小。
Abstract: In order to study the effect of iron tailings on the mechanical properties of high ductility recycled concrete, 108 recycled high ductility recycled concrete with 30% and 50% recycled coarse aggregate in 12 groups were tested and studied. The influence of different amount of iron tailings on compressive strength, splitting tensile strength and flexural strength of recycled concrete was analyzed. The results show that the mechanical properties of recycled concrete with recycled coarse aggregate replacement rate of 30% and 50% increase first and then decrease with the increase of iron tailings sand content. The compressive strength, splitting tensile strength and flexural strength of recycled concrete are positively correlated, and reach the peak at 30% iron tailings sand content. When the amount of recycled aggregate is equal, the greater the replacement rate of recycled aggregate, the smaller the compressive strength, and when the content of iron tailing sand is 30%, the splitting tensile strength of recycled concrete with 30% replacement ratio of recycled aggregate reaches the peak. When iron tailings sand content is 30%, the flexural strength of recycled concrete with recycled aggregate replacement rate of 30% and 50% decreases approximately linearly.

关键词:
再生骨料取代率;铁尾矿砂;再生混凝土;力学性能;高延性
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(1)在RAC中掺入定量的PVA纤维后,再生粗骨料替代率为30%和50%RAC试件的力学性能均随铁尾矿砂掺量的增加呈先增长后下降的趋势;其抗压强度、劈裂抗拉强度及抗折强度三者基本呈正相关,均在铁尾矿砂掺量为30%时达到峰值。
(2)当铁尾矿砂掺量相同时,再生骨料替代率越大其抗压强度越小,其中,铁尾矿砂掺量30%时,再生骨料替代率30%RAC试件的抗压强度比再生骨料替代率50%的RAC试件提高了7.14%。
(3)铁尾矿砂掺量为30%时,再生骨料替代率30%RAC试件的劈裂抗拉强度达到最大值,比铁尾矿砂掺量为0、10%、20%试件的劈裂抗拉强度分别提高了41.5%、38.9%、25.6%,但铁尾矿砂掺量大于30%后,劈裂抗拉强度随着铁尾矿砂的掺量增加有所减小。
(4)铁尾矿砂掺量为30%时,再生骨料替代率30%和50%RAC试件的抗折强度相差17.6%,其中,再生骨料替代率30%RAC试件的抗折强度比铁尾矿砂掺量为10%和20%的试件分别提高了44.9%和22.9%;当铁尾矿砂掺量大于30%时,两种再生骨料替代率下RAC试件的抗折强度近似呈线性减小。

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魏涛,全晓旖,闫强强,.高延性铁尾矿砂再生混凝土力学性能试验研究[J].混凝土与水泥制品,2019(8):93-96.

WEI T,QUAN X Y,YAN Q Q,et al.Experimental Study on Mechanical Performance of Ductile Iron Tailings RAC[J].China Concrete and Cement Products,2019(8):93-96.

 

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