粉煤灰改性透水再生混凝土力学性能试验研究-《混凝土与水泥制品》杂志社

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粉煤灰改性透水再生混凝土力学性能试验研究

Experimental Study on Mechanical Properties of Pervious Recycled Concrete Modified by Fly Ash

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关键词：

透水再生混凝土；取代率；超掺系数；水灰比；力学性能

Key words：

Pervious recycled concrete; Replacement ratio; Excessive incorporation coefficient; W/C; Mechanical properties

刊期：

２０19年第1期

DOI：

10.19761/j.1000-4637.2019.01.095.06

文章编号：

基金项目：

住建部科学技术项目（2016-k4-083）；江苏省高校“青蓝工程”优秀骨干教师基金项目；淮安市科技计划基金项目（HAG201606）；固体废弃物再生利用技术重点实验室基金项目（HAP201302）；宿迁市科技项目（M201506）。

作者：

张卫东，王振波

单位：

1.淮阴工学院建筑工程学院，淮安 223001；2.南京工业大学土木工程学院，221009

摘要

摘要：通过改变粉煤灰取代率及超掺系数，研究了粉煤灰对不同水灰比及再生混凝土粗骨料取代率透水再生混凝土力学性能的影响。结果表明，粉煤灰等量取代水泥的透水再生混凝土立方体抗压强度、抗折强度及折压比均低于基准透水再生混凝土；当粉煤灰超量取代水泥时，粉煤灰取代率低于20%时的立方体抗压强度、抗折强度及折压比均随超量系数增加而增大，但超量系数超过1.4后效果不明显；粉煤灰取代率为30%时，不同粉煤灰超量系数下力学性能均低于基准试验值；随着再生混凝土粗骨料取代率或水灰比的增大，立方体抗压强度、抗折强度及折压比均随之下降，相同水灰比或再生混凝土粗骨料取代率时，立方体抗压强度、抗折强度及折压比均随粉煤灰超量系数增大而增大，但超量系数超过1.4后效果同样不明显。

Abstract: Through changing the replacement ratio and excessive incorporation coefficient of fly ash, the effect of fly ash on the mechanical properties of the pervious recycled concrete with different W/C and the replacement ratio of recycled aggregate is studied, and the optimal replacement ratio of fly ash and excess incorporation coefficient are determined. The results show that the cubic compressive strength, flexural strength, and the ratio of flexural strength to compressive strength of pervious recycled concrete with equal amounts of fly ash to replace cement are all lower than those of normal pervious recycled concrete; when the fly ash corctent is over and the replacement ratio of fly ash is lower than 20%, the cubic compressive strength, flexural strength and the ratio of flexural strength to compressive strength increase with the increase of the excessive incorporation coefficient, but the effect is not obvious after the excessive incorporation coefficient exceeds 1.4; When the replacement ratio of fly ash is 30%, the mechanical properties of different fly ash exceesive incorporation coefficients are lower than the benchmark value, so it is recommended that the replacement ratio of fly ash should not exceed 20%. With the increase of the replacement ratio of recycled concrete aggregates or the W/C, the cubic compressive strength, flexural strength and the ratio of flexural strength to compressive strength all decrease. Under the same W/C or the replacement ratio of recycled concrete aggregates, the cubic compressive strength, flexural strength, and the ratio of flexural strength to compressive strength all increase with the increase of the fly ash excessive incorporation coefficient, but the effect is not also obvious after the excessive incorporation coefficient exceeds 1.4.

结论

（1）立方体抗压强度、抗折强度及折压比均随粉煤灰取代率及再生混凝土粗骨料取代率的增大而下降，且影响趋势与粉煤灰超量系数关系不大。

（2）水灰比对透水再生混凝土力学性能的影响与其对普通混凝土力学性能影响情况较为类似，即随着水灰比的增大，立方体抗压强度、抗折强度及折压比均呈下降趋势。

（3）不同粉煤灰取代率（≤20%）、再生混凝土粗骨料取代率及水灰比下，立方体抗压强度、抗折强度及折压比均随粉煤灰超量系数的增大而增大，但后期较为缓慢；粉煤灰取代率为30%时，立方体抗压强度、抗折强度及折压比均随粉煤灰超量系数的增大呈先增长后轻微下降的趋势。

（4）粉煤灰超量取代水泥可获得与基准透水再生混凝土相同的力学性能，但需严格控制相关指标，建议粉煤灰取代率不超过20%，超量系数不超过1.4。

（5）不同影响因素下，透水再生混凝土立方体抗压强度与抗折强度间具有一定的相关性，相互间的关系可用幂函数表示。

参考文献

[1] Yang J, Jiamg G.Experimental study on properties of pervious concrete pavement materials[J]. Cement and Concrete Research,2003,33(3):381-386.

[2] Luck J D, Workman S R, Coyne M S, et al.Solid material retention and nutrient reduction properties of pervious concrete mixtures[J].Biosystems Engineering,2008,100(3):401-408.

[3] Weng Q, Lu D, Schubring J.Estimation of land surface tem perature-vegetation abundance relationship for urban heat island studies[J]. Remote Sensing of Environment,2004,89(4):467-483.

[4] Cui Y,Gary P,Lisle T E,et al.Experimental study on proper ties of pervious concrete pavement materials[J]. Cement & Concrete Research,2003,33(3):381-386.

[5] Maniarasan S K,Nandhini V,Kavom G,et al.Study on charac terization of pervious concrete for pavements[J]. International Journal of Research in Engineering and Applied Sciences,2015(4):81-97.

[6] Güneyisi E, Gesoglu M, Kareem Q,et al.Effect of different substitution of natural aggregate by recycled aggregate on performance characteristics of pervious concrete[J].Materials and Structures,2016,49(1-2):521-536.

[7] Chindaprasirt P,Nualpmg P,Zaetang Y,et al.Mechanical and thermal properties of recycling lightweight pervious concrete[J]. Arabian Journal for Science and Engineering,2015(2):443-450.

[8] Sata V,Ngohpok C,Chinaprasirt P.Properties of pervious concrete containing high-calcium fly ash[J]. Computers and Concrete,2016,17(3):337-351.

[9] Zaetang Y,Sata V,Wongsa A,et al.Properties of pervious concrete containing recycled concrete block aggregate and recycled concrete aggregate[J].Construction and Building Materials,2016,111:15-21.

[10] 苏有文,廖若寒,周良峥,等.聚合物改善透水混凝土性能试验研究[J].混凝土与水泥制品,2018(6):7-10,34.

[11] 赵顺波,夏铭,刘春杰.人工砂粉煤灰混凝土基本力学性能试验研究[J].铁道科学与工程学报,2006(2):15-20.

[12] 李子成,张爱菊,隋修志,等.透水混凝土界面增强增韧效应研究[J].硅酸盐通报,2017,36(2):747-752.

引用本文

张卫东,王振波.粉煤灰改性透水再生混凝土力学性能试验研究[J].混凝土与水泥制品,2019(1):95-100.

ZHANG W D,WANG Z B.Experimental Study on Mechanical Properties of Pervious Recycled Concrete Modified by Fly Ash[J].China Concrete and Cement Products,2019(1):95-100.

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