Mechanical properties of emulsified asphalt rubber concrete
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摘要: 对用乳化沥青(Emulsified asphalt,EA)改善橡胶混凝土(Crumb rubber concrete,CRC)的力学性能进行了研究。通过抗压、抗折、劈裂抗拉和三点弯曲试验,研究了5%、10%和15% 3种橡胶掺量(等体积取代细骨料)下,EA理论计算成膜覆盖橡胶颗粒表面4层、6层和8层膜对应不同EA掺量对CRC力学性能的影响。试验结果发现,对比未预处理CRC和NaOH预处理CRC两个对照组:掺入不同掺量EA后,不同橡胶掺量的CRC的抗压强度和劈裂抗拉强度均有较大提高,CRC的峰值位移显著增大,弯曲弹性模量Eb明显降低;乳化沥青与橡胶质量比为0.15(6层EA膜)时,3种橡胶掺量下CRC较未预处理组相比抗压强度平均提高3.5%,峰值位移提高27.6%,Eb降低21.8%,乳化沥青橡胶混凝土具有较突出的力学性能复合效应。Abstract: The effects of emulsified asphalt (EA) on the mechanical properties of crumb rubber concrete (CRC) were explored. The fine aggregate was replaced with 5%, 10% and 15% rubber by volume in concrete, and different EA contents corresponding to 4, 6 and 8 layers of films covering the surface of rubber particles according to theoretical calculation were studied. The results of compressive strength, flexural strength, splitting tensile strength and three-point bending experiments show that, compared with the unpretreated CRC and NaOH pretreated CRC, the compressive strength and splitting tensile strength of the CRC with different rubber contents are greatly improved by adding different amounts of EA, the peak displacement increases and the flexural elastic modulus Eb decreases significantly; when the mass ratio of emulsified asphalt to rubber is 0.15 (6 layers of EA film), compared with the unpretreated CRC, the average increase in compressive strength is 3.5%, the peak displacement is 27.6%, and Eb is 21.8% lower for CRC at three rubber contents, emulsified asphalt-rubber concrete has a more prominent composite effect of mechanical properties.
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Key words:
- rubber particle /
- concrete /
- emulsified asphalt /
- mechanical properties /
- recycle
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表 1 混凝土配合比
Table 1. Mix proportion of concrete
(kg·m−3) Type Specimen
denotationCement Water Coarse
aggregateFine
aggregateRubber
particlesEmulsified
asphaltPC RC0 450 180 1152.73 622.48 0 — Rubber concrete CRC5 450 180 1152.73 591.36 11.35 — CRC10 450 180 1152.73 560.23 22.70 — CRC15 450 180 1152.73 529.11 34.05 — NaOH treatment NCRC5 450 180 1152.73 591.36 11.35 — NCRC10 450 180 1152.73 560.23 22.70 — NCRC15 450 180 1152.73 529.11 34.05 — EA
treatmentCRC5 A4 450 179.50 1152.73 591.36 11.35 1.14 CRC5 A6 450 179.24 1152.73 591.36 11.35 1.71 CRC5 A8 450 178.99 1152.73 591.36 11.35 2.28 CRC10 A4 450 178.99 1152.73 560.23 22.70 2.28 CRC10 A6 450 178.48 1152.73 560.23 22.70 3.42 CRC10 A8 450 177.98 1152.73 560.23 22.70 4.56 CRC15 A4 450 178.31 1152.73 529.11 34.05 3.42 CRC15 A6 450 177.46 1152.73 529.11 34.05 5.13 CRC15 A8 450 176.62 1152.73 529.11 34.05 6.84 Notes: PC—Plain concrete; (N)CRC5, (N)CRC10, (N)CRC15—Rubber volume substitution ratios of 5%, 10% and 15%, respectively; CRC—Crumb rubber concrete; A4, A6, A8—Layer of emulsified asphalt (EA) of 4, 6 and 8, respectively. 表 2 橡胶混凝土弯曲韧性参数
Table 2. Flexural toughness parameters of crumb rubber concrete
Type Specimen
denotationEb/
GPaIntegral area/
(kN·mm)Peak load/
kNPeak displacement/
mmDeflection of
initial crack/mmPC RC0 3.30 1.960 13.791 0.273 0.239 Rubber
concreteCRC5 2.69 2.118 12.609 0.307 0.269 CRC10 2.35 2.132 11.823 0.326 0.289 CRC15 2.22 2.111 11.695 0.337 0.302 NaOH
treatmentNCRC5 2.63 2.052 12.753 0.320 0.278 NCRC10 2.30 1.997 11.808 0.330 0.290 NCRC15 2.01 2.089 11.623 0.360 0.296 EA
treatmentCRC5 A4 2.52 2.534 13.362 0.351 0.304 CRC5 A6 1.99 2.441 12.071 0.424 0.377 CRC5 A8 1.90 2.452 11.752 0.431 0.385 CRC10 A4 2.17 2.045 11.631 0.350 0.308 CRC10 A6 1.78 2.379 11.596 0.422 0.373 CRC10 A8 1.88 2.416 11.210 0.439 0.398 CRC15 A4 1.90 2.027 10.992 0.354 0.306 CRC15 A6 1.62 2.154 11.056 0.388 0.338 CRC15 A8 1.71 2.484 10.959 0.431 0.368 Note: Eb—Bending modulus of elasticity. -
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