再生黏土砖骨料混凝土配合比参数对性能的影响研究
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摘要
使用废弃黏土砖完全替代天然砂和石子制备全再生混凝土,探究了水胶比、水泥用量、粉煤灰和硅灰取代率对再生混凝土性能的影响。结果表明:降低水胶比和增加水泥用量都能够提升砖骨料混凝土抗压强度、降低含水率和增加干表观密度,但对抗压强度的提升存在上限;粉煤灰虽然具有火山灰活性,但作用发挥较慢,掺加会降低28 d前的力学性能和干表观密度。硅灰的加入会明显提升净浆黏聚性,提升力学性能。
The recycled concrete was prepared by using waste clay bricks as coarse and fine aggregates. The influence of water-binder ratio, cement dosage, fly ash and silica fume content on properties of recycled concrete was studied. The results show that with the decrease of water-cement ratio or the increase of cement dosage, the compressive strength and dry apparent density of recycled concrete increase, meanwhile the moisture content decreases. But there is an upper limit on the compressive strength. Since the pozzolanic activity of fly ash plays slower, the addition of fly ash could reduce the compressive strength and dry apparent density of recycled concrete before 28 d. The use of silica fume could improve the cohesiveness of paste obviously, therefore, the compressive strength of recycled concrete is improved.
The recycled concrete was prepared by using waste clay bricks as coarse and fine aggregates. The influence of water-binder ratio, cement dosage, fly ash and silica fume content on properties of recycled concrete was studied. The results show that with the decrease of water-cement ratio or the increase of cement dosage, the compressive strength and dry apparent density of recycled concrete increase, meanwhile the moisture content decreases. But there is an upper limit on the compressive strength. Since the pozzolanic activity of fly ash plays slower, the addition of fly ash could reduce the compressive strength and dry apparent density of recycled concrete before 28 d. The use of silica fume could improve the cohesiveness of paste obviously, therefore, the compressive strength of recycled concrete is improved.
引文
[1]艾红梅,燕芳,韩立东,等.废弃黏土砖资源化利用的研究进展[J].建材技术与应用,2012(4):11-13.
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[4]Zhi Ge,Yuanyuan Wang.Influence of ground waste clay brick on properties of fresh and hardened concrete[J].Construction and Building Materials,2015,98(15):128-136.
[5]徐勇,邵荣丹.废弃黏土砖的回收再利用[J].耐火材料,2013(4):291-293.
[6]Debieb F,Kenai S.The use of coarse and fine crushed bricks as aggregate in concrete[J].Construction and Building Materials,2008,22(5):886-893.
[7]Cachim P.B.Mechanical properties of brick aggregate concrete[J].Construction and Building Materials,2009,23(3):1292-1297.
[8]赵亚松,高建明.废弃黏土砖轻骨料混凝土的力学性能研究[J].混凝土与水泥制品,2018(5):91-95.
[9]朋改非,黄艳竹,张九峰.骨料缺陷对再生混凝土力学性能的影响[J].建筑材料学报,2012,15(1):80-84.
[10]潘丽云,陈梅华,沈泽,等.钢纤维全轻骨料粉煤灰混凝土的配合比和性能研究[J].华北水利水电大学学报:自然科学版,2015(6):32-35.
[11]潘荣伟,徐伟,陈益兰,等.复合胶凝材料对轻集料混凝土力学性能影响研究[J].混凝土,2012(11):64-66,70.
[12]王洪,陈伟天,陈昌礼.硅灰对高强混凝土强度影响的试验研究[J].混凝土,2011,23(7):74-76.
[2]张孟雄,张学良,王卫秋,等.建筑垃圾砖的开发及应用[J].砖瓦世界,2006(8):19-21.
[3]Boukour S,Benmalek M.L.Performance evaluation of a resinous cement mortar modified with crushed clay brick and tire rubber aggregate[J].Construction and Building Materials,2016,120(1):473-481.
[4]Zhi Ge,Yuanyuan Wang.Influence of ground waste clay brick on properties of fresh and hardened concrete[J].Construction and Building Materials,2015,98(15):128-136.
[5]徐勇,邵荣丹.废弃黏土砖的回收再利用[J].耐火材料,2013(4):291-293.
[6]Debieb F,Kenai S.The use of coarse and fine crushed bricks as aggregate in concrete[J].Construction and Building Materials,2008,22(5):886-893.
[7]Cachim P.B.Mechanical properties of brick aggregate concrete[J].Construction and Building Materials,2009,23(3):1292-1297.
[8]赵亚松,高建明.废弃黏土砖轻骨料混凝土的力学性能研究[J].混凝土与水泥制品,2018(5):91-95.
[9]朋改非,黄艳竹,张九峰.骨料缺陷对再生混凝土力学性能的影响[J].建筑材料学报,2012,15(1):80-84.
[10]潘丽云,陈梅华,沈泽,等.钢纤维全轻骨料粉煤灰混凝土的配合比和性能研究[J].华北水利水电大学学报:自然科学版,2015(6):32-35.
[11]潘荣伟,徐伟,陈益兰,等.复合胶凝材料对轻集料混凝土力学性能影响研究[J].混凝土,2012(11):64-66,70.
[12]王洪,陈伟天,陈昌礼.硅灰对高强混凝土强度影响的试验研究[J].混凝土,2011,23(7):74-76.