摘要
【目的】植生混凝土常常用于生态护坡,其抗压性能和碱度极大地影响护坡防护能力和植生性能,目前就相关参数影响的对比分析仍较少。【方法】通过汇总相关文献结果并进行对比分析,探究了水胶比、掺合料、骨胶比、骨料粒径和水泥类型对植生混凝土抗压强度的影响规律,探讨了掺加掺合料、表面碳化、低碱水泥替代、化学溶液喷涂或浸泡对植生混凝土的降碱效果。【结果】结果显示:掺加一定量矿物掺合料和采用不同类型水泥均对植生混凝土的抗压强度影响较小,而水胶比、骨胶比和骨料粒径对强度影响较大。掺加矿物掺合料的降碱效果有限,而采用硫铝酸盐水泥、快速碳化处理、弱酸性磷酸盐溶液或草酸溶液处理的降碱效果较好,且基本不损失抗压强度。【结论】结果表明:植生混凝土适宜的配合比参数可取为水胶比0.30~0.35、骨胶比4.8~5.5、骨料粒径10~26.5 mm,采用单一或复合措施降碱可使混凝土碱度满足植生要求。建议发展配合比和复合降碱措施的协同优化技术,实现植生混凝土抗压强度和碱度综合调控。
[Objective]Panted concrete is usually used in the ecological slope.The compressive property and alkalinity of planted concrete have a great effect on the protection capacity of slope and the vegetation performance.However,the comparative analysis of the effect of the related parameters is still limited currently.[Methods]In this paper,the result reported in related references are collated and compared to analyze the effect of porosity,water cement ratio,admixture,aggregate cement ratio,aggregate particle size and cement type on the compressive strength of vegetation concrete.And the alkali-reducing capacity of adding admixtures,surface carbonization,low-alkali cement replacement,chemical solution spraying or soaking is discussed.[Results]The result indicate that the addition of a certain amount of mineral admixture,as well as the use of different types of cement,has lower effect on the compressive strength of planted concrete,whereas the water-cement ratio,aggregate-cement ratio and aggregate size show an apparent effect.The addition of mineral admixture has a limited effect on the reduction in pH value of planted concrete,while the alkali reducing effectiveness is apparent with use of sulphoaluminate cement(SAC),rapid carbonization treatment,and weak acid phosphate solution or oxalic acid solution treatment,accompanied by no loss in compressive strength.[Conclusion]The appropriate parameters for mixture proportion of planted concrete can be taken as water-binder ratio of 0.30~0.35,aggregate-cement ratio of 4.8~5.5,and aggregate particle size of 10~26.5 mm.The alkalinity for plant growing can be satisfied with use of the single or compound alkali reduction measures.It is suggested to develop the collaborative optimization technique of mixture proportion and composite alkali reduction method in order to obtain a comprehensive control of compressive strength and alkalinity of the planting concrete.
作者
杨善印
侯利军
吉庆伟
野博超
YANG Shanyin;HOU Lijun;JI Qingwei;YE Bochao(Key Laboratory of Ministry of Education for Coastal Disaster and Protection,HoHai University,Nanjing 210098,Jiangsu,China;Luoyun Hydraulic Engineering Management Division of Jiangsu Province,Suqian 223800,Jiangsu,China)
出处
《水利水电技术（中英文）》
北大核心
2023年第6期202-211,共10页
Water Resources and Hydropower Engineering
基金
江苏省水利科技项目(2020016)
中国长江三峡集团有限公司科技项目(202103320)。
关键词
植生混凝土
抗压性能
降碱技术
孔隙率
水胶比
vegetation concrete
compressive strength
alkali reduction technology
porosity
water-binder ratio
