植生混凝土基质碱性优化及强度性能研究  

Alkaline Optimization and Strength Performance of Vegetated Concrete Matrix

作　　者：张宏峰 赵玉如 张伟强 赵飞 李怡君 李敏 ZHANG Hongfeng;ZHAO Yuru;ZHANG Weiqiang;ZHAO Fei;LI Yijun;LI Min(Henan Scientific Research Platform Service Center,Zhengzhou 450003,China;School of Civil Engineering,Henan Institute of Engineering,Zhengzhou 451191,China)

机构地区：[1]河南省科研平台服务中心,郑州450003 [2]河南工程学院土木工程学院,郑州451191

出　　处：《河南科学》2023年第12期1783-1789,共7页Henan Science

基　　金：河南省重大公益性科技专项(201300311500);河南省科技攻关计划项目(212102310290)。

摘　　要：为改善植生混凝基质的碱性,提高植生混凝土的抗压强度.通过室内试验方法,分别研究混凝土掺合料、弱酸处理液对植生混凝土碱性优化的影响,并结合单轴压缩试验探究其强度变化规律,在此基础上利用工程实践提出植生混凝土降碱增强措施.研究结果表明,相较于硅灰,粉煤灰对植生混凝土骨料胶结促进作用更强,4种掺合量下粉煤灰试样强度明显高于硅灰,但两种掺合料均不能有效改善混凝土的碱性;同时,随着两种掺合料含量的增加,混凝土强度和孔隙率均呈现先增大后降低趋势;三种弱酸溶液均能显著降低植生混混凝土试样基质的碱性,其中CuSO_(4)溶液降碱效果最好,最大可降低试样基质pH值的25%左右,但试样基质碱性的中和劣化了骨料间的胶结特性,降低了试样的强度.因此,利用植生混凝土护坡时需平衡其碱性和强度,选择合适掺料和弱酸溶液.In order to improve the alkalinity of vegetated concrete matrix and increase the compressive strength of vegetated concrete.In this paper,the influence of concrete admixture,acid treatment solution on the alkalinity of vegetated concrete is studied by indoor test method,and the strength variation law of vegetated concrete is studied by uniaxial compression test,on this basis,the measures of reducing alkalinity and strengthening vegetated concrete are put forward by engineering practice.The results show that,compared with silica fume,fly ash has a stronger effect on the cementation of concrete aggregates,and the strength of fly ash samples is obviously higher than that of silica fume at four different dosages,but two kinds of admixtures can not effectively improve the alkalinity of concrete.At the same time,with the increase of the content of the two kinds of admixtures,the strength and porosity of the concrete increase at first and then decrease.Three kinds of weak acid solutions can significantly reduce the alkalinity of vegetated concrete matrix.Among them,CuSO_(4) solution has the best alkali-reducing effect,and can reduce the pH value of the matrix by about 25%,but the basic neutralization of the matrix degrades the bonding property of the aggregate and reduces the strength of the sample.So,it is necessary to balance the alkalinity and strength of vegetated concrete in slope protection,and to select suitable admixture and weak acid solution.

关 键 词：植生混凝土 强度 碱性 掺合料 弱酸溶液 

分 类 号：TV431[水利工程—水工结构工程]