含泥量及成型工艺对疏浚砂水泥基材料力学性能和耐久性的影响  

Influences of Mud Content and Molding Techniques on Mechanical Properties and Durability of Cement-based Materials Prepared with Dredged Sand

作　　者：诸裕良[1,2] 林明泽 陈磊 江朝华 孙建伟[4] ZHU Yu-liang;LIN Ming-ze;CHEN Lei;JIANG Chao-hua;SUN Jian-wei(Engineering Research Center of Ministry of Education on Dredging Technology,Hohai University,Nanjing 210098,China;Yangtze Institute for Conservation and Development,Nanjing 210098,China;Nanjing Yangtze River Management Office,Nanjing 210011,China;Zhaocun Reservoir Management Office,Nanjing 211199,China)

机构地区：[1]河海大学疏浚技术教育部工程研究中心,南京210098 [2]长江保护与绿色发展研究院,南京210098 [3]南京市长江河道管理处,南京210011 [4]南京市江宁区赵村水库管理所,南京211199

出　　处：《长江科学院院报》2023年第2期131-135,共5页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金长江水科学研究联合基金项目(U2040203);国家重点研发计划项目(2021YFB2600200)。

摘　　要：为探索极细疏浚砂资源化利用的有效途径,分别采用振动成型及半干法压制成型方法,以不同含泥量(6.5%~25.8%)的长江下游极细疏浚砂(细度模数0.1~0.3)为主要原料制备水泥基材料替代普通混凝土。研究表明:在振动成型方法下,含泥量的增加对该材料耐久性、力学性能均有不利影响,低含泥量(6.5%)水泥基材料28 d抗压强度和劈裂抗拉强度分别可达35.1 MPa和3.98 MPa,抗冲磨强度和质量损失率分别可达12.5 h/(kg/m^(2))和8.4%;半干法成型方法下,含泥量的增加对水泥基材料强度增长有利,高含泥量(25.8%)水泥基材料28 d抗压、劈裂抗拉强度分别可达37.0 MPa和4.4 MPa,较振动成型方法下分别提高36.5%和25.7%。此外,以振动成型或半干法成型工艺制备的疏浚砂水泥基材料强度可靠,与普通C30混凝土相比,成本可降低33.0%~40.5%,环境友好,具有显著的生态效益。研究成果对于高效、科学、资源化利用长江下游极细疏浚砂有参考价值。To explore an effective way of utilizing fine dredged sand as a replacement of ordinary concrete, cement-based material was prepared by using fine dredged sand with fineness modulus of 0.1-0.3 from the downstream of the Changjiang River as the main raw material. Dredged sand with varied mud content(6.5%-25.8%) was made into cement-based materials by adopting vibration and semi-dry pressing methods, respectively. In the vibration case, the increment of mud content has an adverse impact on the durability and mechanical properties of the tested material. The 28-day compressive strength and splitting tensile strength of cement-based materials with low mud content(6.5%) reached 35.1 MPa and 3.98 MPa, respectively, and the abrasion resistance strength and mass loss rate amounted to 12.5 h/(kg/m^(2)) and 8.4%, respectively. In the semi-dry pressing case, however, the rising of mud content is conducive to the material strength. The 28-day compressive strength and splitting tensile strength of prepared materials with high mud content(25.8%) reached 37.0 MPa and 4.4 MPa, respectively, up by 36.5% and 25.7% respectively compared with those prepared by vibration method. Moreover, preparing cement-based material with vibration or semi-dry pressing molding techniques using dredged sand is environmental-friendly and of notable ecological effect by cutting the costs by 33.0%-40.5% compared with that using ordinary C30 concrete.

关 键 词：长江疏浚砂 水泥基材料 含泥量 工程性能 成型工艺 

分 类 号：U61[交通运输工程—船舶及航道工程]