陶砂对3D打印砂浆的可打印性与早期水化行为的影响
陈传峰，刘晨曦，苗 苗，付 强，冯竟竟*
（山东农业大学，山东 泰安 271018）
摘 要 利用陶砂取代一定体积的河砂制备3D打印砂浆，并对砂浆的可打印性、早期水化进程以及骨料与胶凝材料之间的界面结合区进行研究。研究结果表明：陶砂的掺入能够提高砂浆的流动性，延长砂浆的凝结时间，陶砂砂浆适宜打印的流动性在170~200 mm之间，初凝时间处于45~60 min之间，砂浆具有良好的可打印性；陶砂体积替代量在30%以内时，陶砂的掺入能够促进砂浆早期的水化，陶砂体积替代量越大，砂浆早期水化速率越快；在SEM下利用EDXA对7d、28d龄期砂浆内骨料与胶凝材料的界面结合区CaO/SiO2进行分析，进而间接表明界面结合区的厚度，研究发现在7d、28d龄期时陶砂与胶凝材料界面结合区的厚度分别比河砂与胶凝材料界面结合区的厚度厚25%、30.7%。
关键词 3D打印；陶砂砂浆；可打印性；水化进程；微观形貌
中图分类号：TU528;TU502；TG115. 21 + 5.3 文献标识码：A doi:10.3969/j.issn.1000-6281.2022.02.005
Effect of ceramic sand on printability and early hydration behavior of 3D printed mortar
CHEN Chuan-feng，LIU Chen-xi，MIAO Miao，FU Qiang，FENG Jing-jing*
（Shandong Agricultural University, Taian Shandong 271018，China）
Abstract 3D printed mortar was prepared by using ceramic sand instead of river sand, and its printability, early hydration process and interface bonding zone between aggregate and cementite were studied. The results show that the mixing of ceramic sand can improve the fluidity of mortar, prolong the setting time of mortar, the suitable printing fluidity of ceramic sand mortar is between 170~200 mm, the initial setting time is between 45~60 min; When the volume replacement amount of pottery sand is less than 30%, the addition of pottery sand can promote the early hydration of mortar. The higher the volume replacement amount of pottery sand is, the faster the early hydration rate of mortar is. Under SEM, EDXA was used to analyze CaO/SiO2 of interface bonding zone between aggregate and cemetitous material in 7d and 28d age mortar, thus indirectly indicating the thickness of interface bonding zone. It is found that the thickness of the interfacial bonding zone between pottery sand and cementitious material is 25% and 30.7% thicker than that of river sand and cementitious material at the age of 7 and 28 days, respectively.
Keywords 3D printing; Ceramic mortar; Working performance; Hydration behavior；microstructure
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[1] 常西栋，李维红，王乾. 3D打印混凝土材料及性能测试研究进展[J]. 硅酸盐通报，2019，38(8): 2435-2441.
[2] 张大旺，王栋民. 3D打印混凝土材料及混凝土建筑技术进展[J]. 硅酸盐通报，2015，34(6): 1583-1588.
[3]丁烈云，徐捷，覃亚伟. 建筑3D打印数字建造技术研究应用综述[J]. 土木工程与管理学报，2015，32(3): 1-10.
[4] LIM S, BUSWELL R A，VALENTINE P J，et al. Modelling curved-layered printing paths for fabricating large-scale construction components [J]. Additive Manufacturing，2016, 12: 216-230.
[5] GOSSELIN C，DUBALLET R，ROUX P, et al. 3D printing of ultra-high performance concrete-a new processing route for architects and builders [J]. Materials and Design，2016, 100(6): 102-109.
[6] PERROT A, RANGEARD D, PIERRE A. Structural built-up of cement-based materials used for 3D-printing extrusion techniques [J]. Materials and Structures，2016，49(4) : 1-8．
[7] ZHANG G，LI G，LI Y. Effects of superplasticizers and retarders on the fluidity and strength of sulphoaluminate cement [J]. Construction and Building Materials，2016, 126: 44-54．
[8] 陈旭鹏，庞建勇. 不同腐蚀性离子对掺合料混凝土性能及微观形貌的影响[J]. 电子显微学报，2021，40(3):251-256.
[9] MA G W，LI Z J，WANG L. Printable properties of cementitious material containing copper tailings for extrusion based 3D printing [J]. Construction and Building Materials，2018，162: 613-627．
[10] 李维红，常西栋，王乾，等. 速凝3D打印水泥基材料的制备[J]. 功能材料，2020，51(5): 5148-5153.
[11] 霍亮，蔺喜强，李小龙，等. 基于沙漠砂的3D打印砂浆性能研究及应用[J]. 混凝土，2020(12): 108-110+117.
[12] 雷毅. 水泥混凝土路面快速修补用聚合物改性水泥基材料的研究[D]. 长沙：湖南大学，2014.
[13] 李进辉. 高性能轻集料混凝土性能影响因素的研究[D]. 武汉：武汉理工大学, 2008.
[14] 孔德玉，单玉川，薛思滔，等. 再生骨料原位强化研究[J]. 电子显微学报，2015，34(6):470-475.
[15] 董龙瑞，杭美艳，武俊清，等. 风积沙微粉水泥胶砂水化机理研究[J]. 电子显微学报，2020，39(2):134-140.
[16] 马国伟，柴艳龙，王里，等. 3D打印陶砂轻质混凝土的制备与力学性能测试[J]. 实验力学, 2020, 35(1): 58-66.
[17] 陈传峰，刘晨曦，李思琪，等. 陶砂对3D打印砂浆力学与微观性能的影响[J]. 混凝土与水泥制品, 2022(1): 7-11.
[18] 柴艳龙. 3D打印陶粒混凝土制备与物理力学性能研究[D]. 天津：河北工业大学，2019.
[19] 梁苗苗. 低水胶比水泥基胶凝材料的收缩性能研究[D]. 重庆：重庆交通大学，2020.
[20] 徐晶，王彬彬. 浆/集界面纳米改性的多尺度力学表征[J]. 电子显微学报，2015，34(6):492-497.
[21] 彭宇，赵国荣，王培铭，等. 基于Ca(OH)2形貌的可再分散乳胶粉延迟水泥水化的研究[J]. 电子显微学报，2016，35(6):490-495.
[22] ROSSIGNOLO J A. Effect of silica fume and SBR latex on the pasteaggregate interfacial transition zone [J]. Materials Research，2007，10(1):83-86.
