高吸水树脂内养护混凝土的氯离子渗透及碳化性能  

Chloride Ion Invasion and Carbonation Property of Internal Cured Concrete with Super-absorbent Polymer

作　　者：张力冉 孔祥明[2] 邢锋[1] 付孝谌[2] 董必钦 ZHANG Liran;KONG Xiangming;XING Feng;FU Xiaochen;DONG Biqin(College of Civil Engineering,Shenzhen University,Shenzhen 518060,China;Department of Civil Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]深圳大学土木工程学院,广东深圳518060 [2]清华大学土木工程系,北京100084

出　　处：《河南科技大学学报（自然科学版）》2019年第1期60-65,109,110,共8页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家重点研发计划基金项目(2017YFB0310000);国家自然科学基金面上项目(U1301241)

摘　　要：针对高吸水树脂(SAP)影响混凝土的渗透性及耐久性的问题,通过测试盐水浸泡-干燥循环条件下混凝土中氯离子含量、加速碳化条件下碳化深度,研究了预吸水SAP凝胶颗粒、预吸1%(质量分数)硝酸银溶液的SAP凝胶颗粒对混凝土氯离子渗透及碳化性能的影响规律。研究结果表明:在干湿循环条件下,混凝土中的SAP与SAP-Ag颗粒分别起到了"水泵"与"氯泵"的作用,加速了Cl^-在混凝土中的积累和传输,对海工环境下混凝土的抗氯离子侵蚀能力有负面作用。但适量掺加SAP或SAP-Ag颗粒,由于其吸湿膨胀封堵孔隙的作用,阻塞了CO_2的扩散路径,一定程度上提高了混凝土的抗碳化能力。In view of the influence of superabsorbent polymer(SAP)on the permeability and durability of concrete,in this paper,by testing the content of chloride ions in concrete under salt water immersion-drying cycle and the carbonation depth under accelerated carbonation conditions,water pre-soaked SAP and 1%AgNO 3 solution pre-soaked SAP gel-particles as internal curing agents were employed to investigate their effects on chloride ion invasion and carbonation property of the resulted concrete specimens.Experiment results show that SAP and SAP-Ag particles play a role of“water pump”and“chloride ion pump”in concrete under the wet-dry cycle treatment to accelerate the accumulation and transport of Cl-in concrete,respectively.That is to say,SAP internal curing agent has a negative effect on the resistance of concrete to chloride ion erosion under marine environment.On the other hand,it is found that by adding appropriate amount of SAP or SAP-Ag gel-particles,the capillary pores of concrete can be plugged to reduce the diffusion path of CO 2 after the SAP gel-particles are swollen by moisture absorption,so that the carbonation resistance of concrete is improved to some extent.

关 键 词：高吸水树脂 混凝土 氯离子渗透 抗碳化 

分 类 号：TU528.0[建筑科学—建筑技术科学]