水性聚合物和化学外加剂协同作用对水泥砂浆强度的影响  

Synergistic interactions between water-soluble polymers and chemical additives on strength development of silicate cement

作　　者：郑娇玲[1] 邵高峰[1] 沈晓冬[1] 

机构地区：[1]南京工业大学材料科学与工程学院材料化学工程国家重点实验室,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2014年第2期14-20,共7页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家重点基础研究发展计划(973计划)(2009CB623100);江苏高校优势学科建设工程;长江学者和创新团队发展计划(IRT1146);江苏省普通高校研究生科研创新计划(CXZZ11_0326)

摘　　要：利用Box-Behnken实验设计(BBD)方法研究水溶性聚合物(聚乙烯醇(PVA)、聚丙烯酰胺(PAM))和化学添加剂(有机硅消泡剂(SD)、聚羧酸减水剂(PC))复配对水泥砂浆抗压强度的影响,得出能反映化学组分掺量与水泥砂浆强度关系的二次方程、化学组分与水泥砂浆强度的帕累托图(Parrot)。结果表明:聚乙烯醇对水泥1 d砂浆强度的贡献最大,随着龄期的增长,作用逐渐减小。聚丙烯酰胺对强度的影响主要体现在28 d,聚羧酸减水剂的作用主要体现在3 d。此外,有机硅消泡剂和聚丙烯酰胺的交互作用存在于整个水化过程中,而有机硅消泡剂和聚羧酸减水剂的交互作用主要体现在3 d前。Influences of water-soluble polymers of polyvinyl alcohol （PVA） and polyacrylamide （PAM）,and chemical additive of silicone defoamer （SD） and polycarboxylate superplasticizer （PC） on the strength development of mortar were investigated by Box-Behnken design （BBD）.The quadratic equations for the correlation between dosages of chemicals and the strength of mortar were obtained,and the orders of effectiveness of chemicals were validated in Pareto charts with contour plots to illustrate chemicals and their interactions for the strength enhancement of mortar.Results showed that PVA made the most contributions to 1 d strength,and the longer the curing time,the weaker the effect.The effects of PAM only appeared in 28 d,and superplasticizer dominated the strength enhancement of mortar in 3 d.Additionally,the interaction effects of SD and PAM enhanced the strength of cement mortar during all the curing time,but the interaction effects of SD and superplasticizer just appeared in the first 3 d.

关 键 词：Box-Behnken实验设计 水性聚合物 化学外加剂 砂浆强度 

分 类 号：TU528.04[建筑科学—建筑技术科学]