CAJ | 학술논문

为了研究聚羧酸系减水剂(PCA)分子结构中疏水侧链对新拌混凝土坍落度及其损失的影响，以马来酸酐(MA)、异戊烯醇聚氧乙烯醚(TPEG)和丙烯酸烷基酯为原料，过硫酸铵为引发剂，通过自由基聚合合成了4种不同疏水侧链长度(疏水侧链含碳个数分别为4、8、12和18)的聚羧酸系减水剂。通过水泥净浆流动度、流动性损失等指标检验了聚羧酸系减水剂的分散性能及保坍性能，结果表明随着疏水侧链长度的增加，聚羧酸系减水剂的分散性能逐渐提高，保坍性能有所改善。吸附量和zeta电位测试结果解释了这种现象的原因，随着疏水侧链长度的增加，水泥颗粒表面zeta电位绝对值逐渐增加，水泥颗粒表面上的持续吸附能力逐渐增强。
위료연구취최산계감수제(PCA)분자결구중소수측련대신반혼응토담락도급기손실적영향，이마래산항(MA)、이무희순취양을희미(TPEG)화병희산완기지위원료，과류산안위인발제，통과자유기취합합성료4충불동소수측련장도(소수측련함탄개수분별위4、8、12화18)적취최산계감수제。통과수니정장류동도、류동성손실등지표검험료취최산계감수제적분산성능급보담성능，결과표명수착소수측련장도적증가，취최산계감수제적분산성능축점제고，보담성능유소개선。흡부량화zeta전위측시결과해석료저충현상적원인，수착소수측련장도적증가，수니과립표면zeta전위절대치축점증가，수니과립표면상적지속흡부능력축점증강。
In order to study how the hydrophobic side chain in polycarboxylate superplasticizer structure affect the slump loss of the fresh concrete,four polycarboxylate superplasticizer (PCA)with different hydrophobic side chain length were synthesized by free radical copolymerization of maleic anhydride (MAH),methallyl alco-hol polyethylene oxide ether (TPEG)and acrylic alkyl ester using ammonium persulfate [(NH4 )2 SO4 ,APS]as initiator.The dispersing and flow retention performance of the four PCA was investigated respectively by tes-ting the fluidity of cement paste.The adsorption mechanism of NPC was discussed by testing the adsorption amount and zeta potential.The fluidities and flow loss of cement paste show that the dispersing performance of PCA gradually improves with the increase of the hydrophobic side chain length.The results of the zeta potential and the continuous adsorption ability of PCA on the surface of cement particles gradually increase with increas-ing the length of the hydrophobic side chain.