混凝土
混凝土
혼응토
CONCRETE
2014年
2期
64-67
,共4页
冯中军%孔凡桃%邓最亮%傅乐峰%俞明辉
馮中軍%孔凡桃%鄧最亮%傅樂峰%俞明輝
풍중군%공범도%산최량%부악봉%유명휘
酰胺型%聚羧酸%减水剂%高减水率%坍落度保持%外加剂
酰胺型%聚羧痠%減水劑%高減水率%坍落度保持%外加劑
선알형%취최산%감수제%고감수솔%담락도보지%외가제
amide type%polycarboxylic acid%water reducer%high water-reducing rate%slump-retaining%admixture
制备了一种酰胺型聚羧酸系减水剂,研究了主链分子量、主链组成以及侧链接枝密度对其减水保坍性能的影响,通过FTIR、GPC对其结构进行了表征,最后与聚羧酸醚(AA/HPEG共聚物)、聚羧酸酯(MAA/MPEGMA共聚物)等两类聚羧酸系减水剂进行了性能对比。结果表明:主链分子量约4000、主链组成是摩尔比AA/MAA=3∶1的共聚物、侧链接枝密度为20%的酰胺型聚羧酸系减水剂综合性能最好,其混凝土减水率、坍落度保持和抗压强度等性能均优于聚羧酸醚和聚羧酸酯两类减水剂。
製備瞭一種酰胺型聚羧痠繫減水劑,研究瞭主鏈分子量、主鏈組成以及側鏈接枝密度對其減水保坍性能的影響,通過FTIR、GPC對其結構進行瞭錶徵,最後與聚羧痠醚(AA/HPEG共聚物)、聚羧痠酯(MAA/MPEGMA共聚物)等兩類聚羧痠繫減水劑進行瞭性能對比。結果錶明:主鏈分子量約4000、主鏈組成是摩爾比AA/MAA=3∶1的共聚物、側鏈接枝密度為20%的酰胺型聚羧痠繫減水劑綜閤性能最好,其混凝土減水率、坍落度保持和抗壓彊度等性能均優于聚羧痠醚和聚羧痠酯兩類減水劑。
제비료일충선알형취최산계감수제,연구료주련분자량、주련조성이급측련접지밀도대기감수보담성능적영향,통과FTIR、GPC대기결구진행료표정,최후여취최산미(AA/HPEG공취물)、취최산지(MAA/MPEGMA공취물)등량류취최산계감수제진행료성능대비。결과표명:주련분자량약4000、주련조성시마이비AA/MAA=3∶1적공취물、측련접지밀도위20%적선알형취최산계감수제종합성능최호,기혼응토감수솔、담락도보지화항압강도등성능균우우취최산미화취최산지량류감수제。
An amide type polycarboxylate superplasticizer was synthesized.The effect of main-chain molecule weight ,the components of backbone and the grafting density of side chain on the ability of water reduction and slump loss resistant property were investigated.The structure of amide type polycarboxylate superplasticizer was characterized by fourier transform infrared spectroscopy (FTIR) and gel per-meation chromatography(GPC).Finally,the comparison was made on the performance of the synthetic amide type polycarboxylate su-perplasticizer,polyether type polycarboxylate superplasticizer(AA/HPEG copolymer) and polyeste type polycarboxylate superplasticizer (MAA/MPEGMA copolymer).The result showed that the synthetic amide type polycarboxylate superplasticizer had the best comprehen-sive performance when the main-chain molecule weight was about 4 000,the molar ratio of acrylic acid(AA) to methacrylic acid(MAA) of backbone was 3∶1 and the grafted side chain density was 20%.Meanwhile,this amide type polycarboxylate superplasticizer had a better per-formance on water-reducing rate,slump-retaining ability and compressive strength for concrete compare with the polyether type and polyester type polycarboxylate water reducer.