混凝土
混凝土
혼응토
CONCRETE
2014年
11期
111-114
,共4页
付新建%张战营%朱孔赞%赵洪义%朱化雨
付新建%張戰營%硃孔讚%趙洪義%硃化雨
부신건%장전영%주공찬%조홍의%주화우
羟丙基甲基纤维素%醚类聚羧酸减水剂%保坍性%缓凝
羥丙基甲基纖維素%醚類聚羧痠減水劑%保坍性%緩凝
간병기갑기섬유소%미류취최산감수제%보담성%완응
propylmethyl cellulose%polyether type polycarboxylate superplasticizer%keeping slump%retarder
以马来酸酐改性羟丙基甲基纤维素（MAHPMC）、丙烯酸及甲基烯丙基聚氧乙烯醚（SPEG2400）为单体，以双氧水-L-抗坏血酸（ASA）氧化还原体系为引发剂，采用免加热低温水溶液共聚法合成羟丙基甲基纤维素改性聚羧酸减水剂。试验结果表明：改性聚醚减水剂PES03，2 h内水泥净浆流动度基本无损失，减水率达30.9%，初凝和终凝时间都延长，增强效果明显。水泥水化热、X射线衍射（XRD）及电子扫描电镜（SEM）试验表明改性聚醚减水剂对水泥水化产物C-S-H、CH及AFt形成有一定延迟作用，改性聚醚减水剂从而表现出明显缓凝及保坍特性。
以馬來痠酐改性羥丙基甲基纖維素（MAHPMC）、丙烯痠及甲基烯丙基聚氧乙烯醚（SPEG2400）為單體，以雙氧水-L-抗壞血痠（ASA）氧化還原體繫為引髮劑，採用免加熱低溫水溶液共聚法閤成羥丙基甲基纖維素改性聚羧痠減水劑。試驗結果錶明：改性聚醚減水劑PES03，2 h內水泥淨漿流動度基本無損失，減水率達30.9%，初凝和終凝時間都延長，增彊效果明顯。水泥水化熱、X射線衍射（XRD）及電子掃描電鏡（SEM）試驗錶明改性聚醚減水劑對水泥水化產物C-S-H、CH及AFt形成有一定延遲作用，改性聚醚減水劑從而錶現齣明顯緩凝及保坍特性。
이마래산항개성간병기갑기섬유소（MAHPMC）、병희산급갑기희병기취양을희미（SPEG2400）위단체，이쌍양수-L-항배혈산（ASA）양화환원체계위인발제，채용면가열저온수용액공취법합성간병기갑기섬유소개성취최산감수제。시험결과표명：개성취미감수제PES03，2 h내수니정장류동도기본무손실，감수솔체30.9%，초응화종응시간도연장，증강효과명현。수니수화열、X사선연사（XRD）급전자소묘전경（SEM）시험표명개성취미감수제대수니수화산물C-S-H、CH급AFt형성유일정연지작용，개성취미감수제종이표현출명현완응급보담특성。
A modified polyether-type superplastizer(PES)was directly polymerized using MAPMC,acrylic acid(AA)and methyl ally polyoxyethylenether(SPEG2400),with H2O2-Ascorbic acid as initiator with low temperature in aqueous media.The results showed that the water-reducing ratio PES03 was 30.9%,the fluidity of cement paste almost remained constant within 2 h ,the setting time of cement on ini-tial and final was prolonged,the enhancement of cement was significant.The experiments of cement hydration heat,X-ray diffraction (XRD)and scanning electron microscopy (SEM)showed that the modified polyether superplasticizer remarkably affects the formation of crystalline ettringite(AFt),portlandite(Ca(OH)2)and calcium silicate hydrate(C-S-H)gel in cement pastes,so the cement of modi-fied polyether superplasticizer showed the characteristics on retarding and keeping slump significantly.
