( 4 ) the neat cement paste fluidity of copolymer would augment and the cohesiveness of cement would increase along with augmentation of pea dosage , but if the dosage was too big , the dosage of aa would be reduced , so it would reduce the carboxylic content of copolymer , and performance of water reduce would weaken , the dosage of pea23 can not more than 25 % . ( 5 ) the effect of water reduce would increase if the copolymer time increase 而與x40 ;比較,減水率、凝結時間、保坍性、抗壓強度比等綜合性能還有一定的差距,有待進一步的改進和研究。從合成pc23一6的工業性分析: pea23的酷化和pc23一6的共聚的放大試驗看,其混凝土試驗結果較為理想,且其合成工藝流程較為簡單,具備高分子的合成條件:而從經濟性分析, 30 % pc23一6水溶液的原料成本低于fdn ,其性能具有較大的優勢,具有廣闊的工業化的前景。
The preparation of chain transfer , the mol percent of pea : aa : mma and the time of combind were systermic investigated . the performance of pc was refledted by the neat cement paste fluidity and fluidity losing . the results indicated : ( 1 ) the preparation of chain transfer was one of most factor of control the molecular weight of copolymer and influence the performance of pc 通過測定減水劑的水泥凈漿流動度及流動度損失宏觀反映合成減水劑共聚體pc的性能,研究結果表明: ( 1 )鏈轉移劑是控制共聚物分子量影響共聚體pc性能的主要因素之一,在選擇鏈轉移劑zy 、用量為8 aa時的作用效果最佳。
The main content is : splitting tensile experiments were carried out about the standardized cube bonding specimens ( 150x 150x 150mm3 ) of the new - old concrete after high temperature . the temperature is divided into 9 groups from normal atmospheric temperature to 900 , the cooling styles are natural cooling and spraying water cooling ; different interfacial treating methods : brushed with steel - wire brush , man - made chiseling ( not evenly ) , man - made chiseling ( quite evenly ) ; different interfacial agents : no interfacial agent , neat cement paste , cement paste mixed with 10 % expanding agent 主要內容有:本文對75個高溫作用后的標準立方體新老混凝土粘結試件進行了劈拉試驗,溫度從常溫到900c分9個溫度段,降溫方式分自然冷卻和噴水冷卻兩種。著重考察了溫度、降溫方式、界面粗糙度及界面劑對新老混凝土粘結劈拉強度的影響規律,闡述了高溫后粘結強度下降的機理。
( 2 ) interfacial agents this experiment adopts three types of interfacial agents : no interfacial agent , neat cement paste which has the same water - cement ratio with the new concrete , cement paste mixed with 10 % expanding agent which has the same ratio with the new concrete ( which is called cement paste mixed with expanding agent for short ) . the thickness of the interfacial agent is 2 ~ 3mm ( 2 )粘結劑本試驗采用三種粘結劑:無粘結劑、同新混凝土相同水灰比的水泥凈漿、摻10 u型膨脹劑的同新混凝土相同水灰比的水泥凈漿(以下簡稱水泥膨漿) 。界面劑的厚度一般為2 3mm 。