混凝土与水泥制品
混凝土與水泥製品
혼응토여수니제품
China Concrete and Cement Products
2015年
9期
1-5
,共5页
扩链剂%聚羧酸系%高性能减水剂%改性%分散性%多功能
擴鏈劑%聚羧痠繫%高性能減水劑%改性%分散性%多功能
확련제%취최산계%고성능감수제%개성%분산성%다공능
Chain extender%Polycarboxylic%High performance water reducer%Modification%Dispersiveness%Multi-function
对四种聚羧酸系高性能减水剂进行了扩链剂改性研究,并优化出最佳改性工艺。结果表明,改性后的聚羧酸系高性能减水剂A对水泥的分散性能仅起到抵消缓释作用,B、C、D对水泥的分散性能有很大的提高,尤其是对保坍性能较差的减水剂；改性后的减水剂对混凝土的流变性能与水泥净浆流动度的变化规律基本一致,对混凝土的含气量、抗压强度、渗透性能和外观质量有了明显改善,而且降低了成本；同时,从分子链结构搭配的角度分析了扩链剂的改性机理。
對四種聚羧痠繫高性能減水劑進行瞭擴鏈劑改性研究,併優化齣最佳改性工藝。結果錶明,改性後的聚羧痠繫高性能減水劑A對水泥的分散性能僅起到牴消緩釋作用,B、C、D對水泥的分散性能有很大的提高,尤其是對保坍性能較差的減水劑；改性後的減水劑對混凝土的流變性能與水泥淨漿流動度的變化規律基本一緻,對混凝土的含氣量、抗壓彊度、滲透性能和外觀質量有瞭明顯改善,而且降低瞭成本；同時,從分子鏈結構搭配的角度分析瞭擴鏈劑的改性機理。
대사충취최산계고성능감수제진행료확련제개성연구,병우화출최가개성공예。결과표명,개성후적취최산계고성능감수제A대수니적분산성능부기도저소완석작용,B、C、D대수니적분산성능유흔대적제고,우기시대보담성능교차적감수제；개성후적감수제대혼응토적류변성능여수니정장류동도적변화규률기본일치,대혼응토적함기량、항압강도、삼투성능화외관질량유료명현개선,이차강저료성본；동시,종분자련결구탑배적각도분석료확련제적개성궤리。
Four kinds of polycarboxylic high performance water reducer were modified by chain extender, and the best modification technology was optimized. The results show that the modified polycarboxylic high performance water re-ducer A only plays release effect on the dispersiveness of cement, while the modified polycarboxylic high performance wa-ter reducer B, C and D can greatly improve the dispersiveness of the cement, especially to the water reducer with poor slump performance. Furthermore, the influence of the modified water reducer on rheological properties of concrete has the same rule as that of the modified water reducer on the fluidity of cement paste. In addition, gas content, compressive strength, permeability and appearance quality of the concrete are obviously improved and the cost is also reduced. Finally, the modification mechanism of chain extender is analyzed from the point of the molecular chain structure.
