终凝

膨胀水泥浆主要在终凝后发生体积膨胀，对早期气窜影响很小。

The volume expansion of expanding cement happens after final set , which has little relation with early gas migration .

从讨论小体积砼水化热及外加剂的特性入手，提出适时利用砼水化热，保证砼终凝后利用微量热能来提高商板的早强和防止断裂。

The hydration heat and characteristics of admixtures for small volume concrete are discussed in the paper . The concrete hydration heat and the microscopic heat energy after final set can be used to improve the early strength of the concrete slab and prevent from concrete break .

NaF的速凝效果十分显著，当掺量只有02%时就可以使水泥的初凝时间控制在5分钟，终凝控制在10分钟。

0.2 % NaF can control the prehardening time in 5 minutes and final setting time in 1 minute .

随着波纹管内试件的刚度不断增加，其影响程度也随之减小，到终凝10h后这种影响可以忽略不计。

However , the influence decreases with the hardening process and becomes negligible in10 h after the final set .

它制浆后，初凝时间为60min，终凝时间210min。

In slurring , its initial setting time is 60 min and the final , 210 min.

结果表明：2种骨水泥的凝结时间基本相同，初凝时间为5min左右，终凝时间为19.5min；

The solidifying time of these bone cements is similar , 5 min initially and 19.5 min finally .

试验结果表明：（1）当SRA掺量为0.045%时可将终凝时间延长到10h；

The test proved that : ( 1 ) final setting time delay may be increased to 10h when mixing ratio of SRA at 0.045 % ;

为满足现场要求，必须加入相配伍的缓凝剂，并控制初、终凝时间在4～10h之内；

By the request of the field application the compatible retarder should be added and control the initial setting time in the scope of 4-10 h ;

锚孔钻进时机为旋喷桩固结体终凝初期12～14h；

The beginning time of anchor hole drilling operation is at best controlled in 12 ~ 14h in initial stage of the end solidification .

研制一种超效缓凝剂SRA，当掺量为0.045%时可将终凝时间延长到10h；

A new type of super retarder named SRA is introduced in this paper . When the dosage of it is 0.045 % , the final setting time can be retarded for 10 h.

采用0.25MNaH2PO4/Na2HPO4调和液调和，其初凝时间为4min，终凝时间为15min，满足临床手术要求。

The powder were mixed with 0.25M NaH2PO4 / Na2HPO4 solution . Its initial setting time was about 4 min , the final setting time was about 15 min.

研究结果表明：抛光砖粉作水泥混合材时，水泥的标准稠度用水量增加，初凝时间缩短、终凝时间略有延长；水泥28d胶砂强度活性指数可达82%；

The results showed that the water requirement for normal consistency of cement increased and the early setting time shortened as well as the final setting time prolonged , the 28d activity index of cement mortar reached 82 % .

浆体凝结时间较长，水灰质量比（0.7～1.0）∶1.0，粉煤灰掺量质量分数为60%～90%时，初凝一般大于12h，终凝一般大于20h。

The setting time is quite long , when the water cement ratio is ( 0.7-1.0 )∶ 1 and the proportion of fly ash is 60 % - 90 % , the early setting time is longer than 12 hours and the last setting time is longer than 20 hours .

水泥的初、终凝时间均有所缩短；

The initial setting and final setting time are shortened slightly ;

矿渣微粉对商品混凝土初终凝时间的影响

Initial Setting Time of Ready-Mixed Concrete Impacted by Slag Micropowder

初凝时间延缓，终凝时间基本提前；

The initial setting time is delayed , and the final setting time is ahead of time basically ;

结果发现：由于加入纤维蛋白胶，复合支架材料在一定程度上延长了磷酸钙骨水泥的初凝时间，但并不影响磷酸钙骨水泥的终凝时间；

The results show that the FG prolongs initial setting time , but does not influence final setting time .

两种减水剂对该水泥初凝时间影响不大，而终凝时间明显缩短；

The influence of the two water reducer on the initial setting time were little but shortened the final setting time remarkably .

其中丁苯胶乳杂化水泥混凝土对耐久性的提高方面更加显著。偏高岭土杂化水泥混凝土对强度的提高较大，对韧性等也有一定提高，但对混凝土的工作性有所降低，初终凝时间缩短。

While compressive strength is reduced in styrene-butadiene latex hybrid cement concrete , but the durability , toughness and workability are greatly improved then .

性能易调节，初终凝时间可根据设计和施工要求任意调整；

Properties of the slag can be adjusted and initial setting time can be adjusted discretionarily according to the requirements of design and engineering ;

结果表明：羧基丁苯乳液具有良好的减水作用，使建筑石膏初凝和终凝时间有所提前，并在一定程度上增加了建筑石膏的体积密度；

Results show that styrene-butadiene emulsion can reduce required content of mixing water , accelerate initial and final setting and increase bulk density of gypsum .

通过比较凝结期起止时间和实测的凝结时间，发现凝结期开始时间与初凝时间非常吻合，而凝结期终止时间则明显滞后于终凝时间。

The starting time of setting stage is identical with initial setting time . However , the ending time of setting stage lags behind the final setting time .

试验结果表明，水泥初，终凝时间有较强的相关性，预示着水化早期水泥凝结结构的发展有着连续性。

Results of this investigation reveal that pertinence between initial and final setting time is more stronger , indicating the continuity of setting structure development during early hydration period .

指出了商品砼的优点，详细分析了砼终凝前和砼终凝后出现裂缝的原因，并提出相应的控制措施。

The article points out the advantage of commercial concrete , expounds the cause of the crack before and after concrete coagulation , and presents the corresponding control measures .

随着水灰比增大，塑性阶段时间延长，初终凝时间延迟，初凝时体积收缩率增加。

With the increase of water to cement ratio , the plastic stage time extends , the initial set and final set prolongs , the volume shrinkage before initial set increase .

在施工中采取了混凝土出模后覆盖塑料布，初凝后用草袋覆盖，终凝后流水或洒水养护等有效的防裂措施，取得良好效果。

Some anti cracking measures are introduced during construction : first covering plastic film and covering straw bag after initial set of concrete , final sprinkling water after final set of concrete .

对小颗粒水泥在不同温度、不同密度下的抗压强度、初终凝时间、稠化时间、流变性和稳定性进行了试验研究。

Study of compressing strength , initial and final solidification time , thickening time , rheology and stability of small particle cement with different density and at different temperature were conducted in lab.

结果表明：（1）高钙灰的掺入改善了胶砂的工作性，降低了标准稠度用水量，延缓了胶材的初终凝时间；

The results show : ( 1 ) with high calcium mixing , concrete workability was modified , the water quantity needed for standard consistence decreased , initial and final setting time increased ;

当粉液比为7.5∶1、粉料占耐火材料的35%时，浆料有较好的流动性和适宜的初终凝时间。

When water / powder ratio was 7.5 ∶ 1 and the content of fine powder was 35 % , slurry fluidity was better and initial setting time and setting time were appropriate .

另外，与常规水泥相比，微细水泥的初、终凝时间也有缩短，这对提高低密度水泥体系的防窜能力也是有利的。

Comparing with conventional cement , the primary and final setting times of the fine cement are shorter , which is favorable to improve the anti-channeling ability of the cement slurry system with low density .