1) free thermal strain
自由膨胀应变
1.
The regularities of the free thermal strain and temperature strain under stress and transient thermal strain of high strength concrete(C60,C80)at elevated temperature have been in vestigated and compared with those o f normal strength concrete(C30)in this paper with 36concrete prism s pecimens(100mm ×100mm ×300mm)tested.
本文通过对36个混凝土棱柱体试件(100mm×100mm×300mm)高温变形试验,研究了高温时高强混凝土(C60,C80)自由膨胀应变、恒定压应力下的温度应变和瞬态热应变的变化规律,并与普通强度混凝土(C30)高温变形性能进行了比较。
2.
Thermal strains,free thermal strain and short-time creep strain of self-compacting concrete(SCC) with addition of polypropylene fiber(PPF) were studied.
针对掺加聚丙烯纤维的自密实混凝土,进行了温度应变、自由膨胀应变和高温徐变的试验研究以及差热及热重分析、环境扫描电镜和汞压力测孔法试验。
2) Free expansion
自由膨胀
1.
Strain characteristics of different expansion factors(such as free expansion,confined expansion and effective expansion,etc) and the influential factors are analyzed.
通过对自由条件下的4种不同配合比自应力混凝土和11组不同配合比、不同尺寸的自应力钢管混凝土进行连续观测,讨论了不同条件下混凝土结构所产生的自应力变化规律,分析了自应力混凝土的自由膨胀、限制膨胀和有效膨胀等应变特点及其影响因素。
3) swelling strain
膨胀应变
1.
According to the tests results,it is concluded that: the vertical swelling pressure is remarkably decreased with the increase of small swelling strain;the swelling pressure and dry density,initial moisture content and swelling strain present exponential relations.
试验结果表明,膨胀应变略微增加,膨胀力大幅降低;膨胀力与干密度、初始含水量及膨胀应变成指数关系。
4) freely expanding ring
自由膨胀环
1.
Super-high strain rate impact tensile testing data of some resin matrix composite,such as Kevlar,glass and carbon fibers reinforced composites,were obtained by freely expanding ring experiment in which shaping of explosive cylinder and design of sample rings were optimized,and .
通过自由膨胀环实验,得到了一些芳纶纤维、玻璃纤维、碳纤维等增强的树脂基复合材料在超高压应变率下的冲击拉伸试验数据,在实验中应用了简便的应变片电测技术,并优化了装药和试样环的设计。
5) free-expansion rate
自由膨胀率
1.
The results showed that retarder used together with sulfoaluminate expansion agent can reduce restrained-expansion rate of expansion agent, and increase its early stage free-expansion rate and expansion index, as a result reduce its efficient expansion energy.
结果表明:缓凝剂和硫铝酸盐型膨胀剂复合使用时,会降低膨胀剂的限制膨胀率,增大其早期自由膨胀率及膨胀指数,从而降低其有效膨胀能。
2.
The results showed that the synergy effect of retarders used together with superplasticizers can reduce the restrained-expansion rate and free-expansion rate of ulfo-aluminate expansive agents mortar specimens in water or air curing condition,but the expansion indexes of mortar specimens at .
结果表明:缓凝剂与高效减水剂的协同效应会降低硫铝酸盐型膨胀剂在水中养护和空气中养护条件下的限制膨胀率、自由膨胀率,增大膨胀剂砂浆水养28 d的膨胀指数,从而降低了硫铝酸盐型膨胀剂有效膨胀能的利用。
3.
The results showed that superplasticizer used together with sulfo-aluminate expansive agents can reduce restrained-expansion rate of expansive agent,and drop free-expansion rate mixing naphthalene series and amino sulfonic,increase expansion index,so resulting in the reduction of efficient expansion energy of expansive agent.
结果表明:高效减水剂和硫铝酸盐型膨胀剂复合使用时,会降低膨胀剂的限制膨胀率,降低复掺萘系和氨基的自由膨胀率,增大膨胀指数,从而降低其有效膨胀能。
6) free swelling ratio
自由膨胀率
1.
Effect of soil sample preparation on free swelling ratio and its improved measures;
土样制备对自由膨胀率的影响及其改进方法
2.
Free swelling ratio is an important index for the identification and classification of expansive soils,and it s meaningful to research the relationship between the free swelling ratio and the architectural characteristic of expansive soils.
自由膨胀率是膨胀土判别和分类的一项重要指标,研究自由膨胀率特征与膨胀土结构特性关系有着重要意义。
3.
among selling ratio ( δ_(ep) ),swelling force ( P_e), and free swelling ratio ( δ_(er)).
具有膨胀土工程地质性质的粘性土,膨胀试验指标有时会表现为不协调性,膨胀率(δep)、膨胀力(Pe)、自由膨胀率(δef)指标显示不出膨胀性能的一致性。
补充资料：焦耳气体自由膨胀实验
研究气体内能的实验。是J.P.焦耳于1845年完成的。实验装置如下图所示。容器A内装有气体，B抽成真空，盛有水的容器D用绝热壁制成，A、B浸在温度为T的水中，达到热平衡后打开活栓C，气体膨胀而进入B，因气体膨胀时不受阻碍,所以称为自由膨胀。气体因膨胀而改变了体积,从温度计E读数的变化来测定气体内能与体积变化的关系（质量不变）。一般把在等内能过程中因气体自由膨胀时体积V 改变一个单位而引起温度T变化的这种现象称为焦耳效应,而把这个量称为焦耳系数，即
式中U为内能，CV为定容热容。在当时的测量精度下,实验发现λ＝0，即气体的内能只是温度的函数，与体积无关，称之为焦耳定律。实验证明，遵守焦耳定律的气体也遵守玻意耳定律(见理想气体状态方程)，这种气体叫做理想气体。理想气体的内能只和温度有关，是因为理想气体分子之间与距离有关的相互作用可忽略不计，而实际气体则需计及这部分相互作用。在焦耳实验中，没有观察到气体温度的变化，即内能不随体积变化，这是因为水的热容大，气体内能的变化不能使水温发生可测的变化。
式中U为内能，CV为定容热容。在当时的测量精度下,实验发现λ＝0，即气体的内能只是温度的函数，与体积无关，称之为焦耳定律。实验证明，遵守焦耳定律的气体也遵守玻意耳定律(见理想气体状态方程)，这种气体叫做理想气体。理想气体的内能只和温度有关，是因为理想气体分子之间与距离有关的相互作用可忽略不计，而实际气体则需计及这部分相互作用。在焦耳实验中，没有观察到气体温度的变化，即内能不随体积变化，这是因为水的热容大，气体内能的变化不能使水温发生可测的变化。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条