shrinkage cracks 中文意思是什麼
shrinkage cracks
解釋
干縮裂縫-
At the primeval moulded time, cracks are mainly caused by temperature shrinkage and autogenous shrinkage, after that, it is mostly caused by dry shrinkage
混凝土澆築初期開裂主要是溫度變形和自收縮引起，後期開裂則主要是因干縮所致。 -
When the confined shrinkage value which resulted from the confined action of all above shrinkage exceed the ultimate tensile strain, cracks occur
各種收縮變形疊加后，混凝土的限制收縮值超過極限拉伸率導致裂縫的產生。 -
Through flat experiment and circle experiment, we research the causes of cracks before hardening of concrete and after. through ingredient experiment, we research the influence of shrinkage from some ingredient ( coal ash, crushed stones and fiber ). in addition, we test some methods of construction to strengthen the anti - crack capacity of r. c. slab in building sites
通過平板試驗和圓環試驗，研究了混凝土在終凝前和終凝后裂縫的各種影響因素；通過摻合料試驗，研究混凝土的一些摻合料（粉煤灰、碎石和纖維）對其收縮變形的影響；另外，還在施工工地進行一些增強樓板抗裂能力的構造措施試驗。 -
Abstract : during construction of the capital international airport ' s garage building project, the c50 and over c60 high performance concrete has been adopted for its construction. for the aim of 1, to get a maximum reduction of cement comsumption 2, to lower the concrete ' s hydration heat 3, to reduce concrete ' s shrinkage and cracks, and 4, to promote concrete ' s performance, a high quality chilled blast furnace superfine slag has been adopted as an admixture. furthermore, the adoption of some other minerals as the admixtures to get a high performance concrete has been carried out. as a result, these procedures and operations would have developed considerably the potential activity of concrete, and eventually the multiple performance and multiple function of concrete would have been improved and promoted. in conclusion a good result has been achieved in practice
文摘:首都國際機場停車樓工程中，採用c50及c60以上高性能混凝土，為最大限度減少水泥用量，降低水化熱，減少收縮與裂縫，提高混凝土的性能，優選了有效成分含量高、質量好的水淬高爐礦渣磨細后單獨摻用，或再與其他礦物組分復合作為高性能混凝土的摻合料，以充分發揮礦渣的潛在活性，從而使混凝土的多項性能得到極大的改善和提高，並在實際應用中取得了良好的效果。 -
During construction of the capital international airport ' s garage building project, the c50 and over c60 high performance concrete has been adopted for its construction. for the aim of 1, to get a maximum reduction of cement comsumption 2, to lower the concrete ' s hydration heat 3, to reduce concrete ' s shrinkage and cracks, and 4, to promote concrete ' s performance, a high quality chilled blast furnace superfine slag has been adopted as an admixture. furthermore, the adoption of some other minerals as the admixtures to get a high performance concrete has been carried out. as a result, these procedures and operations would have developed considerably the potential activity of concrete, and eventually the multiple performance and multiple function of concrete would have been improved and promoted. in conclusion a good result has been achieved in practice
首都國際機場停車樓工程中，採用c50及c60以上高性能混凝土，為最大限度減少水泥用量，降低水化熱，減少收縮與裂縫，提高混凝土的性能，優選了有效成分含量高、質量好的水淬高爐礦渣磨細后單獨摻用，或再與其他礦物組分復合作為高性能混凝土的摻合料，以充分發揮礦渣的潛在活性，從而使混凝土的多項性能得到極大的改善和提高，並在實際應用中取得了良好的效果。 -
It has been found out that using a prestressed concrete flat slab floor can decrease the thickness of the floor slab, improve forced property and service functions of the structure, and so as to save materials, reduce cost and prevent the cracks of shrinkage and temperature
採用預應力混凝土無梁樓蓋可以降低樓板厚度，改善結構的受力性能和使用功能，而且能節約材料，降低造價，防止收縮和溫度裂縫的產生。 -
This paper expounds the shrinkage effect and temperature effect of the concrete, and advances some measures for controlling the cracks of the concrete in the construction practice
闡述了混凝土的收縮作用和溫度作用，並提出了在工程實踐中進行裂縫控制的措施。 -
It is very important for reducing and compensating concrete shrinkage and preventing cracks forming to construction and curing
施工和養護對混凝土抗裂防滲性能有重要影響；對于復合抗裂防水高性能混凝土，濕養護時間不宜低於14天。 -
Since pump high - flowability concrete commenced in late 70 ' s, it has been put to extensive application due to its advantages of fast, high - efficiency and stable quality. but its high flowing property and pumpability also cause some negative effects, such as serious shrinkage cracks at early age, which arouses wide social concern
泵送高流態混凝土自從70年代末期產生以來，以其快速高效、質量穩定等特點得到了廣泛的應用，但它的高流動性和可泵性也產生了一些負面作用，如早期收縮開裂現象比較嚴重，引起了社會的普遍關注。 -
The results shows that the combined use of fibers and expansions was superior to the use of fibers or expansion agents alone in reducing the amounts of plastic shrinkage cracks and diminishing the size of cracks, and it improved the resistance to plastic shrinkage crack extremely
文章研究了聚丙烯纖維和膨脹劑復合對砂漿塑性收縮裂縫的影響，結果顯示，纖維與膨脹劑復合，在減少塑性收縮裂縫數量和細化裂縫兩個方面均優于纖維或膨脹劑的單獨作用，砂漿抵抗塑性收縮開裂能力顯著提高。 -
Then according to temperature gradient and humidity gradient, which are the essential factors inducing concrete cracks, distribution of thermal and moisture within young concrete and numerical methods to calculate temperature stress and shrinkage stress are systematically analyzed
然後針對引起混凝土開裂的本質因素即混凝土內部的溫濕度梯度，系統地分析了混凝土溫濕度場的變化規律及溫度應力和干縮應力的數值計算方法。 -
The mechanism of physical damage of carbon fibers was clarified firstly. the precursor which attached on carbon fibers changes to inorganic ceramic under high temperature with large volume shrinkage which appearing at cracks with fiber traction and the cracks are mainly vertical to fiber axis. because of mismatched coefficients of thermal expansion, carbon fibers suffer multiple thermal stresses and are damaged
首次探明了碳纖維熱應力物理損傷機制，即碳纖維表面附著的先驅體在高溫下無機化形成陶瓷體，同時伴隨著大的體積收縮，在碳纖維的牽引下，基體的體積收縮以開裂形式出現，裂紋的取向以垂直於纖維軸向為主，由於碳纖維與基體熱膨脹系數失配，致使碳纖維在降溫過程中受到復雜熱應力，引起碳纖維損傷。 -
( 6 ) the validity of control methods of crack has been verified by using engineering instances. on the basis of the researches mentioned above, some crucial conclusions are acquired as follows : ( 1 ) during construction, the cracks in beams and girders were caused by the drop of temperature and by the difference in the inside and outside temperature. the crack in slab was caused by shrinkage due to the loss of water
通過上述研究工作得出了一些重要的成果： （ 1 ）在施工階段，大面積現澆樓蓋結構主次梁的裂縫由溫度降幅和內外溫差引起，板的裂縫主要由失水收縮引起； （ 2 ）在施工期，由水化熱引起的應力主要分佈在主次梁中，板中應力較小。
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