concreting temperature 中文意思是什麼
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Most of northern regions have a long winter. concreting in such regions is usually under minus - temperature, so it is essential to study the performance of concrete under minus - temperature
我國北方廣大地區冬季氣溫低、時間長，混凝土施工均處于負溫的條件下，因此研究負溫條件下的混凝土的性能極為必要。 -
If the cold plate temperature is higher than a certain critical value, for instance, - 12 c under our observed experimental conditions, the higher the air relative humidity is, the bigger the water droplets concreting on the cold plate, and the later the water droplets froze. however, if the cold plate temperature is lower than a certain critical value, the influence of air relative humidity on the frozen time of water droplets was not observed. if the cold plate temperature is higher than a certain critical value, for example, - 20 c under our observed experimental conditions, frost deposition is through condensation, or condensation frosting
結果表明，冷壁面溫度越低，水珠凍結時間越短，且凍結的冰珠越小;當冷壁面溫度高於某一臨界值，譬如，在我們給定的實驗條件下， - 12 c時，空氣相對濕度越大，冷壁面上凝結的水珠越大，水珠凍結越晚，但當冷壁面溫度較低時，幾乎觀察不到空氣相對濕度對水珠凍結時間的影響;冷壁面溫度高於某一臨界值，譬如，在我們給定的實驗條件下， - 20 c時，發生凝結成霜，冷麵溫度低於這一臨界值時，發生凝華成霜;隨著實驗工況的不同，觀察到的霜晶呈現八種不同的形態。 -
Originally from green concrete and concreting in minus - temperature, the critical strength of frozen injury of minus - temperature calcium - enriched fly ash concrete and the rule of strength development are studied in this paper. through the test of resistance of freezing - thawing cycles and chloride diffusivity, the influence of curing system and calcium - enriched fly ash on the performance of concrete are studied ; and through the modern methods ( xrd, sem, and so on ), the hydration products, pore structures and microstructure are studied
本文既著眼于綠色混凝土，又致力於混凝土的負溫施工，研究了增鈣粉煤灰混凝土的抗凍臨界強度及其負溫抗壓強度發展規律;通過快凍試驗和氯離子滲透試驗，研究養護制度和增鈣粉煤灰摻合料對混凝土耐久性能的影響;並通過光學顯微鏡法、掃描電鏡和xrd等現代分析方法，研究負溫增鈣粉煤灰混凝土的水化產物、孔結構和顯微結構。
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