水利水电科技进展
水利水電科技進展
수이수전과기진전
Advances in Science and Technology of Water Resources
2015年
6期
37-40
,共4页
水工混凝土%气候变化%冻融中心温度%抗冻耐久性%试验研究
水工混凝土%氣候變化%凍融中心溫度%抗凍耐久性%試驗研究
수공혼응토%기후변화%동융중심온도%항동내구성%시험연구
hydraulic concrete%climate change%central temperature of freeze-thaw%durability of frost resistance%test research
为了提高气候变化条件下水工混凝土的抗冻耐久性,采用自制的气候模拟系统,设定了-5℃、-10℃、-17℃、-30℃、-40℃等5个冻融过程降温终了混凝土试件中心温度,研究冻融温度对F50、F100、F300等3种抗冻设计等级水工混凝土的质量损失、动弹性模量的影响。试验结果表明：随着冻融过程中降温终了试件中心温度的降低,F50、F100、F300等3种抗冻设计等级的水工混凝土的质量损失、动弹性模量损失逐渐增大,水工混凝土能经受的最大冻融循环次数也逐渐减少。降低冻融过程中混凝土试件的中心温度可引起水工混凝土抗冻耐久性的降低。
為瞭提高氣候變化條件下水工混凝土的抗凍耐久性,採用自製的氣候模擬繫統,設定瞭-5℃、-10℃、-17℃、-30℃、-40℃等5箇凍融過程降溫終瞭混凝土試件中心溫度,研究凍融溫度對F50、F100、F300等3種抗凍設計等級水工混凝土的質量損失、動彈性模量的影響。試驗結果錶明：隨著凍融過程中降溫終瞭試件中心溫度的降低,F50、F100、F300等3種抗凍設計等級的水工混凝土的質量損失、動彈性模量損失逐漸增大,水工混凝土能經受的最大凍融循環次數也逐漸減少。降低凍融過程中混凝土試件的中心溫度可引起水工混凝土抗凍耐久性的降低。
위료제고기후변화조건하수공혼응토적항동내구성,채용자제적기후모의계통,설정료-5℃、-10℃、-17℃、-30℃、-40℃등5개동융과정강온종료혼응토시건중심온도,연구동융온도대F50、F100、F300등3충항동설계등급수공혼응토적질량손실、동탄성모량적영향。시험결과표명：수착동융과정중강온종료시건중심온도적강저,F50、F100、F300등3충항동설계등급적수공혼응토적질량손실、동탄성모량손실축점증대,수공혼응토능경수적최대동융순배차수야축점감소。강저동융과정중혼응토시건적중심온도가인기수공혼응토항동내구성적강저。
In order to improve the durability of frost resistance of hydraulic concrete under climate change conditions, a climate simulation system made by the authors was employed to study the effects of freeze-thaw temperatures on the weight loss and dynamic elastic modulus of hydraulic concrete with the three designed antifreeze levels F50, F100, and F300. During the test, the freeze-thaw processes were observed with set five center temperatures of concrete samples:-5℃,-10℃,-17℃,-30℃, and -40℃. The results show that, with decreasing center temperatures of samples in the freeze-thaw processes, the weight loss and dynamic elastic modulus loss of the three designed antifreeze levels gradually increase, while the maximum withstanding numbers of freeze-thaw cycles gradually decrease. That is to say that lowering the center temperatures of concrete samples in freeze-thaw processes will decrease the durability of frost resistance of hydraulic concrete.
