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顧炳偉^{1 , 3}  ,  王景正¹  ,  龔致遠¹  ,  韓沛沛²  ,  鄒金麗¹

 

( 1 .  江蘇海洋大學 土木與港海工程學院 ，連云港 222005 ;  2.  江蘇瀚能電氣有限公司 ，連云港 222300 ;

3 .  江蘇省海洋工程基礎設施智能建造工程研究中心 ，連云港 222005)

摘   要 ：為解決超高性能混凝土 (UHPC) 早期開裂的問題，研究了不同組成、不同養護方式下 UHPC 的早期收縮情況。結果表明：UHPC 早期收縮存在一個臨界水膠比，水膠比小于臨界水膠比時 ，UHPC 早期收縮隨水 膠比增大而增大，水膠比大于臨界水膠比時 ，其收縮隨水膠比的增大而減?。环勖夯遗c礦渣粉對 UHPC 早期收縮影響表現相似，隨摻量的增加收縮減小，且粉煤灰抑制收縮的效果優于礦渣粉；硅灰摻量增加，UHPC 早期收縮增大；鋼纖維對抑制 UHPC 早期收縮有明顯效果；不同養護方式下 UHPC 的 7 d 總收縮，以熱水養護最大，標 準養護次之， 自然養護最??；4 種養護制度在前 3 d 產生的收縮均十分明顯，在 3 ~ 7 d 期間，熱水養護產生的收縮較小， 因此，實際工程中前期適當進行熱水養護，對后期抑制收縮發展有利。

關鍵詞：超高性能混凝土 ；組成 ；養護方式 ；早期收縮

中圖分類號：TU528 . 31            

文獻標志碼：A            

文章編號： 1005- 8249  (2025)  02- 0011- 07

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .02.003

 

GU Bingwei ^{1 , 3}  ,  WANG Jingzheng¹  ,  GONG Zhiyuan¹  ,  HAN Peipei2 ,  ZOU Jinli ¹

(1 . College of Civil and Harbor Engineering ,  Jiangsu Ocean University ,  Lianyungang 222005 ,  China;

2. Jiangsu Hanneng Electric Corporation Limited ,  Lianyungang 222300 ,  China;  3 . Jiangsu  Ocean

Engineering Research Center for Intelligent Infrastructure Construction ,  Lianyungang 222005 ,  China)

Abstract:The shrinkages of UHPC specimens with different constituent in different curing methods were measured by contact method in order to solve the crack problem of UHPC at early stage. The results show that there is a critical water-binder ratio for the early shrinkage of UHPC, when the water-binder ratio is less than the critical water-binder ratio, the shrinkage of UHPC increases with the increase of water-binder ratio, and decreases with the increase of water-binder ratio when the water-binder ratio is larger than the critical water-binder ratio. The effect of fly ash and slag powder on early shrinkage of UHPC is similar. The shrinkage decreases with the increase of the dosage of fly ash and slag powder, the effect of fly ash on early shrinkage control is better than that of slag powder. The early shrinkage of UHPC increases with the addition of silica fume. There is the obvious effect of steel fiber on early shrinkage control of UHPC. The total shrinkage of UHPC in 7d is the highest in hot water curing, the second in standard curing, and the lowest in natural curing. The shrinkage of the four curing methods is very obvious in the first 3d, and the shrinkage from 3d to 7d in hot water curing is the smallest in four curing methods. Therefore, the proper hot water maintenance in the early stage of the actual project is beneficial to the late development of  shrinkage inhibition.

Key words:ultra-high performance concrete; constituent; curing method; early shrinkage

作者簡介：顧炳偉  (1966—) , 男，博士，教授，研究方向： 土木工程材料的教學與研究、固體廢棄物的建材資源化利用。

收稿日期：2024 - 10 - 31