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魏子程¹ , 王    林 ¹ , 賀鑫鑫¹ , 王宏波²

( 1. 北京建筑大學(xué)土木與交通工程學(xué)院 ，北京 100044 ;

2. 陜西德和建材有限公司 ，陜西 西安 710000)

摘   要： 普通噴射混凝土在噴射過程中回彈率高，粉塵量大，強度不容易達標，特別是在富水區(qū)，這些情況更為嚴重，在噴射混凝土中摻入一種高強超微外加劑，用來改善噴射混凝土的力學(xué)性能，降低噴射混凝土的回彈率及粉塵量。本文將高強超微外加劑應(yīng)用于噴射混凝土中，研究了其對噴射混凝土力學(xué)性能及回彈率和粘結(jié)強度的影響 。試驗結(jié)果表明： 高強超微外加劑能夠顯著提高噴射混凝土的抗壓強度和抗折強度，在 C25 噴射混凝土中，高強超微外加劑摻量為 6%時，噴射混凝土 28 d 抗壓強度與抗折強度與不摻高強超微外加劑組分別提高 6. 4%與 32% ; 添加高強超微外加劑的噴射混凝土在工程應(yīng)用中回彈量平均只有 7. 3% , 比普通噴射混凝土 降低 28% , 粘結(jié)強度最高為 2. 29 MPa, 是普通噴射混凝土的 3 ~4 倍。

關(guān)鍵詞： 高強超微外加劑； 噴射混凝土； 力學(xué)性能； 回彈量； 粘結(jié)強度

中圖分類號： TU528. 042      

文獻標志碼： A      

文章編號： 1005-8249 (2023) 05-0082-06

DOI : 10. 19860/j.cnki.issn1005-8249.2023.05.014

WEI Zicheng¹ , WANG Lin¹ , HE Xinxin¹ , WANG Hongbo²

( 1. School of Civil and Transportation Engineering , Beijing University of Civil Engineering and Architecture ,

Beijing 100044 , China; 2. Shaanxi Dehe Building Materials Co. ，Ltd. ,  Xi ′an 710000 , China)

Abstract: Ordinary shotcrete in the process of spraying rebound rate is high, large amount of dust, strength is not easy to reach the standard, especially in the water-rich area, these conditions are more serious, in shotcrete mixed with a high strength ultramicro admixture, used to improve the mechanical properties of shotcrete, reduce the rebound rate of shotcrete and dust. In this paper, high strength ultramicro admixture is applied to shotcrete and its effect on mechanical properties and rebound rate of shotcrete is studied. The experimental results showed that the high-strength ultramicro admixture could significantly improve the compressive strength and flexural strength of shotcrete. In C25 shotcrete, when the dosage of high-strength ultramicro admixture was 6%, the 28d compressive strength and flexural strength of shotcrete increased by 6.4% and 32%, respectively, compared with the group without high-strength ultramicro admixture. The average rebound of shotcrete with high strength and ultra-fine admixture in engineering application is only 7.3%, 28% lower than that of ordinary shotcrete, and the highest bond strength is 2.29mpa, which is 3 ~ 4 times of that of ordinary shotcrete.

Keywords: high strength ultramicro admixture; shotcrete; mechanical properties; The springback amount; bond strength

     ?基金項目： 市屬高校基本科研業(yè)務(wù)費項目“ 輕燒氧化鎂膨脹 劑在低熟料膠凝體系中的膨脹機理及穩(wěn)定性研究 X18265”資助。

作者簡介： 魏子程  ( 1997—) , 男 ，碩士研究生 ，主要從事 建筑材料研究。

收稿日期： 2022-08-10