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宋少民 ，盧超琦

 

（ 北京建筑大學 ，建筑結構與環境修復功能材料北京市重點試驗室 ，北京 100044)

摘   要 ：從粗骨料針片狀顆粒角度出發 ，研究其含量和粒徑對高強混凝土性能的影響。選取摻加 5% 、15%   和25% 針片狀顆粒含量的粗骨料配制混凝土 ，對混凝土的工作性能 、力學性能和耐久性能進行試驗研究 ；選取  5 ~ 10 mm 、10 ~ 16 mm 和 16 ~ 20 mm 共三種粒徑區間的針片狀顆粒 ，探究粒徑大小對混凝土性能的影響規律。結  果表明：針片狀顆粒含量增加 ，高強混凝土和易性和泵送性能變差 ，混凝土抗壓強度降低 ，混凝土收縮增大， 且對高強混凝土耐久性能不利 ；混凝土拌合物坍落度和擴展度 、硬化混凝土各齡期抗壓強度均隨著粗骨料中針  片狀顆粒粒徑增大而降低 ；綜合考慮針片狀顆粒對高強混凝土性能影響規律 ，建議控制針片狀顆粒含量不超過  5% ;  同時 ，在計算針片狀顆粒含量時 ，需在標準計算方法基礎上按不同粒徑針片狀顆粒分別乘以其對應的影響  系數進行修正 ，以實現對粗骨料粒形更好的控制。

關鍵詞：粗骨料 ；針片狀顆粒 ；高強混凝土 ；性能影響

中圖分類號：TU528 . 041            

文獻標志碼：A            

文章編號： 1005- 8249  (2024)  04- 0021- 06

DOI:10. 19860/j.cnki.issn1005 - 8249.2024.04.004

 

SONG Shaomin ,  LU Chaoqi

(Beijing Key Laboratory of Building Structure and Environmental Remediation Functional Materials ,

Beijing University of Civil Engineering and Architecture ,  Beijing 100044 ,  China)

Abstract： From the perspective of coarse aggregate elongated and flaky particles, the effect of its content and particle size on the properties of high strength concrete was investigated, The concrete was prepared with four kinds of coarse aggregates with 5%,15% and 25% of the content of elongated and flaky particles ,and the working ,mechanical and durability properties of the concrete were investigated, and three kinds of elongated and flaky particles in the size range of 5-10 mm,10-16 mm and 16-20 mm were selected to investigated the influence of the size on the performance of the concrete.The results show that the increase in the content of elongated and flaky particles,high- strength concrete ease and pumping performance deterioration,concrete compressive strength decreased,concrete shrinkage increased,and the durability of high-strength concrete is unfavourable;concrete mix slump and expansion,hardened concrete compressive strength at various ages with the increase in the size of the elongated and flaky particles in the coarse aggregate and reduce.Considering the influence of elongated and flaky particles on the performance of high-strength concrete,it is suggested to control the content of elongated and flaky particles not more than 5%;at the same time,when calculating the content of elongated and flaky particles,it is necessary to multiply the influence coefficients of elongated and flaky particles of different particle sizes on the basis of the standard method of calculation,so as to achieve a better control on the particle shape of the coarse aggregates.

Keywords： coarse aggregates；elongated and flaky particles；high strength concrete；performance influence

作者簡介：宋少民  (1965—) ,  男 ，碩士 ，教授 ，研究方向： 高性能混凝土。

通信作者：盧超琦  (1999—) ,  男 ，碩士 ，研究方向：建筑材料。

收稿日期：2023- 03- 01