蒸養(yǎng)條件下超摻粉煤灰混凝土強(qiáng)度與機(jī)理研究

Study on Strength and Mechanism of Super blended Fly Ash Concrete under Steam curing Conditions

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（1．中國二十二冶集團(tuán)有限公司，唐山064000；2.武夷學(xué)院 )

中圖分類號：TU528.1 文獻(xiàn)標(biāo)志碼：A 文章編號：1005-8249（2025）01-0049-06

DOI：10.19860/j.cnki.issn1005-8249.2025.01.010

XU Junpeng'，ZHAO Tianqi1，ZHAO Rui1，HAN Chun'，LIANG Peng'ZHAO Huichuan'， ZHANG Weiguo2

(1. China MCC22 Group Co.，Ltd.，Tangshan O64000，China；2. School of Civil Engineering and Architecture， Wuyi University， Wuyishan 3543OO， China)

Abstract：Inorderto furtherunderstandtheperformancechangesof high contentindustrial solid wasteconcreteunderhightemperature steam curing conditions.The studyused acombinationof macroscopic experiments，X-ray difraction（XRD）， andscanning electron microscopy（SEM）to investigateandanalyzethe propertiesandreinforcementmechanismofC3Oconcrete prepared byflyashoversubstitution method.It wasfoundthat when flyash was excessivelyadded，thedemolding strength reached a maximum of 2O.8 MPa at a substitution rate of 20% and an excess coefficient of 1.6. At a substitution rate of 25% （2 andanexcesscoeficientof1.4，the maximum strengthof42.8MPa wasachievedat28days.Whenthesubstitutionrateoffly ash is 25% ，the excess coefficient is 1.6，and 5% of silica fume is added，the comprehensive performance of cost and strength of double blended silica fume and fly ash reaches the best，and the minimum amount of admixture is only 1.3% .In micro qualiativeandquantitativeanalysis，theCHcontentofdoubledopedsilicafumeandflyashisthelowest，thedifraction intensity of cementitious hydration product C-S-H is the best，and the microstructure is also denser.

Key words：civil enginering；high temperature steam curing；excess substitutionmethod；macromechanics；enhancement mechanism

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0 引言

混凝土作為建筑領(lǐng)域快速發(fā)展的必備建材，隨著“雙碳”綠色理念的提出，其高性能低碳生態(tài)化的改性研究更是成為一種常態(tài)。（剩余13244字）