CAJ | 학술논문

为了研究水泥基材料塑性抗拉强度的增长规律，选取水泥浆体和粉煤灰浆体，对塑性阶段的毛细管负压、塑性收缩、饱和度及抗拉强度进行了试验研究，并基于固液气三相有效作用力对塑性抗拉强度和毛细管负压间关系进行了分析。结果表明：当毛细管负压小于70 kPa时，水泥基材料体系处于近似饱和的毛细管状；试验所选的2种浆体塑性抗拉强度增长规律基本一致，即在毛细管负压达到20 kPa左右前，塑性抗拉强度随毛细管负压的增加而显著增加，其后则趋于稳定；基于理想堆积体系中液相有效作用力计算出的抗拉强度明显大于试验测试结果。在考虑体系存在缺陷的基础上，推荐了塑性抗拉强度的增长规律方程。
위료연구수니기재료소성항랍강도적증장규률，선취수니장체화분매회장체，대소성계단적모세관부압、소성수축、포화도급항랍강도진행료시험연구，병기우고액기삼상유효작용력대소성항랍강도화모세관부압간관계진행료분석。결과표명：당모세관부압소우70 kPa시，수니기재료체계처우근사포화적모세관상；시험소선적2충장체소성항랍강도증장규률기본일치，즉재모세관부압체도20 kPa좌우전，소성항랍강도수모세관부압적증가이현저증가，기후칙추우은정；기우이상퇴적체계중액상유효작용력계산출적항랍강도명현대우시험측시결과。재고필체계존재결함적기출상，추천료소성항랍강도적증장규률방정。
Cement paste and fly ash paste were used to determine the growth law of the tensile strength of cement base materials at the plastic stage.The capillary pressure,plastic shrinkage,satu-ration and tensile strength of the paste were studied.Furthermore,the relationship between the ten-sile strength at the plastic stage and the capillary pressure of the paste was analyzed based on the in-vestigation of the effective force among the phases of solid,liquid and gas.The results show that the liquid-phase is continuous and at approximate saturation when the capillary pressure is less than 70 kPa.The growth law of the two pastes used in this study are similar;that is,when the capillary pres-sure is less than the critical value of about 20 kPa,the tensile strength increases dramatically with the increase in the capillary pressure,and,thereafter,it tends to be stable.The calculation results of the tensile strength based on the effective stress of the liquid phase in the unflawed granular system are higher than the experimental results of the real system.Furthermore,based on the consideration of the flaw of the real system,an exponential law is proposed to analyze the evolution of the tensile strength.