混凝土
混凝土
혼응토
CONCRETE
2014年
10期
127-130
,共4页
干混砂浆%胶凝材料%抗压强度%扫描电子显微镜%压汞测孔法
榦混砂漿%膠凝材料%抗壓彊度%掃描電子顯微鏡%壓汞測孔法
간혼사장%효응재료%항압강도%소묘전자현미경%압홍측공법
dry-mixed mortar%cementing material%unconfined compressive strength(UCS)%scanning electron microscope(SEM)%mercury intrusion porosimeter(MIP)
为了研究胶凝材料性质对干混砂浆抗压强度的影响规律，共制备了24组样品，其中3组样品的微观形貌和孔结构采用扫描电子显微镜和压汞测孔仪（Autopore IV 9500）等测试手段进行了分析。试验结果表明：无论胶凝材料是100%水泥、50%水泥+50%矿渣粉和50%水泥+50%粉煤灰，7 d和28 d砂浆抗压强度均随胶凝材料总量增加而明显提高，增加水泥掺量对砂浆早期强度有利；与以100%水泥为胶凝材料制备的砂浆相比，当每吨干混砂浆中胶凝材料总量分别为100、150、200、250 kg时，以50%水泥+50%矿渣粉为胶凝材料制备的砂浆的抗压强度分别提高47%、55%、10%和0，而以50%水泥+50%粉煤灰为胶凝材料制备的砂浆的抗压强度分别降低77%、66%、56%和44%。与15%水泥制备的砂浆28 d硬化体相比，7.5%水泥+7.5%矿渣制备的砂浆28 d硬化体中水化产物更多或更分散、基体与骨料结合更密实、总孔隙更低及孔径更细；7.5%水泥+7.5%粉煤灰制备的砂浆28 d硬化体中水化产物更少、基体更松散、总孔隙更高及孔径更大。
為瞭研究膠凝材料性質對榦混砂漿抗壓彊度的影響規律，共製備瞭24組樣品，其中3組樣品的微觀形貌和孔結構採用掃描電子顯微鏡和壓汞測孔儀（Autopore IV 9500）等測試手段進行瞭分析。試驗結果錶明：無論膠凝材料是100%水泥、50%水泥+50%礦渣粉和50%水泥+50%粉煤灰，7 d和28 d砂漿抗壓彊度均隨膠凝材料總量增加而明顯提高，增加水泥摻量對砂漿早期彊度有利；與以100%水泥為膠凝材料製備的砂漿相比，噹每噸榦混砂漿中膠凝材料總量分彆為100、150、200、250 kg時，以50%水泥+50%礦渣粉為膠凝材料製備的砂漿的抗壓彊度分彆提高47%、55%、10%和0，而以50%水泥+50%粉煤灰為膠凝材料製備的砂漿的抗壓彊度分彆降低77%、66%、56%和44%。與15%水泥製備的砂漿28 d硬化體相比，7.5%水泥+7.5%礦渣製備的砂漿28 d硬化體中水化產物更多或更分散、基體與骨料結閤更密實、總孔隙更低及孔徑更細；7.5%水泥+7.5%粉煤灰製備的砂漿28 d硬化體中水化產物更少、基體更鬆散、總孔隙更高及孔徑更大。
위료연구효응재료성질대간혼사장항압강도적영향규률，공제비료24조양품，기중3조양품적미관형모화공결구채용소묘전자현미경화압홍측공의（Autopore IV 9500）등측시수단진행료분석。시험결과표명：무론효응재료시100%수니、50%수니+50%광사분화50%수니+50%분매회，7 d화28 d사장항압강도균수효응재료총량증가이명현제고，증가수니참량대사장조기강도유리；여이100%수니위효응재료제비적사장상비，당매둔간혼사장중효응재료총량분별위100、150、200、250 kg시，이50%수니+50%광사분위효응재료제비적사장적항압강도분별제고47%、55%、10%화0，이이50%수니+50%분매회위효응재료제비적사장적항압강도분별강저77%、66%、56%화44%。여15%수니제비적사장28 d경화체상비，7.5%수니+7.5%광사제비적사장28 d경화체중수화산물경다혹경분산、기체여골료결합경밀실、총공극경저급공경경세；7.5%수니+7.5%분매회제비적사장28 d경화체중수화산물경소、기체경송산、총공극경고급공경경대。
24 groups of samples were made so as to investigating the influence of the properties of cementing materials on the uncon-fined compressive strengths (UCS) of dry-mixed mortar.The morphology and pore structure of 3 groups of 24 samples were investigated by scanning electron microscope(SEM) and mercury intrusion porosimeter(Autopore IV 9500)(MIP).The results showed that the 7 d and 28 d UCS of hardened mortars increased with the increase of the total content of cementing materials no matter what cementing materials were 100%cement and 50%cement+50%slag powder and 50%cement+50%fly-ash ,and the increase of cement content was in favour of early strength of hardened mortar.Comparing with the hardened mortar of 100%cement as cementing material ,the 28 d UCS of the hard-ened mortar of 50%cement+50%slag powder as cementing material respectively increased 47%,55%,10%and 0,while the 28 d UCS of the hardened mortar of 50%cement+50%fly-ash as cementing material respectively decreased 77%,66%,56%and 44%when the total content of cementing material in per ton dry-mixed mortar respectively was 100、150、200、250 kg.Comparing with the 28 d hardened mortar with 15%cement,the hydration product was more or more dispersing,the bond between matrix and aggregate was thicker,the total porosity was lower,and pore size was finer in the 28 d hardened mortar with 7.5%cement+7.5%slag powder,while the hydration product was fewer, the matrix was looser,the total porosity was higher,and pore size was bigger in the 28 d hardened mortar with 7.5%cement+7.5%fly-ash.
