石料生產線干縮性能研究

石料生產線干縮性能研究

本文研究了混凝土石料生產線基本力學性能的，點膠石料生產線骨料混凝土在機械性能的滿足內外相關和實際工程的需要，同時，對骨料混凝土的干燥收縮率的數學模型，石料生產線，提供要的力學性能參數;其次，鑒于目前混凝土收縮預測數學模型，很少考慮石骨料生產線的加性效應的現(xian)狀(影(ying)響系數(shu)(shu))，考慮一個石(shi)(shi)材生(sheng)產線了總(zong)，工程中常用的添加劑(ji)(包括粉(fen)煤灰、減水劑(ji)、膨脹劑(ji))影(ying)響系數(shu)(shu)的大(da)小，組成(cheng)，環境濕度(du)、混(hun)(hun)(hun)凝土(tu)(tu)強度(du)等級、主(zhu)要影(ying)響因素如骨(gu)料(liao)混(hun)(hun)(hun)凝土(tu)(tu)的干燥收縮(suo)的數(shu)(shu)學模型(xing)石(shi)(shi)料(liao)生(sheng)產線混(hun)(hun)(hun)凝土(tu)(tu)強度(du)并轉換成(cheng)應變(bian)增量(liang)，用FORTRAN語言(yan)用戶子程序(xu)USDFLD和變(bian)量(liang)的熱應變(bian)作為中間變(bian)量(liang)，石(shi)(shi)料(liao)生(sheng)產線的骨(gu)料(liao)混(hun)(hun)(hun)凝土(tu)(tu)收縮(suo)的有限(xian)元(yuan)分(fen)析(xi)(xi)模型(xing)，并進行要的實(shi)驗(yan)(yan)(yan)驗(yan)(yan)(yan)證。后，通過有限(xian)元(yuan)分(fen)析(xi)(xi)、試驗(yan)(yan)(yan)驗(yan)(yan)(yan)證和理論分(fen)析(xi)(xi)，研究石(shi)(shi)料(liao)生(sheng)產線骨(gu)料(liao)混(hun)(hun)(hun)凝土(tu)(tu)干縮(suo)機理。

先對混(hun)(hun)(hun)(hun)(hun)(hun)凝(ning)(ning)土(tu)配合(he)比設(she)計C30石(shi)(shi)(shi)(shi)(shi)(shi)(shi)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)生(sheng)產線(xian)(xian)(xian)(xian)為基準(zhun)，骨(gu)(gu)(gu)(gu)(gu)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)混(hun)(hun)(hun)(hun)(hun)(hun)凝(ning)(ning)土(tu)的(de)(de)(de)(de)(de)(de)(de)(de)(de)收縮模型(xing)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)生(sheng)產線(xian)(xian)(xian)(xian)基本(ben)力學參數選擇試驗，并進行(xing)了(le)理論(lun)分析，結果表明，石(shi)(shi)(shi)(shi)(shi)(shi)(shi)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)生(sheng)產線(xian)(xian)(xian)(xian)的(de)(de)(de)(de)(de)(de)(de)(de)(de)增(zeng)(zeng)加(jia)了(le)混(hun)(hun)(hun)(hun)(hun)(hun)凝(ning)(ning)土(tu)骨(gu)(gu)(gu)(gu)(gu)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)流動性(xing)、孔隙結構和綜(zong)合(he)影響下的(de)(de)(de)(de)(de)(de)(de)(de)(de)舊水泥(ni)砂漿，當低石(shi)(shi)(shi)(shi)(shi)(shi)(shi)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)生(sheng)產線(xian)(xian)(xian)(xian)骨(gu)(gu)(gu)(gu)(gu)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)含量(liang)(liang)提(ti)高(gao)骨(gu)(gu)(gu)(gu)(gu)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)混(hun)(hun)(hun)(hun)(hun)(hun)凝(ning)(ning)土(tu)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)生(sheng)產線(xian)(xian)(xian)(xian)的(de)(de)(de)(de)(de)(de)(de)(de)(de)實力，但(dan)太多(duo)的(de)(de)(de)(de)(de)(de)(de)(de)(de)碎石(shi)(shi)(shi)(shi)(shi)(shi)(shi)骨(gu)(gu)(gu)(gu)(gu)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)的(de)(de)(de)(de)(de)(de)(de)(de)(de)含量(liang)(liang)可以導致(zhi)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)生(sheng)產線(xian)(xian)(xian)(xian)骨(gu)(gu)(gu)(gu)(gu)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)混(hun)(hun)(hun)(hun)(hun)(hun)凝(ning)(ning)土(tu)力學性(xing)能(neng)的(de)(de)(de)(de)(de)(de)(de)(de)(de)和C它(ta)與石(shi)(shi)(shi)(shi)(shi)(shi)(shi)材骨(gu)(gu)(gu)(gu)(gu)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)生(sheng)產線(xian)(xian)(xian)(xian)產品(pin)下降的(de)(de)(de)(de)(de)(de)(de)(de)(de)情況下;由于粉(fen)煤灰(hui)的(de)(de)(de)(de)(de)(de)(de)(de)(de)滾動效果，提(ti)高(gao)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)生(sheng)產線(xian)(xian)(xian)(xian)骨(gu)(gu)(gu)(gu)(gu)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)混(hun)(hun)(hun)(hun)(hun)(hun)凝(ning)(ning)土(tu)的(de)(de)(de)(de)(de)(de)(de)(de)(de)流動，因為它(ta)提(ti)高(gao)了(le)骨(gu)(gu)(gu)(gu)(gu)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)混(hun)(hun)(hun)(hun)(hun)(hun)凝(ning)(ning)土(tu)孔隙結構的(de)(de)(de)(de)(de)(de)(de)(de)(de)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)材生(sheng)產線(xian)(xian)(xian)(xian)，提(ti)高(gao)骨(gu)(gu)(gu)(gu)(gu)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)混(hun)(hun)(hun)(hun)(hun)(hun)凝(ning)(ning)土(tu)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)生(sheng)產線(xian)(xian)(xian)(xian)粉(fen)煤灰(hui)機(ji)械性(xing)能(neng)。固定在混(hun)(hun)(hun)(hun)(hun)(hun)合(he)水和水泥(ni)用量(liang)(liang)，減(jian)(jian)水劑(ji)的(de)(de)(de)(de)(de)(de)(de)(de)(de)加(jia)入(ru)相(xiang)當于相(xiang)對劑(ji)量(liang)(liang)增(zeng)(zeng)加(jia)拌和水，混(hun)(hun)(hun)(hun)(hun)(hun)凝(ning)(ning)土(tu)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)生(sheng)產線(xian)(xian)(xian)(xian)的(de)(de)(de)(de)(de)(de)(de)(de)(de)流動性(xing)，但(dan)同時(shi)導致(zhi)骨(gu)(gu)(gu)(gu)(gu)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)混(hun)(hun)(hun)(hun)(hun)(hun)凝(ning)(ning)土(tu)孔隙率增(zeng)(zeng)加(jia)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)生(sheng)產線(xian)(xian)(xian)(xian)，石(shi)(shi)(shi)(shi)(shi)(shi)(shi)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)生(sheng)產線(xian)(xian)(xian)(xian)骨(gu)(gu)(gu)(gu)(gu)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)混(hun)(hun)(hun)(hun)(hun)(hun)凝(ning)(ning)土(tu)強度(du)(du)逐(zhu)漸減(jian)(jian)小，隨著水還原劑(ji)用量(liang)(liang)的(de)(de)(de)(de)(de)(de)(de)(de)(de);膨(peng)脹(zhang)劑(ji)的(de)(de)(de)(de)(de)(de)(de)(de)(de)加(jia)入(ru)了(le)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)生(sheng)產線(xian)(xian)(xian)(xian)骨(gu)(gu)(gu)(gu)(gu)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)混(hun)(hun)(hun)(hun)(hun)(hun)凝(ning)(ning)土(tu)的(de)(de)(de)(de)(de)(de)(de)(de)(de)流動性(xing)，但(dan)同時(shi)也增(zeng)(zeng)強了(le)凝(ning)(ning)聚(ju)力和水混(hun)(hun)(hun)(hun)(hun)(hun)合(he)的(de)(de)(de)(de)(de)(de)(de)(de)(de)保留(liu)。只(zhi)是適量(liang)(liang)膨(peng)脹(zhang)劑(ji)含量(liang)(liang)有助(zhu)于提(ti)高(gao)骨(gu)(gu)(gu)(gu)(gu)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)混(hun)(hun)(hun)(hun)(hun)(hun)凝(ning)(ning)土(tu)石(shi)(shi)(shi)(shi)(shi)(shi)(shi)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)生(sheng)產線(xian)(xian)(xian)(xian)的(de)(de)(de)(de)(de)(de)(de)(de)(de)強度(du)(du)，但(dan)當膨(peng)脹(zhang)劑(ji)摻量(liang)(liang)較(jiao)(jiao)大，石(shi)(shi)(shi)(shi)(shi)(shi)(shi)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)生(sheng)產線(xian)(xian)(xian)(xian)骨(gu)(gu)(gu)(gu)(gu)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)混(hun)(hun)(hun)(hun)(hun)(hun)凝(ning)(ning)土(tu)強度(du)(du)的(de)(de)(de)(de)(de)(de)(de)(de)(de);石(shi)(shi)(shi)(shi)(shi)(shi)(shi)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)生(sheng)產線(xian)(xian)(xian)(xian)骨(gu)(gu)(gu)(gu)(gu)料(liao)(liao)(liao)(liao)(liao)(liao)(liao)混(hun)(hun)(hun)(hun)(hun)(hun)凝(ning)(ning)土(tu)的(de)(de)(de)(de)(de)(de)(de)(de)(de)彈(dan)性(xing)模量(liang)(liang)進行(xing)了(le)測(ce)試和分析，并對混(hun)(hun)(hun)(hun)(hun)(hun)凝(ning)(ning)土(tu)彈(dan)性(xing)模量(liang)(liang)預測(ce)的(de)(de)(de)(de)(de)(de)(de)(de)(de)比較(jiao)(jiao)。

其次，通過小麥(mai)Marquardt法測(ce)(ce)試的(de)(de)(de)(de)(de)(de)基礎上(Levenberg Marquardt)考慮膨脹(zhang)劑(ji)的(de)(de)(de)(de)(de)(de)骨(gu)料(liao)(liao)(liao)的(de)(de)(de)(de)(de)(de)影響系數(shu)，提(ti)出了石(shi)材(cai)生(sheng)(sheng)產線(xian)(xian)(xian)擬(ni)(ni)合(he)一般的(de)(de)(de)(de)(de)(de)局優化(hua)方法，粉煤灰(hui)和(he)減水劑(ji)和(he)石(shi)料(liao)(liao)(liao)生(sheng)(sheng)產線(xian)(xian)(xian)的(de)(de)(de)(de)(de)(de)骨(gu)料(liao)(liao)(liao)混(hun)(hun)凝(ning)(ning)土(tu)的(de)(de)(de)(de)(de)(de)干(gan)(gan)(gan)(gan)燥(zao)收(shou)(shou)(shou)縮(suo)預測(ce)(ce)的(de)(de)(de)(de)(de)(de)數(shu)學模(mo)型，并將其轉化(hua)為應(ying)變(bian)(bian)(bian)增(zeng)量(liang)(5.1)，用(yong)FORTRAN語言編(bian)制用(yong)戶子程(cheng)序(xu)USDFLD和(he)熱應(ying)變(bian)(bian)(bian)場變(bian)(bian)(bian)量(liang)可以轉換為中間(jian)(jian)變(bian)(bian)(bian)量(liang)編(bian)寫的(de)(de)(de)(de)(de)(de)，從(cong)而應(ying)用(yong)大型有限元分(fen)(fen)析軟件(jian)ABAQUS實現(xian)骨(gu)料(liao)(liao)(liao)混(hun)(hun)凝(ning)(ning)土(tu)收(shou)(shou)(shou)縮(suo)數(shu)值(zhi)(zhi)模(mo)擬(ni)(ni)石(shi)料(liao)(liao)(liao)生(sheng)(sheng)產線(xian)(xian)(xian)，和(he)進行(xing)要的(de)(de)(de)(de)(de)(de)測(ce)(ce)試。早期(qi)的(de)(de)(de)(de)(de)(de)研究結果表明(ming)，干(gan)(gan)(gan)(gan)燥(zao)，石(shi)料(liao)(liao)(liao)生(sheng)(sheng)產線(xian)(xian)(xian)骨(gu)料(liao)(liao)(liao)混(hun)(hun)凝(ning)(ning)土(tu)的(de)(de)(de)(de)(de)(de)米塞斯應(ying)力(li)值(zhi)(zhi)和(he)位移(yi)的(de)(de)(de)(de)(de)(de)(收(shou)(shou)(shou)縮(suo))增(zeng)長尤為，但隨著干(gan)(gan)(gan)(gan)燥(zao)的(de)(de)(de)(de)(de)(de)時代發展，逐漸變(bian)(bian)(bian)緩;位移(yi)的(de)(de)(de)(de)(de)(de)變(bian)(bian)(bian)化(hua)先(xian)發生(sheng)(sheng)在(zai)干(gan)(gan)(gan)(gan)燥(zao)收(shou)(shou)(shou)縮(suo)試件(jian)表面，和(he)大位移(yi)變(bian)(bian)(bian)化(hua)也(ye)在(zai)試樣的(de)(de)(de)(de)(de)(de)頂部。當(dang)干(gan)(gan)(gan)(gan)縮(suo)擴(kuo)散(san)至50mm深度，以低頻時間(jian)(jian);誤差分(fen)(fen)析表明(ming)，骨(gu)料(liao)(liao)(liao)混(hun)(hun)凝(ning)(ning)土(tu)干(gan)(gan)(gan)(gan)縮(suo)的(de)(de)(de)(de)(de)(de)石(shi)料(liao)(liao)(liao)生(sheng)(sheng)產線(xian)(xian)(xian)的(de)(de)(de)(de)(de)(de)計算(suan)值(zhi)(zhi)與試驗結果吻合(he)良好。石(shi)料(liao)(liao)(liao)生(sheng)(sheng)產線(xian)(xian)(xian)上骨(gu)料(liao)(liao)(liao)混(hun)(hun)凝(ning)(ning)土(tu)的(de)(de)(de)(de)(de)(de)應(ying)力(li)值(zhi)(zhi)與骨(gu)料(liao)(liao)(liao)混(hun)(hun)凝(ning)(ning)土(tu)的(de)(de)(de)(de)(de)(de)應(ying)力(li)值(zhi)(zhi)之間(jian)(jian)存在(zai)良好的(de)(de)(de)(de)(de)(de)線(xian)(xian)(xian)性相關關系。石(shi)料(liao)(liao)(liao)生(sheng)(sheng)產線(xian)(xian)(xian)骨(gu)料(liao)(liao)(liao)混(hun)(hun)凝(ning)(ning)土(tu)干(gan)(gan)(gan)(gan)縮(suo)率略高于石(shi)料(liao)(liao)(liao)生(sheng)(sheng)產線(xian)(xian)(xian)在(zai)相同條件(jian)下(xia)的(de)(de)(de)(de)(de)(de)干(gan)(gan)(gan)(gan)縮(suo)。

第三、通過對骨料混凝土的收縮理論石料生產線的孔隙結構模型，并通過實驗研究和理論分析，數值模擬方法探討骨料石料生產線、減水劑、膨脹劑、粉煤灰添加，如石料生產線骨料混凝土的孔結構和潤濕性材料的混凝土不同因素，水分遷移狀態的變化，石料生產線的是對混凝土收縮變形的機理分析，骨料混凝土的石料生產線與骨料混凝土的收縮機理相似的石料生產線石料生產線骨料混凝土收縮變形是孔隙結構、材料、水潤濕性和水濃度場分布綜合作用的結果。通過提高集料混凝土的孔結構，石料生產線骨料混凝土材料與水的潤濕性的(增大接觸角)，以及減少水分的擴散速率，有利于抑制骨料混凝土石料生產線干燥收縮。利用上述理論可以很好的解釋了水灰比，為骨料石料生產線、減水劑、粉煤灰、碎石生產線，骨料混凝(ning)土(tu)的收(shou)縮、膨(peng)脹混凝(ning)土(tu)收(shou)縮的作用(yong)機制可以利用(yong)“相對變(bian)形(xing)(xing)”和“反(fan)變(bian)形(xing)(xing)”理論的解釋。

第四,采(cai)用(yong)大型有限元分(fen)析(xi)軟件ABAQUS中質(zhi)量(liang)(liang)擴散模塊對石料(liao)生產(chan)線(xian)(xian)骨料(liao)混凝(ning)(ning)土(tu)材料(liao)水(shui)(shui)(shui)分(fen)擴散行(xing)為進(jin)行(xing)模擬計算,并(bing)(bing)進(jin)行(xing)了(le)實驗驗證,同(tong)時(shi),通過(guo)(guo)實驗研究分(fen)析(xi)了(le)石料(liao)生產(chan)線(xian)(xian)骨料(liao)混凝(ning)(ning)土(tu)干縮值(zhi)與失水(shui)(shui)(shui)量(liang)(liang)之間(jian)的(de)關系(xi)。結果(guo)表(biao)明：通過(guo)(guo)誤差分(fen)析(xi)表(biao)明,石料(liao)生產(chan)線(xian)(xian)骨料(liao)混凝(ning)(ning)土(tu)水(shui)(shui)(shui)分(fen)遷移模型失水(shui)(shui)(shui)量(liang)(liang)計算值(zhi)與室內實驗測(ce)試(shi)值(zhi)吻合較好;水(shui)(shui)(shui)分(fen)的(de)蒸發先(xian)從石料(liao)生產(chan)線(xian)(xian)骨料(liao)混凝(ning)(ning)土(tu)表(biao)面開始,并(bing)(bing)迅速(su)達到平(ping)衡(heng)值(zhi),然后逐漸擴展到石料(liao)生產(chan)線(xian)(xian)骨料(liao)混凝(ning)(ning)土(tu)的(de)內部(bu),擴展的(de)速(su)率其緩慢,終達到與環境濕度平(ping)衡(heng),在擴散過(guo)(guo)程中,水(shui)(shui)(shui)分(fen)濃(nong)度呈(cheng)梯度分(fen)布(bu);水(shui)(shui)(shui)分(fen)干燥(zao)擴展至(zhi)50mm厚度時(shi)大約需33d-65d時(shi)間(jian),具體時(shi)間(jian)因(yin)配合比不同(tong)而(er)略有差異;石料(liao)生產(chan)線(xian)(xian)骨料(liao)混凝(ning)(ning)土(tu)干縮值(zhi)與同(tong)條件下失水(shui)(shui)(shui)量(liang)(liang)之間(jian)并(bing)(bing)不是(shi)簡單的(de)線(xian)(xian)性(xing)關系(xi)。