資源描述:
《干旱寒冷地區(qū)水泥穩(wěn)定碎石基層材料性能研究(道路與鐵道工程專業(yè)優(yōu)秀論文)》由會員上傳分享,免費在線閱讀,更多相關(guān)內(nèi)容在教育資源-天天文庫。
1、摘要水泥穩(wěn)定碎石基層目前被廣泛應用于我國干旱寒冷地區(qū)高等級公路建設中,但在實際使用中它存在開裂的缺點。青海省干旱、早晚溫差大、全年低溫時間長是我國干寒地區(qū)的典型代表,因此本文針對青海省的環(huán)境特點,重點對水泥穩(wěn)定碎石材料的收縮特性、強度特性、組成設計方法進行研究,試圖進一步提高干寒地區(qū)水泥穩(wěn)定碎石基層的抗裂性能,改善路面的整體路用性能。論文綜合經(jīng)驗、理論計算以及干溫縮試驗,推薦出適合于干旱寒冷地區(qū)低收縮要求的骨架密實級配范圍、以及考慮環(huán)境因素的水泥用量確定方法。在此基礎上,對骨架密實級配混合料的低溫強度特性進行分析,建議干寒地區(qū)水泥穩(wěn)定碎石混合料設計時將凍融強度作為驗算強度,分析了外
2、加劑早強原理、并定性分析外加劑摻量的影響規(guī)律。最終,論文提出低收縮、低溫強度特性的干寒地區(qū)水泥穩(wěn)定碎石基層材料組成設計方法。綜上所述,本文對干旱寒冷地區(qū)水泥穩(wěn)定碎石基層進一步提高抗裂性能提供了指導性的理論基礎和操作方法。關(guān)鍵詞:骨架密實級配、收縮特性、強度特性、設計方法知識水壩為您整理AbstractAlthoughcementstabilizedmacadambaseiswidelyusedinhiigh—classhighwayconstructioninadd—coldregionofChina,ithasbeenfoundashortcomingofeasytocracki
3、npractice.Fortheenvironmentalcharactersofdrought,bigtemperaturedeferencefromthemorningtoevening,andlongtermlow-temperatureinQinghaiProvinceistypicalinChina,thispaperwillaimattheenvironmentalcharacteristicofQinghaiProvincetocompletethestudywithemphasisonmaterialshrinkagecharacteristics,strength
4、characteristics,andthedesignmethodsofcompositiontoimprovecrackresistanceofcementstabilizedmacadambasefurtherlyandtoimprovetheoverallpavementperformance.Integratedexperience,theoreticalcalculations,aswellasthedryingshrinkageandtemperaturetest,thepaperrecommendedaframeworkdensegradationrangefort
5、herequirementofanti·-crackinadd-·coldregion,andalsoaDeterminationMethodwithenvironmentalconsiderationstofixcementcontent.Onthisbasis,thepaperanalyzedthestrengthcharacteristicsunderlowtemperature,suggeuestingtomakethefreeze—thawstrengthasthestrengthcheckingincementstabilizedmacadammaterialdesig
6、nprocess.Also,theimprovementprincipleanalysisofadmixtureandqualitativeanalysisoftheimpactoftheadmixturecontentisanalyzedinpaper.Finally,thepaperrecommendedamixturecomposingdesignprocedureofcementstabilizedmacadambaseforlowshrinkageandstrengthcharacteristicsinlowtemperature.Inaword,thepapergive
7、soutthemeaningfultheoreticalbaseandoperationcontentsforthefurthercrackresistanceimprovementofcementstabilizedmacadammaterialinadd—coldregion.Keywords:frameworkdensegradationrange;shrinkagecharacteristic;sthrengthcharacteristic;designmet