本文選題：道路工程　切入點：水泥穩(wěn)定碎石　出處：《長安大學(xué)學(xué)報(自然科學(xué)版)》2017年04期

【摘要】：針對水泥穩(wěn)定碎石(簡稱水穩(wěn)碎石)等半剛性基層在青藏高原高海拔地區(qū)頻繁凍融循環(huán)作用下,易造成材料強度與耐久性下降,影響路面整體使用性能問題。以拉薩—貢嘎機場專用公路新建工程為依托,從水穩(wěn)碎石的抗凍融性能出發(fā),采用室內(nèi)試驗?zāi)M凍融循環(huán)過程,分析水穩(wěn)碎石經(jīng)不同次凍融循環(huán)作用后的強度損失規(guī)律,引入抗壓強度耐凍系數(shù)與劈裂強度耐凍系數(shù)作為抗凍融性能評價指標(biāo),對比分析水泥用量、養(yǎng)生溫度和凍融循環(huán)次數(shù)與水穩(wěn)碎石耐凍系數(shù)的相關(guān)性;以水穩(wěn)碎石耐凍系數(shù)為主參數(shù),水泥用量、養(yǎng)生溫度與凍融循環(huán)次數(shù)為變量,引入溫度修正系數(shù)對基層養(yǎng)生溫度影響進行修正,并對耐凍系數(shù)進行回歸,建立二元線性預(yù)測模型,計算模型計算值與試驗實測值的相對誤差,驗證模型的擬合精度。研究結(jié)果表明:水穩(wěn)碎石的強度與耐凍系數(shù)隨凍融循環(huán)次數(shù)的增加而降低,強度在0~5次凍融循環(huán)周期內(nèi)下降較為明顯;較高的水泥用量與養(yǎng)生溫度可有效降低水穩(wěn)碎石凍融后的強度損失,建議工程中控制水泥用量為4%(質(zhì)量分?jǐn)?shù),下同),同時保證養(yǎng)生溫度大于10℃可有效提高材料抗凍融性能;所建二元線性預(yù)測模型具有較高的擬合精度和很好的再現(xiàn)性,可為水穩(wěn)碎石抗凍融性能研究提供參考,為特殊地區(qū)半剛性基層設(shè)計施工提供技術(shù)指導(dǎo)。
[Abstract]:Under the action of frequent freeze-thaw cycles in high altitude area of Qinghai-Tibet Plateau, the semi-rigid base such as cement stabilized crushed stone (hereinafter referred to as water-stabilized crushed stone) will easily cause the decrease of material strength and durability, which will affect the overall performance of pavement.Based on the new highway construction project of Lhasa Gongga Airport, based on the freeze-thaw resistance of water-stabilized crushed stone, the laboratory test is used to simulate the freeze-thaw cycle process, and the strength loss law of water-stabilized crushed stone after different freeze-thaw cycles is analyzed.The freezing resistance coefficient of compressive strength and splitting strength were introduced as the evaluation index of freeze-thaw resistance. The correlation of cement dosage, curing temperature and freeze-thaw cycle times with freezing resistance coefficient of water-stabilized crushed stone was compared and analyzed.Taking the freezing resistance coefficient of water stabilized macadam as the main parameter, cement dosage, curing temperature and freeze-thaw cycle times as variables, the influence of temperature correction coefficient on the basic health preservation temperature was revised, and the freezing resistance coefficient was regressed.A binary linear prediction model is established to calculate the relative error between the calculated value and the experimental value, and to verify the fitting accuracy of the model.The results show that the strength and the coefficient of frost resistance of water-stabilized crushed stone decrease with the increase of freeze-thaw cycle times, and the strength decreases more obviously in the period of 0 ~ 5 cycles of freeze-thaw cycle.High cement content and health temperature can effectively reduce the strength loss after freezing and thawing of water-stabilized macadam. It is suggested that the control of cement dosage of 4 (mass fraction, the same as the following) in engineering can effectively improve the freeze-thaw resistance of the material.The binary linear prediction model has high fitting accuracy and good reproducibility. It can be used as a reference for the study of the freeze-thaw resistance of water-stabilized crushed stone and a technical guide for the design and construction of semi-rigid base in special area.
【作者單位】： 長安大學(xué)特殊地區(qū)公路工程教育部重點實驗室;沈陽公路路政管理局;
【基金】：“十二五”國家科技支撐計劃項目(2014BAG05B04) 交通運輸部建設(shè)科技項目(2013 318 490 010) 中央高校基本科研業(yè)務(wù)費專項資金項目(310821161015)
【分類號】：U416.214

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