- 摘 要
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（1 內(nèi)蒙古科技大學(xué)土木工程學(xué)院， 包頭 014010； 2 內(nèi)蒙古科大工程項(xiàng)目管理有限責(zé)任公司， 包頭 014010; 3 包頭鋁業(yè)集團(tuán)建安工程有限責(zé)任公司， 包頭 014046)
［摘要］對經(jīng)過0次、50次、100次、150次、200次凍融循環(huán)的再生混凝土（粗骨料取代率100%）進(jìn)行拉拔試驗(yàn)研究，以鋼筋直徑16mm和20mm、錨固長度5d和10d為變動(dòng)因素，分析凍融循環(huán)次數(shù)對再生混凝土立方體抗壓強(qiáng)度、極限拉拔荷載和極限黏結(jié)應(yīng)力的影響，并采用鋼筋開槽內(nèi)貼應(yīng)變片的方法，研究了不同凍融循環(huán)次數(shù)后鋼筋錨固段內(nèi)鋼筋應(yīng)變、局部黏結(jié)應(yīng)力和極限黏結(jié)應(yīng)力平均值-滑移的分布規(guī)律。結(jié)果表明，凍融循環(huán)后再生混凝土抗壓強(qiáng)度下降，極限荷載和極限黏結(jié)應(yīng)力平均值隨著凍融循環(huán)次數(shù)的增加而逐漸減??；隨著凍融循環(huán)次數(shù)的增加，荷載作用下鋼筋應(yīng)變沿錨固長度的變化曲線趨于平緩，局部黏結(jié)應(yīng)力首先在加載端附近出現(xiàn)應(yīng)力峰值，沿錨固長度逐漸向自由端傳遞，總體呈現(xiàn)減小的趨勢。
［關(guān)鍵詞］再生混凝土； 凍融循環(huán)； 拉拔試驗(yàn)； 黏結(jié)應(yīng)力； 黏結(jié)應(yīng)力-滑移
中圖分類號：TU375文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2018)09-0097-06
Pullout tests research on steel bars and recycled concrete after freeze-thaw cycles
Wang Chenxia1, Tang Leijie1, Zhang Zhanbiao2, Wang Jianjun3, Cao Fubo1
(1 School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China; 2 Inner Mongolia Keda Project Management Co., Ltd., Baotou 014010, China; 3 Baotou Aluminium Group Construction Co., Ltd., Baotou 014046, China)
Abstract:The pullout test research was carried out on recycled concrete containing 100% of recycled coarse aggregate under 0, 50, 100, 150 and 200 times of freeze-thaw cycles. Anchorage lengths of 5d and 10d of steel bar with diameters of 16mm and 20mm were taken as two variable factors to analyze influences of times of freeze-thaw cycles on cubic compressive strength, ultimate pullout load and ultimate bond stress. By embedding strain-gauge inside steel rebar, the steel bar strain, local bond stress and distribution laws of ultimate average bond stress-slip in steel bar anchorage section after different freeze-thaw cycles were studied. The test results show that the compressive strength of recycled concrete descends during the process of freeze-thaw cycle, and the ultimate load and ultimate average bond stress decrease with the increase of freeze-thaw cycles. The strain curve is flat with the increase of freeze-thaw cycles along the anchorage position under the breaking load. The local bond stress peak first appears near the loading end, and gradually moves to the free end, featuring the trend of decrease in general.
Keywords:recycled concrete; freeze-thaw cycle; pullout test; bond stress; bond stress-slip
*內(nèi)蒙古自治區(qū)自然科學(xué)基金項(xiàng)目(2016MS0547)，內(nèi)蒙古自治區(qū)高等學(xué)?？茖W(xué)研究項(xiàng)目(NJZY159)。
通訊作者：曹芙波,博士,教授, Email: caofubo@imust.cn。
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