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膨脹劑摻量和含鋼率對鋼管混凝土徐變性能影響試驗研究*
楊陽,王起才,張戎令,祁璐帆
摘 要
(蘭州交通大學土木工程學院, 蘭州 730070)
 
[摘要]為了研究膨脹劑摻量和含鋼率對鋼管混凝土徐變性能的影響,在(20±1)℃、相對濕度(60±5)%時,測試30%荷載水平下,膨脹劑摻量分別為0%,4%,8%以及含鋼率分別為0.038,0.066,0.092時鋼管混凝土的徐變應(yīng)變。試驗結(jié)果表明:含鋼率一定時,徐變應(yīng)變隨著膨脹劑摻量的增加而降低。膨脹劑摻量一定時,徐變應(yīng)變隨著含鋼率的增加而降低。將徐變試驗后的鋼管混凝土進行切割,對其核心混凝土采用孔結(jié)構(gòu)測試儀進行微觀結(jié)構(gòu)觀測,分別進行了氣泡數(shù)目、氣泡弦長、硬化混凝土空氣含量等的觀測。觀測結(jié)果表明:鋼管混凝土摻入膨脹劑后,在鋼管的限制作用下,核心混凝土更加密實,其構(gòu)件強度提高,從而使其徐變應(yīng)變降低。
[關(guān)鍵詞]鋼管混凝土; 膨脹劑摻量; 含鋼率; 徐變
中圖分類號:TU398      文獻標識碼:A      文章編號:1002-848X(2014)22-0041-04
 
Experimental research on influence of expansive agent proportion and steel proportion on creep characteristics of concrete filled steel tube
Yang Yang, Wang Qicai, Zhang Rongling, Qi Lufan
 (School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China)
 
Abstract:The specific creep strain of concrete filled steel tube incorporated with expansive agent proportion of 0%, 4%, 8% and steel ratio of 0.038,0.066,0.092 was tested under stress strength ratios of 30% in order to clarify the effect of expansive agent proportion and steel ratio on creep behavior. The tests were made under controlled temperature (20±1)℃and humidity (60±5)% conditions. Test results show that the creep strain of concrete filled steel tube decreases with the increase of expansive agent proportion at constant steel ratio and also decreases with the increase of steel ratio at constant expansive agent proportion. At the same time after creep test of concrete filled steel tube through cutting, micro-structure observation of core concrete was carried out by pore structure tester, including the number of air bubble, length of bubble chord, air content of hardened concrete observation, and etc. Observation shows that when concrete filled steel tube is mixed with expansive agent, under the action of the limitations of the steel tube, core concrete is more compact, the component strength increases, thus the creep strain of the component decreases.
Keywords:concrete filled steel tube; expansive agent proportion; steel ratio; creep
*長江學者和創(chuàng)新團隊發(fā)展計劃項目(IRT1139), 蘭州交通大學青年科技基金項目(2012028)。
作者簡介:楊陽,碩士研究生,Email:1027406080@qq.com。
 
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