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(1 天津大學(xué)建筑工程學(xué)院,天津 300072; 2 廣州越秀城建國際金融中心有限公司,廣州 510620;3 廣東省建筑設(shè)計(jì)研究院,廣州 510010)
[摘要]針對C70,C80,C90高強(qiáng)鋼管混凝土,通過抽芯取樣、預(yù)埋試塊及間接養(yǎng)護(hù)對比試驗(yàn),探討不同齡期外界物理行為對高強(qiáng)混凝土強(qiáng)度的影響;并探討了不同養(yǎng)護(hù)條件下高強(qiáng)鋼管混凝土隨齡期強(qiáng)度發(fā)展規(guī)律。結(jié)果表明,高強(qiáng)鋼管混凝土強(qiáng)度對抽芯取樣等外界擾動(dòng)較為敏感,間接養(yǎng)護(hù)可模擬鋼管內(nèi)部混凝土的養(yǎng)護(hù)環(huán)境,其標(biāo)準(zhǔn)立方體試塊抗壓強(qiáng)度可作為判定鋼管混凝土強(qiáng)度的依據(jù)之一;隨著齡期的增長,鋼管的特定養(yǎng)護(hù)環(huán)境會(huì)使得混凝土強(qiáng)度后期增長較多,達(dá)到甚至超過標(biāo)準(zhǔn)養(yǎng)護(hù)和“同條件”養(yǎng)護(hù)的試塊強(qiáng)度。將試驗(yàn)研究成果應(yīng)用于實(shí)際工程,取得了滿意的效果。
[關(guān)鍵詞]高強(qiáng)鋼管混凝土;養(yǎng)護(hù)條件;齡期;強(qiáng)度;試驗(yàn)研究
Experimental study on strength developing regularities of high strength concrete filled steel tube
Meng Huanling1,2,Shang Jinguo3,Huang Weigang2(1 School of Civil Engineering, Tianjin University, Tianjin 300072,China; 2 Guangzhou Yuexiu Construction International Finance Center Co.,Ltd., Guangzhou 510620, China; 3 The Architectural Design and Research Institute of Guangdong Province, Guangzhou 510010,China)
Abstract:Based on C70, C80, C90 high strength concrete filled steel tube, the influence of external physical action on high strength concrete strength with ages were studied under the various conditions such as core pulling sample, pre-buried test block and indirectly curing, and the developing regularities under various curing conditions such were discussed. It is shown that the external physical action such as core pulling seriously influences on the strength of high strength concrete filled steel tube.The indirectly curing can simulate the inner curing environment of the steel tube, and the compressive strength of the standard cube test block under the indirectly curing condition can be the reference for judgment on the strength of high strength concrete filled steel tube.The later strength will be all along increasing with the ages for the specific curing condition, even over the strength under the curing conditions such as standard curing, same conditions curing. The satisfactory effect is got by application the above experimental results on the practical engineering.
Keywords:high strength concrete filled steel tube; curing conditions; age; strength; experimental study
作者簡介:孟煥陵,博士,工程師,Email:menghuanling1@163.com。
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