車橋耦合振動(dòng)對新拌混凝土力學(xué)性能的影響研究
發(fā)布時(shí)間:2018-08-12 16:38
【摘要】:采用室內(nèi)模擬振動(dòng)對新澆筑混凝土性能的影響,分析行車荷載引起的車橋耦合振動(dòng)作用對橋梁維修中新澆筑混凝土性能的影響,研究發(fā)現(xiàn):在混凝土凝結(jié)初期,不同組合振動(dòng)對混凝土7 d、14 d和28 d抗壓強(qiáng)度都有所提升,而在凝結(jié)中期與凝結(jié)后期,振動(dòng)組混凝土抗壓強(qiáng)度明顯低于靜置組,但隨著凝期的增長,強(qiáng)度損失有所降低;混凝土抗折強(qiáng)度與劈裂強(qiáng)度對微小裂紋與氣孔敏感性較強(qiáng),不同凝結(jié)時(shí)期,振動(dòng)組在抗折強(qiáng)度與劈裂強(qiáng)度均較靜置組低,尤其在凝結(jié)中期強(qiáng)度值減少明顯,兩種強(qiáng)度損失率均在8%~14%之間。同時(shí),隨著凝期增長,混凝土內(nèi)部水泥繼續(xù)進(jìn)行,對振動(dòng)產(chǎn)生的微小裂隙有一定"修補(bǔ)"作用,因此,后期抗折強(qiáng)度與劈裂強(qiáng)度損失有所彌補(bǔ)。
[Abstract]:The influence of indoor simulated vibration on the performance of newly cast concrete is analyzed. The effect of vehicle-bridge coupling vibration caused by driving load on the performance of newly cast concrete in bridge maintenance is analyzed. The compressive strength of concrete increased by different combination vibration at 14 days and 28 days, but the compressive strength of the vibration group was obviously lower than that of the static group, but the strength loss decreased with the increase of the setting period. The flexural strength and splitting strength of concrete are more sensitive to micro-cracks and pores. The flexural strength and splitting strength of vibration group are lower than those of static group at different setting stages, especially in the middle stage of setting. The loss rate of both kinds of strength is between 8% and 14%. At the same time, with the increase of the solidification period, the cement inside the concrete continues to be carried out, which has a certain "repair" effect on the tiny cracks produced by vibration. Therefore, the loss of the later flexural strength and the splitting strength is made up for.
【作者單位】: 重慶交通大學(xué)交通土建工程材料國家地方聯(lián)合工程實(shí)驗(yàn)室;重慶交通大學(xué)材料科學(xué)與工程學(xué)院;重慶交通大學(xué)土木工程學(xué)院;
【基金】:重慶市社會(huì)民生科技創(chuàng)新專項(xiàng)(cstc2016shmszx30010) 重慶交通大學(xué)交通土建工程材料國家地方聯(lián)合工程實(shí)驗(yàn)室開放基金(LHSYS-2016—012)和重慶交通大學(xué)研究生科研創(chuàng)新項(xiàng)目(20160103)資助
【分類號】:U441.3;U444
本文編號:2179642
[Abstract]:The influence of indoor simulated vibration on the performance of newly cast concrete is analyzed. The effect of vehicle-bridge coupling vibration caused by driving load on the performance of newly cast concrete in bridge maintenance is analyzed. The compressive strength of concrete increased by different combination vibration at 14 days and 28 days, but the compressive strength of the vibration group was obviously lower than that of the static group, but the strength loss decreased with the increase of the setting period. The flexural strength and splitting strength of concrete are more sensitive to micro-cracks and pores. The flexural strength and splitting strength of vibration group are lower than those of static group at different setting stages, especially in the middle stage of setting. The loss rate of both kinds of strength is between 8% and 14%. At the same time, with the increase of the solidification period, the cement inside the concrete continues to be carried out, which has a certain "repair" effect on the tiny cracks produced by vibration. Therefore, the loss of the later flexural strength and the splitting strength is made up for.
【作者單位】: 重慶交通大學(xué)交通土建工程材料國家地方聯(lián)合工程實(shí)驗(yàn)室;重慶交通大學(xué)材料科學(xué)與工程學(xué)院;重慶交通大學(xué)土木工程學(xué)院;
【基金】:重慶市社會(huì)民生科技創(chuàng)新專項(xiàng)(cstc2016shmszx30010) 重慶交通大學(xué)交通土建工程材料國家地方聯(lián)合工程實(shí)驗(yàn)室開放基金(LHSYS-2016—012)和重慶交通大學(xué)研究生科研創(chuàng)新項(xiàng)目(20160103)資助
【分類號】:U441.3;U444
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