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通过掺加不同粒径的橡胶颗粒研究水泥基灌浆材料的物理性能和力学性能。测试改性后水泥基灌浆材料的流动度、抗折抗压强度、24h竖向膨胀率和导热系数。试验结果表明,掺入橡胶颗粒可以部分提高水泥基灌浆材料的流动度和24h膨胀率,影响水泥灌浆材料的部分强度,但基本满足国家三类水泥基灌浆材料的强度要求,同时可以有效降低水泥基灌浆材料的导热系数,改善水泥基灌浆材料的保温性。综合水泥基灌浆材料的物理性能和力学性能,掺入橡胶组份D(即混合三种不同橡胶粒径的组份)的水泥基灌浆材料性能较好。 相似文献
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为解决灌浆材料在性能上存在的问题,向水泥基灌浆材料中掺入不同的外加剂,并完成新型高性能水泥基灌浆材料的配置。为验证水泥基灌浆材料的基本性能,对水泥基灌浆材料进行配置和性能测试。膨胀剂可提高水泥基灌浆材料的膨胀率,粉煤灰有利于提高水泥基灌浆材料的强度。最终选取6%的膨胀剂掺量作为水泥基灌浆材料的最佳掺量,并将粉煤灰的最佳掺量定为10%~15%。 相似文献
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矿物掺合料是半柔性路面用水泥基灌浆材料组分中的一种重要组成部分,为了探究其对半柔性路面用水泥基灌浆材料性能影响规律,采用单掺矿粉、硅灰和微珠三种矿物掺合料,测试了其水泥基灌浆材料流出时间与抗压强度,并借助XRD和SEM分析了矿物掺合料对灌浆材料水化产物组成与形貌的影响。结果表明:分别添加矿粉和硅灰时,二者均有助于改善水泥基灌浆材料力学性能,当硅灰掺量为2.4%时,其2 h、28 d抗压强度分别增加了1.6、9.8 MPa;微珠对改善水泥基灌浆材料流动性能效果明显,当微珠掺量为20%时,其5、20 min流出时间分别降低了10、15 s。3种矿物掺合料对水泥基灌浆材料早期水化产物的物相组成影响较小,单掺微珠和硅灰使硬化浆体更加密实,且微珠对水化产物钙矾石的形貌影响显著。综合分析3种矿物掺合料对水泥基灌浆材料的强度和流动性试验结果,得到矿粉、硅灰和微珠在灌浆材料组成中的最佳掺量分别为5%、1.6%、10%。 相似文献
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水泥基灌浆材料在设备安装灌浆、地脚螺栓锚固、混凝土结构加固修补等方面有广泛的应用。JC/T 986—2018《水泥基灌浆材料》行业标准自2018年09月01日正式实施,本文介绍了《水泥基灌浆材料》行业标准及制定过程,详细解读了标准中流动度、抗压强度、竖向膨胀率等技术指标,以便生产、施工、设计、使用单位更好的理解和执行该标准。 相似文献
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灌浆材料在工程中的应用已很普遍,诸如桥涵、隧道、矿井、大坝等工程。所使用的灌浆材料有多种,如甲凝、丙凝、氰凝、环氧等化学灌浆材料以及水泥基的无机灌浆材料。但由于化学灌浆材料不仅价格昂贵,对人体还有毒性危害及对环境造成污染,加之材料本身还有老化等问题,因此,在实际使用中尚推水泥基的灌浆材料为多。然而,水泥基的灌浆材料也存在着一些问题,例 相似文献
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低温条件下硅酸盐水泥基钢筋连接用套筒灌浆料试验研究 总被引:1,自引:0,他引:1
通过研究环境温度、拌和水温度、预养护时间及外加剂对套筒灌浆料工作性和力学性能的影响,探索了常温套筒灌浆料在低温环境下性能变化的趋势,为利用硅酸盐水泥制备低温套筒灌浆料提供试验基础。试验结果表明:常温套筒灌浆料不适宜用于低于5℃的温度环境;低温时,升高拌和水温度有助于提高灌浆料的早期强度,但处于负温时,灌浆料强度发展缓慢;预养护有助于提高低温时套筒灌浆料的早期强度;适量掺加防冻剂和早强剂可以提高套筒灌浆料早期强度,流动度随其掺量的增加而逐渐下降。综合考虑,4种外加剂中亚硝酸钠效果最好,其合理掺量为2.0%,碳酸锂效果最差。对于硅酸盐水泥基套筒灌浆料,在负温时难以通过单掺外加剂来获得较高的早期强度。 相似文献
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The purpose of the study is to obtain a cement grout with improved performance. The grout mixes of the present study contain cement, ultra-fine slag (UFS), super plasticizer and water. Properties like flowability, bleeding, compressive strength and shrinkage of cement grouts have been studied. Rheological parameters were also studied in order to explain the grout workability. The results show that, cement replacement with slag in grouts could reduce bleeding substantially without affecting the workability of the mixes. Introduction of slag enhanced the compressive strength and reduced shrinkage reasonably. Ultra-fine slag can be used as a supplementary cementitious material in cementitious grouts in order to improve the grout behavior. 相似文献
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通过测试2种不同水泥基低负温套筒灌浆料和1种常温套筒灌浆料在不同温度环境及养护方式下的流动度和抗压强度,对比研究了三者在低负温环境下的性能差异。结果表明,常温套筒灌浆料在低负温下极易被冻害,强度无法有效增长;掺激发剂的硅酸盐水泥基低负温套筒灌浆料可长期在低负温环境下养护,有良好的低温流动性,-5℃养护28 d抗压强度大于85 MPa;硫铝酸盐水泥基低负温套筒灌浆料只可在低负温环境下短期养护,再转标准养护后强度也能继续增长,-5℃养护7 d+标养28 d抗压强度可达85 MPa以上。 相似文献
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M. Axelsson G. Gustafson 《Tunnelling and Underground Space Technology incorporating Trenchless Technology Research》2010,25(1):1-8
One of the most crucial parameters for successful grouting is to ensure that the grout can penetrate the necessary apertures. For the most commonly used grout, cementitious grout, the available methods for determining the ability to penetrate apertures involves several measurements with different meshes or similar, which need to be evaluated. However, during the grouting process in the field there is rarely any time for evaluation and the most commonly used field method today stipulates a mesh width through which a certain volume need to pass. This implies that only an indirect measurement of the penetrability is performed. In order to perform direct and fast field measurements of the penetrability, a new, robust measuring device has been developed at Chalmers University of Technology in Gothenburg, Sweden. The device is named PenetraCone and the measuring part consists of a gap that is formed between two conical cylinders. The penetrability characteristics are measured by decreasing this gap as grout flows through. The gap is measured using a dial indicator gauge. Initial tests with the PenetraCone show that two characteristic gaps or widths can be evaluated. The width as the grout flow goes from continuous flow to dripping is termed bfilter and when the flow stops completely it is termed bstop. The parameter bfilter is related to the commencement of clogging or filtration of the cementitious grout. This means that for apertures larger than bfilter the cement passes unrestricted but for narrower apertures filtration will commence. This filtration process will occur in apertures down to bstop, which indicates the smallest aperture that the cement can pass through and for apertures below bstop the cement will not penetrate at all. The device is easy to use and the tests show that consistent values are obtained. The accuracy seems good enough for use as a control of the penetrability of cementitious grouts in the field. For use in production, the PenetraCone should be placed on the grouting rig, after the mixer, so that direct measurements can be performed on the grout that will actually be used for grouting. By relating the measured parameters to the penetrability requirements, quick decisions regarding the quality of the grout can be made directly on the grouting rig. 相似文献
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为研究钢筋套筒灌浆连接接头在地震作用下的连接性能,提高钢筋套筒连接接头的可靠性,设计并制备了钢筋直径25、28mm的钢筋套筒灌浆连接接头,通过高应力反复拉压试验,研究了钢筋套筒灌浆连接接头的破坏形态、连接性能、循环荷载对灌浆料的损伤情况,以及灌浆套筒应变分布等。试验结果表明:钢筋锚固长度约为8倍钢筋直径时,钢筋套筒灌浆连接接头的破坏形态均为钢筋拉断破坏,其强度可等同于同型号钢筋的抗拉强度,但套筒端部的灌浆料损伤严重,其损伤深度约占套筒总长度的8%,接头的屈服位移明显小于同型号钢筋的屈服位移。高应力循环作用对钢筋套筒灌浆连接接头连接性能影响不明显。采用屈服比、强度比、延性比和承载力能力利用比等指标对不同型号的钢筋套筒灌浆连接接头的连接性能进行评价,结果表明:钢筋套筒灌浆连接接头的屈服比和强度比均大于1,延性比均大于4,但是钢筋直径25mm的钢筋套筒灌浆连接接头的承载能力利用比仅为51%,可对其进行优化以降低接头对构件抗震性能的影响。 相似文献
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M. Axelsson G. Gustafson Å. Fransson 《Tunnelling and Underground Space Technology incorporating Trenchless Technology Research》2009,24(4):390-397
Cementitious grouts are the most commonly used grouting material in the world. The general concept of grouting is to propagate the grout in a sufficiently large volume in the grouted medium and hence to have a controlled penetration. This study has been performed in order to determine and test the different mechanisms that result in stoppage of the penetration of cementitious grouts. This is performed as sand column tests in a laboratory study, coupled with grouting in the field. The result shows that three different stop mechanisms can be identified depending on the ratio between the grain size of the grout and the available opening. At an opening up to three times the size of the largest grout grains, penetration does not occur due to clogging of the grains. For an opening larger than five times the largest grain the penetration is unrestricted and stoppage occurs due to equilibrium between the driving and resistance forces. Between these ratios, a transition area exists where the water content determines the penetrability and the stoppage is governed by a filtration process for the grout grains. This implies that grouting with higher water-to-cement ratios results in a larger penetration area and hence by applying the mixture-thickening method during grouting an increased sealing efficiency can be obtained. 相似文献