Influence of freeze–thaw cycles and sulfate corrosion resistance on shotcrete with and without steel fiber
Influence of freeze–thaw cycles and sulfate corrosion resistance on shotcrete with and without steel fiber
复制标题
冻融循环和耐硫酸盐腐蚀性能对有钢纤维和无钢纤维喷射混凝土的影响
DOI：
10.1016/j.conbuildmat.2016.06.100
复制
发表时间：
2016-09
影响因子：
7.4
通讯作者：
Niu Ditao
中科院分区：
文献类型：
--
作者：
Wang Jiabin;Niu Ditao
低碱速凝剂喷射混凝土因水化过程与普通混凝土水化过程不同而具有终凝时间短、早期强度高、水化产物和微观结构多样等特点。在隧道运营过程中，喷射混凝土单层衬砌结构受到正负温交变和腐蚀离子，特别是硫酸根离子的作用。衬砌结构的耐久性和使用寿命受到严重威胁。本研究通过测试相对动弹性模量、质量损失率、腐蚀后力学性能等性能，研究喷射混凝土的抗冻、抗硫酸盐耐久性。然后，对腐蚀前后试样的矿物成分、热分析、孔隙结构和显微镜分析进行了表征。为了实现这一目标，制备了含钢纤维和不含钢纤维的普通混凝土和加速喷射混凝土。结果表明，在冻融循环和硫酸根离子侵蚀作用下，普通喷射混凝土比相同混合料的普通混凝土更耐用。因此，钢纤维导致喷射混凝土基体中具有相当致密的微观结构，并且可以显着提高早期抗压和劈裂拉伸强度。钢纤维喷射混凝土的抗冻、抗硫酸盐耐久性能最好。
Shotcrete with low-alkali accelerator has short final setting time, high early strength, and various hydration products and microstructures because of different hydration processes of ordinary concrete without accelerator. In tunnel operation processes, a shotcrete single-layer lining structure is subjected to positive and negative temperature alternation and corrosion ions, particularly sulfate ion. The durability and service life of the lining structure are seriously threatened.In this study, the performances, including relative dynamic elastic modulus, mass loss ratio, and mechanical properties after corrosion, were tested to investigate the shotcrete durability of frost and sulfate resistance. Then, mineral composition, thermal analysis, pore structure, and microscope analysis of the specimen before and after corrosion were characterized. To achieve this objective, ordinary concrete and accelerated shotcrete with and without steel fiber were fabricated. Results showed that ordinary shotcrete was more durable under the action of freeze–thaw cycles and sulfate ion attack than that of the ordinary concrete with the same mixture. Thus, steel fiber led to a considerably dense microstructure in the shotcrete matrix, and it could significantly improve the early-age compressive and splitting tensile strengths. Steel fiber reinforced shotcrete had the best durability performance in frost and sulfate resistance.
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影响因子：
--
作者：
Jong-Pil Won;Hwang-Hee Kim;Chang-Il Jang;Sang-Woo Lee
通讯作者：
Jong-Pil Won;Hwang-Hee Kim;Chang-Il Jang;Sang-Woo Lee
不同养护龄期加速喷射混凝土的微观结构、渗透性及力学性能
影响因子：
7.4
作者：
Jiabin Wang;DitaoNiu;Sha Ding
通讯作者：
Sha Ding
DOI：
10.4324/9780203028995
发表时间：
2008-10
期刊：
--
影响因子：
--
作者：
Alun H. Thomas
通讯作者：
Alun H. Thomas
DOI：
--
发表时间：
2005-09
期刊：
--
影响因子：
--
作者：
P. K. Mehta;P. Monteiro
通讯作者：
P. K. Mehta;P. Monteiro
影响因子：
11.4
作者：
Leung, CKY;Lai, R;Lee, AYF
通讯作者：
Lee, AYF