本文選題：抗裂硅質(zhì)防水劑　切入點：水泥水化　出處：《混凝土》2017年09期 　論文類型：期刊論文

【摘要】：通過CCD相機搭建試驗的數(shù)據(jù)采集系統(tǒng),以數(shù)字散斑相關(guān)方法對試驗中采集的散斑圖像數(shù)據(jù)進(jìn)行分析,研究混凝土試件硬化過程中試件表面變形場演化特征及其對后期受載破壞規(guī)律的影響。試驗結(jié)果表明:混凝土硬化變形時空演化表現(xiàn)為變形緩慢增加、變形快速增加、變形穩(wěn)定3個階段特征;混凝土硬化變形時空演化過程是一個從拉、壓區(qū)域不斷調(diào)整到最終穩(wěn)定的動態(tài)過程,調(diào)整過程中在受拉區(qū)形成損傷集中區(qū);混凝土硬化變形場空間演化特征表現(xiàn)為由不均勻分布演化為拉、壓應(yīng)變區(qū)域呈條狀相間的分布狀態(tài)。受載過程中裂紋在硬化變形受拉較大的區(qū)域開始發(fā)育,隨著荷載的增加裂紋沿著硬化過程中形成的條狀受拉區(qū)域擴展成宏觀裂紋且試件表面裂紋具有等距分布特征。
[Abstract]:The experimental data acquisition system is built by CCD camera, and the speckle image data collected in the experiment are analyzed by digital speckle correlation method. The evolution characteristics of the surface deformation field of concrete specimens during the hardening process and its influence on the law of post-loading failure are studied. The experimental results show that the space-time evolution of concrete hardening deformation shows a slow increase in deformation and a rapid increase in deformation. The space-time evolution process of concrete hardening deformation is a dynamic process from tension and compression region to final stability, and the damage concentration zone is formed in the tensile zone during the adjustment process. The spatial evolution characteristics of the hardening deformation field of concrete show that it evolves from uneven distribution to tension, and the compressive strain region presents a strip-like distribution state. During the loading process, cracks begin to develop in the areas where the hardening deformation is larger than that in the tensile region. With the increase of load, the crack propagates into macroscopic crack along the strip tensile region formed during the hardening process, and the crack on the surface of the specimen has the isometric distribution characteristic.
【作者單位】： 常州工學(xué)院;江蘇城工建設(shè)科技有限公司;江蘇省交通科學(xué)研究院有限公司;
【基金】：國家自然科學(xué)基金(51678083) 江蘇省產(chǎn)學(xué)研前瞻性聯(lián)合研究項目(BY2015029-01)
【分類號】：TU528
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本文編號：1649038