本文選題：超高性能混凝土　切入點：HCSA　出處：《湖南大學》2014年碩士論文

【摘要】：超高性能混凝土（Ultra-High Performance Concrete，UHPC）是一種高強度、高韌性、低孔隙率的水泥基材料，作為一種新型的具備優(yōu)良性能的復合材料，必將成為未來一種極具應用價值的材料。 混凝土的收縮是指由于混凝土中所含水分的變化、化學反應及溫度變化等因素引起的體積縮小。收縮主要分為五大類，分別是塑性收縮、自收縮、干燥收縮溫度下降引起的溫度收縮以及碳化收縮。混凝土在收縮變形會產生拉應力，當拉應變超過混凝土的極限抗拉強度時會導致混凝土開裂，從而影響其使用性能和耐久性。 普通混凝土的收縮應力主要指干燥收縮引起的干縮應力；但超高性能混凝土，由于其低水膠比和礦物摻合料的大量摻入使其自收縮在總收縮中所占的比重較大。因此，對于超高性能混凝土的應用，找到控制混凝土出現(xiàn)收縮裂縫的方法就顯得十分重要。 摻加膨脹劑的補償收縮混凝土被廣泛應用于工程中，研究新型膨脹劑及其補償收縮混凝土的作用原理，工程需求量巨大。 本文選用高性能混凝土膨脹劑（High Performance Calcium Sulpho Aluminate，，HCSA）作為超高性能混凝土的外加劑，利用補償收縮原理，以達到減少超高性能混凝土收縮，減少開裂，提高超高性能混凝土的工作性能的目的。 為了更好的了解HCSA膨脹劑對超高性能混凝土性能的影響，本文主要研究了如下內容： (1)對加入膨脹劑HCSA的超高性能混凝土，通過測量不同膨脹種類、同種膨脹劑不同摻量和不同水膠比下的流動度和初凝時間，得到膨脹劑對超高性能混凝土工作性能的影響規(guī)律； (2)通過波紋管試驗測量不同膨脹劑種類、不同水膠比、不同膨脹劑摻量的超高性能混凝土基體的體積變化，得到膨脹劑對超高性能混凝土自收縮性能的影響情況； (3)通過混凝土收縮應變測試儀測量超高性能混凝土的體積變化，得到高性能膨脹劑HCSA對未添加鋼纖維及添加鋼纖維的超高性能混凝土有約束干燥收縮性能的影響情況； (4)通過測量不同摻量、不同水膠比、不同齡期的超高性能混凝土的抗折強度及抗壓強度，得到了膨脹劑HCSA對超高性能混凝土力學性能的影響情況；并通過電鏡試驗和差熱試驗，通過分析微觀結構分析，得到膨脹劑HCSA對超高性能混凝土力學性能的影響規(guī)律。最后，通過測量摻鋼纖維超高性能混凝土的抗壓強度，得出膨脹劑HCSA對摻鋼纖維超高性能混凝土強度的影響規(guī)律。
[Abstract]:Ultra-High Performance concrete (UHPC) is a kind of cement-based material with high strength, high toughness and low porosity. As a new type of composite material with excellent properties, it will become a kind of material with great application value in the future. The shrinkage of concrete refers to the volume reduction caused by the change of moisture content, chemical reaction and temperature change in concrete. The shrinkage is divided into five categories: plastic shrinkage, autogenous shrinkage, etc. When the tensile strain exceeds the ultimate tensile strength of concrete, it will lead to concrete cracking, which will affect the performance and durability of concrete. The shrinkage stress of ordinary concrete mainly refers to the dry shrinkage stress caused by dry shrinkage, but the proportion of autogenous shrinkage of super-high performance concrete in total shrinkage is larger because of its low water-binder ratio and large amount of mineral admixture. For the application of ultra-high performance concrete, it is very important to find the method to control the shrinkage crack of concrete. Contractive concrete with expansive agent is widely used in engineering. The function principle of new expansive agent and its compensating shrinkage concrete is studied, and the engineering demand is huge. In this paper, the high Performance Calcium Sulpho aluminum chloride (HPC) is used as the additive of UHPC, and the principle of compensating shrinkage is used to reduce the shrinkage and crack of UHPC. The purpose of improving the working performance of super high performance concrete. In order to better understand the effect of HCSA expansion agent on the performance of UHPC, the main contents of this paper are as follows:. 1) by measuring the fluidity and initial setting time of UHPC with different kinds of expansive agent, different amount of the same expansive agent and different water / binder ratio, the influence of expansive agent on the working performance of UHPC is obtained. (2) the volume change of the matrix of UHPC with different kinds of expansive agents, different water / binder ratio and different amount of expansive agent was measured by corrugated tube test, and the effect of expansion agent on the autosynthetic property of UHPC was obtained. 3) the volume change of UHPC was measured by concrete shrinkage strain tester, and the effect of high performance expansive agent (HCSA) on confined drying shrinkage of UHPC without steel fiber and steel fiber was obtained. 4) by measuring the flexural strength and compressive strength of UHPC with different dosage, water / binder ratio and age, the influence of expansive agent HCSA on the mechanical properties of UHPC was obtained, and the mechanical properties of UHPC were tested by electron microscope and differential thermal test. The influence of expansive agent HCSA on the mechanical properties of UHPC was obtained by analyzing the microstructure. Finally, the compressive strength of UHPC with steel fiber was measured. The influence of expansion agent HCSA on the strength of superhigh performance concrete with steel fiber was obtained.
【學位授予單位】：湖南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU528

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