本文選題：自密實混凝土　切入點：取代率　出處：《新疆大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：自密實混凝土（Self-Compacting Concrete，簡稱SCC）是具有高流動性、不離析、均勻性和穩(wěn)定性，澆筑時依靠自重，無需振搗而達(dá)到密實的混凝土。優(yōu)良的流動性為密集配筋結(jié)構(gòu)設(shè)計提供了可靠的技術(shù)保障，無需振搗減弱了工人的勞動強度并降低了施工噪音，配制時大量使用粉煤灰、高爐礦渣等固體工業(yè)廢料，有效提高了工業(yè)廢料利用率，減少環(huán)境污染。良好的工作性能使其在混凝土工程中具有重要地位，被認(rèn)為是今后高性能混凝土技術(shù)的發(fā)展方向之一。 目前對于自密實混凝土的研究較多，但由于自密實混凝土對原材料的敏感性，使得現(xiàn)在全世界范圍內(nèi)還沒有統(tǒng)一的自密實混凝土配合比設(shè)計方法。學(xué)者們對自密實混凝土的各項性能指標(biāo)（彈性模量、橫向變形系數(shù)和峰值應(yīng)變等）均進(jìn)行了研究，但是由于各地原材料的差異性，使得學(xué)者們的研究成果并不完全統(tǒng)一。本文擬采用烏魯木齊地區(qū)常用建筑原材料配制C30自密實混凝土，以原材料對自密實混凝土工作性能和力學(xué)性能的影響進(jìn)行研究，對C30自密實混凝土的基本力學(xué)性能進(jìn)行較為系統(tǒng)的研究，并對C30自密實混凝土簡支梁的受彎性能進(jìn)行試驗研究。 通過礦物摻合料對天水水泥的取代率試驗，得出烏魯木齊地區(qū)粉煤灰和礦粉對天山水泥的取代率。由粗骨料形狀指數(shù)和顆粒級配對自密實混凝土性能影響試驗，得出烏魯木齊地區(qū)粗骨料形狀指數(shù)和顆粒級配對自密實混凝土性能的影響規(guī)律。經(jīng)基本力學(xué)性能試驗，得到烏魯木齊地區(qū)C30自密實混凝土立方體抗壓強度、棱柱體抗壓強度、劈裂抗拉強度、應(yīng)力~應(yīng)變關(guān)系曲線。通過自密實混凝土簡支梁受彎試驗，驗證了自密實混凝土梁的平截面假定，得出自密實混凝土梁的開裂荷載、屈服荷載、彎曲剛度和正截面承載力等受彎力學(xué)性能指標(biāo)，為新疆地區(qū)自密實混凝土推廣應(yīng)用提供一定的參考。
[Abstract]:Self-compacting concrete (SCC) has high fluidity, no segregation, uniformity and stability, and depends on self-weight when pouring. The excellent fluidity provides reliable technical guarantee for the design of the dense reinforced structure, reduces the labor intensity of the workers and reduces the construction noise without vibration. Solid industrial waste, such as blast furnace slag, can effectively improve the utilization rate of industrial waste and reduce environmental pollution. Because of its good working performance, it plays an important role in concrete engineering and is considered to be one of the developing directions of high performance concrete technology in the future. At present, there are many researches on self-compacting concrete, but due to the sensitivity of self-compacting concrete to raw materials, There is no uniform design method of self-compacting concrete mixture ratio in the whole world. Scholars have studied the performance indexes (elastic modulus, transverse deformation coefficient and peak strain) of self-compacting concrete. However, due to the difference of raw materials, the research results of scholars are not completely unified. This paper intends to use common building materials in Urumqi region to prepare C30 self-compacting concrete. The influence of raw materials on the working and mechanical properties of self-compacting concrete is studied. The basic mechanical properties of C30 self-compacting concrete are studied systematically. The flexural behavior of C30 self-compacting concrete simply supported beam is studied experimentally. Through the substitution rate test of mineral admixture to Tianshui cement, the substitution rate of fly ash and mineral powder to Tianshan cement in Urumqi area is obtained. The effect of coarse aggregate shape index and particle gradation on the performance of self-compacting concrete is tested. The influence of coarse aggregate shape index and particle gradation on the properties of self-compacting concrete is obtained. The cube compressive strength of C30 self-compacting concrete and the compressive strength of prism in Urumqi region are obtained through the basic mechanical performance tests. Fracture tensile strength, stress-strain relationship curve. Through bending test of self-compacting concrete simply supported beam, the assumption of plane section of self-compacting concrete beam is verified, and the cracking load and yield load of self-compacting concrete beam are obtained. The flexural mechanical properties such as bending stiffness and normal section bearing capacity provide a certain reference for the popularization and application of self-compacting concrete in Xinjiang.
【學(xué)位授予單位】：新疆大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU375

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