本文選題：鋼纖維 + 輕骨料粘結(jié)　； 參考：《華北水利水電大學(xué)》2014年碩士論文

【摘要】：與普通骨料相比，陶粒具有優(yōu)異的性能，如密度低、孔隙率高、抗凍性良好、抗堿集料反應(yīng)優(yōu)異等。特別由于陶粒密度小、內(nèi)部多孔、形態(tài)成分均一、且具一定強(qiáng)度，，因而采用陶粒配制的混凝土具有質(zhì)輕，耐腐蝕，抗凍，抗震和良好的隔絕性等多功能特點。陶粒混凝土也在配合比、施工性能、力學(xué)和耐久性能等方面產(chǎn)生不同于普通混凝土的特點。但這種輕質(zhì)陶粒混凝土韌性要比普通混凝土差，在一定條件下限制了其發(fā)展。在輕骨料混凝土中摻入亂向分布的鋼纖維將明顯改善了輕骨料混凝土的抗拉強(qiáng)度、抗彎強(qiáng)度、抗裂性能和抗疲勞性能。本文從鋼纖維輕骨料混凝土與鋼筋的粘結(jié)性能入手，研究其主要影響因素，主要工作如下： 1、選用光面鋼筋制備鋼纖維輕骨料混凝土中心拉拔試件，避開鋼筋外形方面因素對鋼纖維陶�；炷琳辰Y(jié)性能的影響，研究鋼纖維陶粒混凝土與光面鋼筋粘結(jié)性能的影響因素。結(jié)果顯示：鋼纖維輕骨料混凝土與光面鋼筋的粘結(jié)性能優(yōu)于鋼纖維機(jī)制砂輕混凝土；鋼纖維摻量對鋼纖維輕骨料混凝土與光面鋼筋的粘結(jié)強(qiáng)度影響沒有明顯規(guī)律，這和鋼纖維普通混凝土與光面鋼筋的試驗結(jié)果一致，光面鋼筋與鋼纖維輕骨料混凝土的粘結(jié)性能受混凝土的組成成分、鋼筋表面粗糙程度等眾多因素相關(guān)。 2、選用變形鋼筋與不同強(qiáng)度等級的鋼纖維輕骨料混凝土制備試件，進(jìn)行中心拉拔試驗。結(jié)果顯示：鋼纖維輕骨料混凝土與變形鋼筋的粘結(jié)強(qiáng)度隨鋼纖維摻量和混凝土強(qiáng)度的增大而增大，細(xì)骨料采用機(jī)制砂的鋼纖維輕骨料混凝土雖然試件的抗壓強(qiáng)度得到明顯提高，但劈拉強(qiáng)度相差不大，粘結(jié)強(qiáng)度沒有明顯差異。從拉拔試件的破壞形態(tài)可以看出，粗骨料是拉拔破壞的薄弱面，因此提高粗骨料的強(qiáng)度，粘結(jié)強(qiáng)度也隨之提高。粘結(jié)長度的確定應(yīng)根據(jù)鋼筋的屈服長度和混凝土的極限粘結(jié)應(yīng)力綜合確定。
[Abstract]:Compared with ordinary aggregate, ceramsite has excellent properties, such as low density, high porosity, good frost resistance and excellent alkali aggregate reaction, especially because of small density of ceramsite, internal porous, homogeneous composition, and certain strength, so the concrete made of ceramsite is light in quality, corrosion resistance, frost resistance, aseismic and good isolation. The properties of ceramsite concrete are different from ordinary concrete in terms of mix ratio, construction performance, mechanics and durability. However, the toughness of this lightweight ceramsite concrete is worse than that of ordinary concrete. Under certain conditions, the development of the concrete is restricted in certain conditions. In light aggregate concrete, the disorderly distribution of steel fiber will be obviously improved. The tensile strength, bending strength, crack resistance and fatigue resistance of lightweight aggregate concrete are studied in this paper. The main influencing factors are studied from the bond properties of steel fiber lightweight aggregate concrete and steel bar. The main work is as follows:
1, the steel fiber reinforced lightweight aggregate concrete center drawing specimen is prepared by using the light surface reinforcement to avoid the influence of the steel shape factors on the bond property of the steel fiber ceramsite concrete, and the influence factors of the bond performance of the steel fiber ceramsite concrete and the light surface reinforcement are studied. The results show that the bond performance of the steel fiber lightweight aggregate concrete and the light surface reinforcement is excellent. The effect of steel fiber content on the bond strength of steel fiber lightweight aggregate concrete and light steel bar is not obvious. This is in accordance with the test results of steel fiber ordinary concrete and light surface reinforcement. The bonding properties of light steel and steel fiber lightweight aggregate concrete are composed of concrete composition and steel sheet. The degree of surface roughness is related to many factors.
2, the test specimens of steel fiber lightweight aggregate concrete with different strength grades are selected to carry out the central drawing test. The results show that the bond strength of the steel fiber lightweight aggregate concrete and the deformed steel bar increases with the increase of the steel fiber content and the strength of the concrete. The compressive strength of the parts is obviously improved, but the splitting tensile strength is not very different, and the bond strength is not obviously different. From the failure form of the drawing specimen, the coarse aggregate is the weak surface of the drawing failure. Therefore, the strength of the coarse aggregate and the bond strength are improved. The determination of the bond length should be based on the yield length of the steel bar and the concrete. The ultimate bond stress is determined synthetically.

【學(xué)位授予單位】：華北水利水電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU528

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