本文選題：攪拌工藝 + 珊瑚混凝土　； 參考：《廣西大學》2017年碩士論文

【摘要】：本文主要研究了改進攪拌工藝(裹砂石法)對珊瑚、陶粒二種不同類型的多孔類骨料混凝土性能的影響,分析了其作用機理,并以石灰石混凝土作參照對比。主要研究內容與結果如下:檢測了珊瑚、陶粒、石灰石的吸水率、密度、空隙率、筒壓強度、壓碎指標、針片狀含量等物理性質,并針對多孔類骨料混凝土強度低的特點,確定以裹砂石法作為本文的改進攪拌工藝。通過檢測新拌混凝土的稠度、含氣量與泌水率,研究了改進攪拌工藝對多孔類骨料混凝土工作性能的影響,并分析了其作用機理。結果表明:改進攪拌工藝能夠提升混凝土的流動性,從而減少減水劑的用量;改進攪拌工藝能夠降低混凝土的含氣量,降幅隨著水灰比的降低而增大,其對多孔類骨料混凝土的作用效果強于石灰石混凝土;珊瑚混凝土與陶�；炷烈蚬橇厦芏鹊投谒畤乐�,石灰石混凝土無泌水現(xiàn)象,改進攪拌工藝能夠改善多孔類骨料混凝土的泌水率,水灰比越低,改善效果越佳。研究了粗骨料性能對混凝土抗壓強度的影響以及改進攪拌工藝對多孔類骨料混凝土抗壓強度與耐久性的影響。結果表明:三種混凝土抗壓強度由高至低依次為:石灰石混凝土陶�；炷辽汉骰炷�,與骨料強度排序相符,隨著水灰比的降低多孔類骨料混凝土與石灰石混凝土的強度等級差距進一步擴大;改進攪拌工藝能夠提升多孔類骨料混凝土的抗壓強度,低水灰比時,抗壓強度的提升幅度隨齡期的變化規(guī)律:早期不明顯,之后隨齡期增長快速增大,進入中后期小幅回落并趨于穩(wěn)定;高水灰比時,變化規(guī)律:增幅明顯且較為穩(wěn)定。在低水灰比時,改進攪拌工藝能夠明顯提升多孔類骨料混凝土的抗氯離子滲透性能與抗碳化性能,抗氯離子滲透性能的提升幅度隨著齡期的增長有所下降,抗碳化性能的提升幅度隨著齡期的變化保持穩(wěn)定,在高水灰比時,無明顯提升效果。通過壓汞測試(MIP)研究了改進攪拌工藝對多孔類骨料混凝土孔結構的影響,并對混凝土的抗壓強度、耐久性與孔結構進行了相關性分析。結果表明:改進攪拌工藝能夠降低多孔類骨料混凝土的孔隙率,水灰比越低效果越好,其中珊瑚混凝土的改善效果最佳,同類混凝土,孔隙率越低,抗壓強度越高;改進攪拌工藝能夠有效減少混凝土的有害孔,孔徑分布的改善幅度由大至小依次為珊瑚混凝土陶粒混凝土石灰石混凝土;改進攪拌工藝能夠明顯降低混凝土的孔體積,即降低孔的連通性,珊瑚混凝土的降幅最大,孔隙總體積與電通量存在較好的線性關系。
[Abstract]:In this paper, the effect of improved agitation process on the properties of porous aggregate concrete of two different types of coral and ceramsite is studied, and the mechanism of action is analyzed, and the reference of limestone concrete is compared. The main contents and results are as follows: the physical properties of coral, ceramsite, limestone, such as water absorption, density, void ratio, compressive strength, crushing index, needle content and so on, are tested, and the characteristics of low strength of porous aggregate concrete are analyzed. In this paper, the improved agitation process is determined by the method of sand and stone wrapping. By testing the consistency, gas content and bleeding rate of fresh concrete, the effect of the improved mixing process on the working performance of porous aggregate concrete was studied, and the mechanism of its action was analyzed. The results show that the fluidity of concrete can be improved and the amount of water reducing agent can be reduced by improving the mixing process, and the air content of concrete can be reduced by improving the mixing process, and the decrease increases with the decrease of water-cement ratio. Its effect on porous aggregate concrete is stronger than that on limestone concrete, coral concrete and ceramsite concrete are bleeding seriously because of low aggregate density, and limestone concrete has no bleeding phenomenon. Improving the mixing process can improve the bleeding rate of porous aggregate concrete, the lower the water-cement ratio, the better the effect. The influence of coarse aggregate properties on the compressive strength of concrete and the influence of the improved mixing process on the compressive strength and durability of porous aggregate concrete were studied. The results show that the order of compressive strength of three kinds of concrete from high to low is limestone concrete ceramsite concrete coral concrete, which is in accordance with the order of aggregate strength. With the decrease of water-cement ratio, the difference of strength grade between porous aggregate concrete and limestone concrete is further enlarged, and the compressive strength of porous aggregate concrete can be improved by improving the mixing process, and when the water cement ratio is low, the compressive strength of porous aggregate concrete can be improved when the ratio of water to cement is low. The increasing range of compressive strength is not obvious at the early stage, then increases rapidly with the age growth, and then decreases slightly and tends to be stable in the middle and late stage; at high water-cement ratio, the change law: the increase is obvious and more stable. When the water / cement ratio is low, the improved mixing process can obviously improve the chloride ion permeability and carbonation resistance of porous aggregate concrete, and the improvement range of chloride ion penetration resistance decreases with the increase of age. The improvement range of carbonation resistance remained stable with the change of age, and there was no obvious improvement effect at high water-cement ratio. The effect of improved mixing process on pore structure of porous aggregate concrete was studied by mercury injection test (MIP). The correlation between compressive strength, durability and pore structure of concrete was analyzed. The results show that the improved mixing process can reduce the porosity of porous aggregate concrete, and the lower the water-cement ratio, the better the effect. The better the improvement effect of coral concrete is, the lower the porosity of the same concrete is, the higher the compressive strength is. The improvement of mixing process can effectively reduce the harmful pore size of concrete, the improvement range of pore size distribution is coral concrete ceramsite concrete limestone concrete, the improved mixing process can obviously reduce the pore volume of concrete. That is to say, the decrease of coralline concrete is the biggest, and there is a good linear relationship between the total pore volume and the electric flux.
【學位授予單位】：廣西大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU528

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