發(fā)布時間：2018-04-21 15:06

  本文選題：綠色生態(tài)混凝土 + 流變性能��； 參考：《中南林業(yè)科技大學》2015年碩士論文

【摘要】：綠色生態(tài)混凝土是一種性能介于普通混凝土和耕植土之間并具有及時調節(jié)生態(tài)平衡、美化環(huán)境景觀、實現(xiàn)人類與自然的協(xié)調的一種新型混凝土材料,也是我國建設資源節(jié)約型、環(huán)境友好型社會發(fā)展的必然要求。本文基于材料科學、生態(tài)學、植物學等基礎理論,借鑒傳統(tǒng)普通混凝土配合比設計方法的思想,以水泥基膠凝材料凈漿流變參數(shù)的優(yōu)選為切入點,深入探討了水膠比、材料組成及其摻量、高效減水劑等因素對綠色生態(tài)混凝土性能的影響規(guī)律；運用MATLAB軟件編程建立了原材料與其性能之間的相互關系；然后利用序列二次規(guī)劃法和MATLAB優(yōu)化工具箱,對綠色生態(tài)混凝土配合比設計的數(shù)學模型進行了優(yōu)化求解。主要研究結論如下：(1)單摻粉煤灰(FA)摻量在20%,-40%范圍內(nèi)變化時,隨著剪切速率增大,水泥基膠凝材料漿體呈現(xiàn)先剪切增稠后剪切變稀行為,且剪切增稠程度和剪切變稀程度均隨粉煤灰摻量增大而先降低后升高；單摻礦渣(SG)摻量在20%-40%范圍內(nèi)變化時,隨著剪切速率增大,漿體呈現(xiàn)先剪切變稀后剪切增稠行為,隨著礦渣摻量增大,剪切變稀程度逐漸升高,剪切增稠程度逐漸降低。(2)雙摻粉煤灰和礦渣的總摻量為30%、摻加比例在1：2～2：1范圍變化時,隨著剪切速率增大,漿體呈現(xiàn)先剪切增稠后剪切變稀行為,流變曲線的趨勢與單摻粉煤灰時的流變曲線趨勢類似,這表明粉煤灰對水泥基膠凝材料凈漿流變性能的影響比礦渣大得多；但是與單摻粉煤灰不一樣的是,隨著復摻粉煤灰摻量增加、礦渣摻量減少,漿體的剪切增稠程度和剪切變稀程度均逐漸降低。(3)基于Herschel-Bulkley模型,在水膠比為0.29的條件下,優(yōu)選出使膠凝材料體系符合綠色生態(tài)混凝土膠凝材料凈漿流變特性要求(即屈服應力值相對較小而粘度適中)的摻合料組合：粉煤灰與礦渣復摻且摻加比例為1：1或1：2。(4)基于泰勒公式,建立了粗骨料粒徑范圍為16.0-19.0mm和19.0-26.5mm時綠色生態(tài)混凝土的材料(水膠比、膠凝材料用量及組成、高效減水劑)與其性能(抗壓強度及孔隙率)的相互關系。(5)根據(jù)序列二次規(guī)劃法,基于MATLAB工具箱,以綠色生態(tài)混凝土28d抗壓強度、孔隙率為控制目標,在原材料用量的最佳取值范圍內(nèi),得出了粗骨料粒徑范圍為16.0-19.0mm和19.0-26.5mm時的綠色生態(tài)混凝土最優(yōu)配合比。(6)在水膠比為0.29條件下,選用粒徑范圍為19.0-26.5mm的粗骨料,優(yōu)化配制的混凝土28d抗壓強度可達9.1MPa,有效孔隙率可達27.8%,在其上播種狗牙根草種,成功配制出了綠色生態(tài)混凝土。
[Abstract]:Green ecological concrete is a kind of new concrete material whose performance is between ordinary concrete and tillage soil, which can adjust the ecological balance timely, beautify the environment landscape, realize the coordination between human beings and nature, and is also a kind of construction resource saving type in our country. Environment-friendly social development of the inevitable requirements. Based on the basic theories of material science, ecology and botany, and drawing lessons from the traditional design method of ordinary concrete mixture ratio, this paper takes the optimum selection of rheological parameters of cement based cementitious material as the starting point, and probes into the water-binder ratio. The effects of material composition and its content, high efficiency water reducer on the performance of green ecological concrete are studied. The relationship between raw materials and their properties is established by using MATLAB software, and then the sequential quadratic programming method and MATLAB optimization toolbox are used. The mathematical model of mix proportion design of green ecological concrete is solved optimally. The main conclusions are as follows: (1) when the content of fly ash + FAA) varies from 20% to 40%, with the increase of shear rate, the cement based cement paste exhibits shear thickening and then shearing thinning behavior. The shear thickening degree and shear thinning degree decreased first and then increased with the increase of fly ash content, and when the content of SGG increased in the range of 20-40%, with the increase of shear rate, the slurry showed shear thinning and then shearing thickening behavior. With the increase of slag content, the shear thinning degree increases gradually, and the shear thickening degree decreases gradually. The total content of fly ash and slag mixed with fly ash and slag is 300.When the addition ratio varies from 1: 2 to 2: 1, the shear rate increases with the increase of shear rate. The slurry shows shear thickening and then shearing thinning behavior, and the trend of rheological curve is similar to that of single fly ash, which indicates that the influence of fly ash on the rheological properties of cement based cement paste is much greater than that of slag. But different from single fly ash, with the increase of fly ash content, slag content decreases, the shear thickening degree and shear thinning degree of slurry decrease gradually.) based on Herschel-Bulkley model, under the condition of water-binder ratio 0.29, The optimal selection of the binder system meets the requirements for the rheological properties of green ecological concrete cement paste (that is, the yield stress is relatively small and the viscosity is moderate): the mixture of fly ash and slag is mixed with the ratio of 1:1 Or 1: 2. 4) based on Taylor's formula, In this paper, the relationship between the material (water-binder ratio, amount and composition of cementitious material, and superplasticizer) and its properties (compressive strength and porosity) of green ecological concrete with coarse aggregate particle size range of 16.0-19.0mm and 19.0-26.5mm is established according to the sequential quadratic programming method. Based on MATLAB toolbox, the green ecological concrete is controlled by 28d compressive strength and porosity in the optimum range of raw material dosage. The optimum mix ratio of green ecological concrete with 16.0-19.0mm and 19.0-26.5mm is obtained. When the water-binder ratio is 0.29, the coarse aggregate with the diameter of 19.0-26.5mm is selected. The compressive strength and effective porosity of the optimized concrete can reach 9.1 MPA and 27.8% respectively. The green ecological concrete is prepared successfully.
【學位授予單位】：中南林業(yè)科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU528

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本文編號：1782943