發(fā)布時(shí)間：2018-04-24 22:08

  本文選題：低膠凝材料用量 + 自密實(shí)混凝土��； 參考：《深圳大學(xué)》2017年碩士論文

【摘要】：自密實(shí)混凝土(SCC)是依靠其自重作用而無(wú)需額外人工或機(jī)械振搗,在澆筑施工中具有大流動(dòng)性、勻質(zhì)性和抗離析性等優(yōu)異工作性能,且硬化后具備良好力學(xué)和耐久性能的高性能混凝土。然而SCC設(shè)計(jì)中通常膠凝材料含量較大,導(dǎo)致水化熱較高、硬化后收縮、徐變較大,且生產(chǎn)混凝土過(guò)程產(chǎn)生的CO2排放量較大將加重環(huán)境污染。為了實(shí)現(xiàn)SCC綠色生態(tài)化,本研究基于可壓縮堆積模型的顆粒堆積理論,設(shè)計(jì)出平衡工作及力學(xué)性能且符合環(huán)境效益的低膠凝材料用量綠色SCC�；谏鲜鰡�(wèn)題及目的,本研究具體內(nèi)容包括以下幾個(gè)方面:(1)基于可壓縮堆積模型的顆粒堆積理論,首先對(duì)凈漿、砂漿兩個(gè)體系進(jìn)行研究:分析了凈漿、砂漿兩個(gè)層級(jí)體系不同材料組成參數(shù)對(duì)堆積密實(shí)度的變化規(guī)律,同時(shí)從顆粒堆積的角度通過(guò)正交設(shè)計(jì)方法研究了不同材料組成參數(shù)對(duì)凈漿、砂漿流變性能的變化趨勢(shì),并通過(guò)固體顆粒濃度理論建立了砂漿堆積密實(shí)度與流變性能的關(guān)系模型,并為設(shè)計(jì)低膠凝材料用量的綠色SCC提供理論基礎(chǔ)。(2)在凈漿、砂漿堆積密實(shí)度對(duì)其流變性能影響的研究基礎(chǔ)上,通過(guò)正交設(shè)計(jì)方法研究了膠凝材料用量、砂率、超細(xì)砂粉與粉煤灰體積摻量等不同材料參數(shù)對(duì)混凝土堆積密實(shí)度的影響趨勢(shì),并以骨料與粉體體積比參數(shù)為橋梁,揭示了混合料堆積密實(shí)度對(duì)SCC工作性能的變化趨勢(shì)。在此基礎(chǔ)上,通過(guò)3種顆粒分布曲線模型配置的混凝土性能進(jìn)行對(duì)比分析,驗(yàn)證了經(jīng)CPM模型優(yōu)化后的SCC能夠取得工作性能與力學(xué)性能上的平衡,并進(jìn)一步研究了粉煤灰與納米TiO2復(fù)配的低膠凝材料用量綠色SCC性能。(3)通過(guò)堆積密實(shí)度與SCC性能的影響關(guān)系,得出了混合料堆積密實(shí)度t合理范圍為0.8150~0.8350,對(duì)應(yīng)的SCC滿足流動(dòng)性能要求,同時(shí)具備良好的間隙通過(guò)性及抗離析性能,且硬化后混凝土28天抗壓強(qiáng)度在35MPa以上,此時(shí)膠凝材料用量最低達(dá)到340 kg/m3,在此基礎(chǔ)上復(fù)摻5%納米TiO2,能夠配置出C40以上的低膠凝材料用量納米SCC。(4)基于可壓縮堆積模型及SCC性能研究,推薦了一種平衡工作及力學(xué)性能的低膠凝材料用量綠色SCC配合比設(shè)計(jì)方法,并對(duì)該方法的實(shí)用性和可行性進(jìn)行了驗(yàn)證。
[Abstract]:Self compacting concrete (SCC) is a high performance concrete with excellent working properties, such as large fluidity, uniformity and resistance to segregation in pouring construction, which is dependent on its self weight effect without additional manual or mechanical vibration, and has good mechanical and durable properties after hardening. However, in the design of SCC, the content of the cementitious material is large, resulting in the hydration heat. In order to realize the green ecology of SCC, this study is based on the theory of particle accumulation in the compressible accumulation model, and designs a green SCC. based on the low cementitious material for the balance work and mechanical properties and the environmental benefits in order to realize the green ecology of the CO2. The main contents of this study include the following aspects: (1) based on the theory of granular accumulation based on compressible accumulation model, first of all, two systems of pulp and mortar are studied. The changes in the accumulation density of different material parameters of the two layers of the mortar and mortar are analyzed, and the effect of the particle accumulation is also analyzed. The orthogonal design method studied the change trend of the rheological properties of the mortar and mortar by different material composition parameters. Through the solid particle concentration theory, the relationship model of the accumulation density and the rheological properties of the mortar was established, and the theoretical basis was provided for the design of green SCC with low cementitious material content. (2) the accumulation of mortar and the rheological properties of mortar on the rheological properties of the mortar. On the basis of the study of the performance influence, the influence trend of different material parameters, such as the amount of cementitious material, the sand rate, the volume of the superfine sand powder and the volume of the fly ash, is studied on the basis of the orthogonal design method, and the variation of the bulk density of the aggregate to the performance of the SCC is revealed. On this basis, the concrete performance of 3 kinds of particle distribution curve model is compared and analyzed. It is verified that the SCC can achieve the balance between the performance and mechanical properties after the CPM model optimization, and further studies the green SCC performance of the low cementitious material used for the combination of fly ash and nano TiO2. (3) through accumulation density In relation to the influence of SCC performance, it is concluded that the reasonable range of packing density of mixture t is 0.8150~0.8350, the corresponding SCC meets the flow performance requirements, and has good clearance and anti segregation performance, and the 28 day compressive strength of concrete is above 35MPa after hardening, and the minimum amount of cementitious material reaches 340 kg/m3 at this time, on this basis. With the addition of 5% nano TiO2, the amount of low cementitious material above C40 can be configured with nano SCC. (4) based on the compressible accumulation model and the study of SCC properties. A design method of green SCC mix ratio for low cementitious materials used in equilibrium and mechanical properties is recommended, and the feasibility and feasibility of the method are verified.

【學(xué)位授予單位】：深圳大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU528

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本文編號(hào)：1798461