基于凈漿流變性的自密實(shí)混凝土配合比設(shè)計(jì)方法研究
發(fā)布時(shí)間：2019-05-28 21:45
【摘要】：堆石混凝土已越來越多地應(yīng)用于水利工程中，為了滿足堆石孔隙的高填充率以保證堆石混凝土工程質(zhì)量，需要對(duì)其中自密實(shí)混凝土（SCC）的工作性能進(jìn)行嚴(yán)格控制，關(guān)鍵在于對(duì)SCC組成材料進(jìn)行合適的配合比設(shè)計(jì)。本論文的研究目的是基于SCC基本組成相——凈漿的流變性預(yù)測(cè)指導(dǎo)SCC工作性能，從而簡(jiǎn)化SCC配合比設(shè)計(jì)過程，節(jié)省工程實(shí)驗(yàn)的材料、時(shí)間和人力。 論文通過建立力學(xué)模型從物理本質(zhì)上分析SCC中砂漿流變性對(duì)石子受力運(yùn)動(dòng)情況及SCC工作性能的影響，并結(jié)合凈漿砂漿流變性之間的經(jīng)典關(guān)系，建立了凈漿流變性和SCC工作性能間的關(guān)聯(lián)。通過系列SCC和相應(yīng)水泥凈漿的性能檢測(cè)實(shí)驗(yàn)驗(yàn)證上述理論模型和關(guān)聯(lián)的正確性，提出基于凈漿流變性的SCC配合比設(shè)計(jì)方法。論文利用該方法成功配制出新型的純石粉SCC，驗(yàn)證了該方法的實(shí)用性和可行性，配制過程充分體現(xiàn)了該方法的簡(jiǎn)捷有效，實(shí)現(xiàn)了由凈漿流變性對(duì)SCC工作性能的預(yù)測(cè)指導(dǎo)，為SCC配合比設(shè)計(jì)提供了一種新的理念。 為了更好地指導(dǎo)SCC配合比設(shè)計(jì)過程中相關(guān)參量的調(diào)整、材料特性的控制和改進(jìn)，論文對(duì)凈漿流變性的影響因素——聚羧酸減水劑、水和水泥水化從作用機(jī)理上展開了研究。通過系列石粉凈漿實(shí)驗(yàn)并利用沉降天平法測(cè)量?jī)魸{中絮凝結(jié)構(gòu)粒徑分布，計(jì)算得到絮凝結(jié)構(gòu)表面覆蓋的水膜層厚度，這一厚度與凈漿流變性之間呈現(xiàn)一一對(duì)應(yīng)的強(qiáng)相關(guān)關(guān)系，能夠綜合體現(xiàn)聚羧酸減水劑和水兩個(gè)因素的影響作用，且由此指標(biāo)量化分析得到聚羧酸減水劑對(duì)凈漿流變性的調(diào)整改善效果更為有效。通過實(shí)驗(yàn)分析水泥凈漿流變性、聚羧酸減水劑吸附量、水泥水化產(chǎn)物隨時(shí)間的變化情況，得到單位表面積顆粒上減水劑吸附量與凈漿經(jīng)時(shí)流變性有較強(qiáng)正相關(guān)性的結(jié)論，為從材料特性方面進(jìn)行控制改進(jìn)，同時(shí)實(shí)現(xiàn)漿體流變性及其保持能力的需求提供理論基礎(chǔ)。 上述研究提出并驗(yàn)證了基于凈漿流變性的SCC配合比設(shè)計(jì)方法，并從機(jī)理上分析研究了凈漿中聚羧酸減水劑、水和水泥水化對(duì)凈漿流變性的影響作用，，為今后堆石混凝土工程中SCC的生產(chǎn)和工作性能調(diào)控提供簡(jiǎn)便、高效、合理的解決思路。
[Abstract]:Rockfill concrete has been more and more used in water conservancy projects. In order to meet the high filling rate of rockfill pores to ensure the quality of rockfill concrete engineering, it is necessary to strictly control the working performance of self-compacting concrete (SCC). The key is to carry on the suitable mix proportion design to the SCC composition material. The purpose of this paper is to guide the performance of SCC based on the prediction of the Rheology of SCC, which is the basic phase of slurry, so as to simplify the design process of SCC mix ratio and save the material, time and manpower of engineering experiment. In this paper, the physical essence of mortar in SCC is analyzed by establishing a mechanical model to analyze the effect of mortar Rheological properties on the force movement of stone and the working performance of SCC, and combined with the classical relationship between the Rheological properties of pure mortar. The relationship between the hemorheology of clean pulp and the working performance of SCC was established. The correctness of the above theoretical model and correlation is verified by a series of SCC and the corresponding cement paste performance test experiments, and a SCC mix proportion design method based on the Rheological properties of the paste is proposed. In this paper, a new type of pure stone powder SCC, was successfully prepared by using this method to verify the practicability and feasibility of the method. The preparation process fully reflects the simplicity and effectiveness of the method, and realizes the prediction guidance of the performance of SCC by the Rheological properties of the pure slurry. It provides a new concept for SCC mix design. In order to better guide the adjustment of related parameters and the control and improvement of material properties in the process of SCC mix design, the influencing factors of net slurry Rheological properties, such as polycarboxylic acid superplasticizer, water and cement hydration, were studied in this paper. The particle size distribution of flocculation structure in the slurry was measured by a series of stone powder pulp purification experiments and the sedimentation balance method was used to measure the particle size distribution of the flocculation structure. The thickness of the water film layer covered on the surface of the flocculation structure was calculated, and there was a strong correlation between the thickness and the Rheological properties of the slurry. It can comprehensively reflect the influence of two factors: polycarboxylic acid water reducer and water, and the quantitative analysis of this index shows that the effect of polycarboxylic acid water reducer on the adjustment and improvement of the Rheological properties of pure pulp is more effective. Through the experimental analysis of the Rheological properties of cement paste, the adsorption capacity of polycarboxylic acid water reducer and the change of cement hydration products with time, it is concluded that there is a strong positive correlation between the adsorption capacity of water reducer on particles per unit surface area and the time-dependent hemorheology of pure slurry. It provides a theoretical basis for the control and improvement of material properties and the need to realize the hemorheology and retention ability of slurry at the same time. The above research puts forward and validates the design method of SCC mixture ratio based on the Rheological properties of clean pulp, and analyzes and studies the effect of polycarboxylic acid superplasticizer, water and cement hydration on the Rheological properties of clean pulp from the mechanism point of view. It provides a simple, efficient and reasonable solution for the production and performance control of SCC in rockfill concrete engineering in the future.
【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU528
本文編號(hào)：2487383
[Abstract]:Rockfill concrete has been more and more used in water conservancy projects. In order to meet the high filling rate of rockfill pores to ensure the quality of rockfill concrete engineering, it is necessary to strictly control the working performance of self-compacting concrete (SCC). The key is to carry on the suitable mix proportion design to the SCC composition material. The purpose of this paper is to guide the performance of SCC based on the prediction of the Rheology of SCC, which is the basic phase of slurry, so as to simplify the design process of SCC mix ratio and save the material, time and manpower of engineering experiment. In this paper, the physical essence of mortar in SCC is analyzed by establishing a mechanical model to analyze the effect of mortar Rheological properties on the force movement of stone and the working performance of SCC, and combined with the classical relationship between the Rheological properties of pure mortar. The relationship between the hemorheology of clean pulp and the working performance of SCC was established. The correctness of the above theoretical model and correlation is verified by a series of SCC and the corresponding cement paste performance test experiments, and a SCC mix proportion design method based on the Rheological properties of the paste is proposed. In this paper, a new type of pure stone powder SCC, was successfully prepared by using this method to verify the practicability and feasibility of the method. The preparation process fully reflects the simplicity and effectiveness of the method, and realizes the prediction guidance of the performance of SCC by the Rheological properties of the pure slurry. It provides a new concept for SCC mix design. In order to better guide the adjustment of related parameters and the control and improvement of material properties in the process of SCC mix design, the influencing factors of net slurry Rheological properties, such as polycarboxylic acid superplasticizer, water and cement hydration, were studied in this paper. The particle size distribution of flocculation structure in the slurry was measured by a series of stone powder pulp purification experiments and the sedimentation balance method was used to measure the particle size distribution of the flocculation structure. The thickness of the water film layer covered on the surface of the flocculation structure was calculated, and there was a strong correlation between the thickness and the Rheological properties of the slurry. It can comprehensively reflect the influence of two factors: polycarboxylic acid water reducer and water, and the quantitative analysis of this index shows that the effect of polycarboxylic acid water reducer on the adjustment and improvement of the Rheological properties of pure pulp is more effective. Through the experimental analysis of the Rheological properties of cement paste, the adsorption capacity of polycarboxylic acid water reducer and the change of cement hydration products with time, it is concluded that there is a strong positive correlation between the adsorption capacity of water reducer on particles per unit surface area and the time-dependent hemorheology of pure slurry. It provides a theoretical basis for the control and improvement of material properties and the need to realize the hemorheology and retention ability of slurry at the same time. The above research puts forward and validates the design method of SCC mixture ratio based on the Rheological properties of clean pulp, and analyzes and studies the effect of polycarboxylic acid superplasticizer, water and cement hydration on the Rheological properties of clean pulp from the mechanism point of view. It provides a simple, efficient and reasonable solution for the production and performance control of SCC in rockfill concrete engineering in the future.
【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU528
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