混凝土研究_2020_《混凝土與水泥制品》雜志社

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混凝土研究

不同水壓下混凝土斷裂能弱化效應試驗研究

胡少偉，王洋，孫岳陽，陸俊

2020年第12期

摘要

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摘 ? 要：為了研究混凝土在水力劈裂過程中的斷裂能變化規律，分析了水力劈裂中的各荷載做功，建立了水壓力下斷裂能的計算公式，開展了12組混凝土水力劈裂試驗，得出了水壓力對混凝土斷裂能的影響規律。結果表明：水壓力作用下混凝土的斷裂能減小，水壓力越大，混凝土的斷裂能越??；混凝土在水力劈裂過程中的斷裂能弱化效應不可忽略，在0.3 MPa水壓力下，該弱化效應隨水壓力增加呈線性遞增趨勢。 Abstract: In order to study the influence of water pressure on fracture energy of concrete under hydraulic fracturing, the work done by each load in hydraulic fracturing test was analyzed, the calculation formula of fracture energy under water pressure was established, and 12 groups of hydraulic fracturing tests of concrete were carried out. The results show that the fracture energy of concrete decreases under the action of water pressure, and the greater the water pressure, the smaller the fracture energy of concrete, which shows that the weakening effect of the fracture energy in the process of concrete hydraulic fracturing cannot be ignored, the weakening effect increases linearly with the increase of water pressure which not exceed 0.3 MPa.

胡少偉,王洋,孫岳陽,等.不同水壓下混凝土斷裂能弱化效應試驗研究[J].混凝土與水泥制品,2020(12):6-10. HU S W,WANG Y,SUN Y Y,et al.Experimental Study on Fracture Energy of Concrete Under Different Hydraulic Pressure[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):6-10.

粉煤灰對UHPC性能及微觀結構的影響

杭美艷1，孫忠科1，郭艷梅2

2020年第12期

摘要

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摘 ? 要：研究了粉煤灰取代量對超高性能混凝土（UHPC）的流動度、抗壓強度、抗折強度、微觀結構以及鋼纖維與基體黏結界面的影響。結果表明：粉煤灰取代量與混凝土流動度呈正相關；UHPC的抗壓強度隨粉煤灰取代量的增加呈先降低后升高的趨勢；UHPC的抗折強度隨粉煤灰取代量的增加呈先升高后降低的趨勢；通過SEM結果發現，隨粉煤灰取代量的增加，混凝土微觀結構的密實度呈先減小后增大的趨勢；UHPC基體與鋼纖維的黏結性能呈先增大后減小的趨勢。 Abstract: The effect of the replacecement amount of fly ash on fluidity, compressive strength, flexural strength, microstructure of UHPC and the bonding interface between steel fiber and UHPC matrix was studied. The results show that the replacement amount of fly ash is positively correlated with the fluidity of UHPC. The compressive strength of UHPC decreases first and then increases with the increase of the replacement amount of fly ash. The flexural strength of UHPC tends to increase first and then decrease with the increase of the replacement amount of fly ash. Through SEM scanning, it is found that the density of UHPC microstructure shows a decreasing trend with the increase of the replacement amount of fly ash and then increases. The bonding performance of UHPC matrix and steel fiber increases first and then decreases.

杭美艷,孫忠科,郭艷梅.粉煤灰對UHPC性能及微觀結構的影響[J].混凝土與水泥制品,2020(12):11-14,19. HANG M Y,SUN Z K,GUO Y M.Effect of Fly Ash on Property and Microstructure of UHPC [J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):11-14,19.

凍融損傷混凝土力學性能研究與等效凍融循環次數計算模型

齊檸1，戰美秋2，李梅1

2020年第12期

摘要

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摘 ? 要：為研究人工氣候環境下凍融損傷混凝土的力學性能退化規律，以凍融循環次數（FTCs）、混凝土強度為設計參數，共設計制作了21組混凝土試塊，先后對其進行凍融循環試驗與軸心受壓試驗。結果表明：隨凍融循環次數的增加，抗壓強度逐漸降低，且降低速率逐漸增大；不同強度等級混凝土的相對動彈性模量P均逐漸降低，且降低速率大致相等；隨設計混凝土強度等級的增大，相對抗壓強度增加，且增加速率逐漸增大；當凍融循環次數<100時，相對動彈性模量基本不變；當凍融循環次數>100時，相對動彈性模量則逐漸增大?；谠囼灲Y果，得到了不同凍融條件下的等效凍融循環次數計算模型，實現了不同凍融條件研究結果的相互利用與對比驗證。 Abstract: In order to study the degradation law of mechanical properties of frozen-thawed damage concrete in artificial climate, using the number of freeze-thaw cycles(FTCs) and concrete strength as design parameters, a total of 21 sets of cubic concrete test blocks were designed and manufactured. The freeze-thaw cycle test and the axial compression test were successively performed. The experimental results show that as the number of FTCs increases, the cubic compressive strength gradually decreases, and the decrease rate gradually increases. And the relative dynamic elastic modulus P of different strength levels gradually decreases, and the decrease rate is approximately equal. With the increase of design concrete strength grade, the relative compressive strength increases gradually, and the increasing rate increases gradually. The relative dynamic elastic modulus is basically unchanged when the number of FTCs is less than 100, and gradually increases when the number of FTCs is more than 100. Based on the test results, according to the principle of the same compressive strength loss, the artificial climate rapid freeze-thaw technique test conditions and the freeze-thaw conditions of "fast freeze method" are equivalent, and the calculation model of the equivalent FTCs under different freeze-thaw conditions is obtained, so as to realize the mutual utilization and comparative verification of the research results under different freeze-thaw conditions.

齊檸,戰美秋,李梅.凍融損傷混凝土力學性能研究與等效凍融循環次數計算模型[J].混凝土與水泥制品,2020(12):20-25. QI N,ZHAN M Q,LI M. Study on Mechanical Properties of Frost-damaged Concrete and Calculation Model of Equivalent Freeze-thaw Cycles [J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(11):20-25.

基于正交試驗的自密實重晶石混凝土配合比設計及性能研究

石建軍，凌顏，張志恒，劉華良，楊曉峰，王燦，張志君，李奇

2020年第12期

摘要

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摘 ? 要：采用重晶砂、重晶石作為自密實混凝土骨料，通過優化骨料級配、摻入適量的CRT玻璃粉和調整重晶石骨料比例等技術手段，成功配制出了工作性良好、表觀密度為3 200 kg/m3的自密實重晶石混凝土，并通過正交試驗研究砂率、水膠比和減水劑對混凝土工作性和抗壓強度的影響。結果表明：隨著砂率的增大，混凝土工作性降低，而抗壓強度逐漸增強；水膠比增大，V型漏斗時間和抗壓強度減少；減水劑用量增加可以提高混凝土的流動性，存在最佳摻量2.4%；使用功效系數法綜合分析得到了混凝土的最佳配合比為砂率45%，水膠比0.43，減水劑2.3%。 Abstract: Using heavy crystal sand and barite as aggregates of self-compacting concrete, the self-compacting barite concrete with good working performance and apparent density of 3 200 kg/m3 was successfully prepared by optimizing aggregate gradation, adding proper amount of CRT glass powder and adjusting the proportion of barite aggregate. The effects of sand ratio, water-binder ratio and water reducing agent on the workability and compressive strength of concrete were investigated by orthogonal test. The results show that as the sand rate increases, the working performance decreases, and the compressive strength gradually increases. As the water-binder ratio increases, the V-shaped funnel time and compressive strength decrease. As the amount of water reducing agent increases, the fluidity of the concrete increases first and then decreases, and there is an optimal content of 2.4%. The comprehensive analysis by the efficacy coefficient method is available. The best mix proportion is: sand rate 45%, water-binder ratio 0.43, water reducing agent 2.3%.

石建軍,凌顏,張志恒,等.基于正交試驗的自密實重晶石混凝土配合比設計及性能研究[J].混凝土與水泥制品,2020(12):15-19. SHI J J,LING Y,ZHANG Z H,et al.Mix Proportion Design and Performance Research of Self-compacting Barite Concrete Based on Orthogonal Test[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):15-19.

混凝土自崩實例分析

張亞濤，鄭繼，朱田生，徐良，吳超

2020年第12期

摘要

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摘 ? 要：基于工程實例中混凝土自崩現象，通過X射線熒光光譜分析、XRD分析和模擬試驗等對可疑物進行了辨別。結果表明：可疑物為鋼渣，其在混凝土中緩慢水化導致體積膨脹，最終造成表層混凝土自崩。同時，通過模擬試驗，分析了引起該類型混凝土自崩所需要的外部環境條件，并給出了防止該現象繼續發生的建議。 Abstract: Based on the phenomenon of concrete self-collapse in engineering examples, suspicious substances were identified through X-ray fluorescence spectrum analysis, XRD analysis and simulation tests. The results show that the suspicious substances are steel slag, which slowly hydrate in the concrete. It causes volume expansion and eventually causes the surface concrete to collapse. At the same time, through simulation tests, the external environmental conditions required to cause the concrete to collapse are analyzed, and some suggestions are provided to prevent this phenomenon from continuing.

張亞濤,鄭繼,朱田生,等.混凝土自崩實例分析[J].混凝土與水泥制品,2020(12):26-29. ZHANG Y T,ZHENG J,ZHU T S,et al.Analysis of Concrete Self-collapse[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(12):26-29.

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