第十二期_2011_《混凝土與水泥制品》雜志社

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第十二期

復合激發劑對脫硫石膏－粉煤灰膠結材抗壓強度的影響

周可友1，潘亮1，郎營2，呂飛2

２０11年第12期

摘要

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摘要：研究了燃煤電廠兩大固體廢物脫硫石膏和粉煤灰在空氣自然養護條件下膠結反應特性，以粉煤灰改性未經煅燒脫硫石膏配制的新型石膏基膠結材，對影響脫硫石膏-粉煤灰膠結材的堿激發各因素進行了試驗研究，得出了各因素單獨作用時膠結材強度的發展規律。在此基礎上，通過正交試驗得到脫硫石膏-粉煤灰膠結材的最佳復合激發劑配比。此外，還研究了各激發劑對膠結材的影響機理及膠結材水化硬化機理。 Abstract: The solidifying reaction characteristics between two major solid wastes in coal-fired power plants, desulphogypsum and fly ash, are studied, while being naturally cured in the air. The factors affecting alkali excitation of desulphogypsum-fly ash cementitious material are researched by experiment according to the new gypsum cementitious material prepared by fly ash modifying non-calcined desulphogypsum. And the strength laws of desulphogypsum-fly ash cementitious material are carried out when each factor acts on the system alone. On the basis of this, by orthogonal experiment, the optimum proportion of composite activator of desulphogypsum-fly ash cementitious materiasl is obtained. Besides, the affecting mechanisms of exciting agents on cementitious material and the rule of hydration and hardening of cementitious material are analyzed and discussed.

新型鎂質膨脹材料的效能研究

張紅波1，高培偉1，李為康2，趙潔1

２０11年第12期

摘要

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摘??要：以富鎂尾礦為原料，經適宜工藝制備了新型膨脹材料，并研究了摻不同品種膨脹材料的水泥砂漿在不同齡期的力學性能以及在不同養護條件下的膨脹性能。結果表明，升高水化溫度對水泥砂漿前期膨脹速率的增加比較明顯，對水化后期影響較??；CaO含量高的膨脹材料早期膨脹率大，后期膨脹率??；當膨脹材料摻量在4%～6%時，水泥砂漿強度與變形可達到較好的平衡；新型膨脹材料具有持續穩定的膨脹性能，不存在無限膨脹和回縮現象。Abstract：Novelexpansiveagentsarepreparedbyusingrichmagnesiumtailingsthroughappropriatetechnology.Themechanicalpropertiesofmortarmixedwithdifferentexpansiveagentsunderdifferent?agesandtheexpansionpropertiesunderdifferentcuringconditionsareinvestigated.Resultsshowthatattheearlyage,theexpansionspeedincreasesobviouslywiththeincreaseofhydrationtemperature,butatthelaterage,thereisnoobviouseffectontheincreaseofexpansionspeed.Whentheamountofexpansiveagentsisincertaincircumstance,thehigherCaO,thehighertheearlyexpansionratioisandthelowerthelateexpansionis.Whenthedosagesofexpansiveagentsare4%～6%,thedeformationandstrengthofthemortarspecimenareinabetterbalance.Theexpansioncurveshowsthattheexpansionpropertiesoftheseexpansiveagentsarestablethroughthewholecourseofhydration,andthereisnoexcessiveexpansionandretraction.

噴砂防滑型（XPS）擠塑保溫板在渠道混凝土襯砌中的應用研究

雷淮平

２０11年第12期

摘要

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摘要：通過南水北調干渠工程實例，分析了渠道邊坡混凝土襯砌施工的具體情況，研究了噴砂防滑型（XPS）擠塑保溫板的防滑性能，提出了渠道邊坡混凝土襯砌施工質量提升的解決方案。 Abstract：Through the example of main canal engineering of South-to-North Water Transfer, the detailed situation of concrete lining construction in the side slope of canals is analyzed. The antiskid property of spray sand antiskid type (XPS) crowded plastic insulation board is studied, and the solutions on improving the quality of concrete lining construction in the side slope of canals are proposed.

建筑垃圾生產免燒磚技術研究

汪發紅1，李寧2

２０11年第12期

摘要

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摘要：研究了利用建筑垃圾、采用免燒免蒸工藝，生產免燒磚的技術。結果表明，建筑垃圾可全組分利用，且利用率可高達80%以上；不同使用年限的建筑垃圾對膠結材料的性能影響不大。 Abstract: Non-burned bricks can be made by construction wastes through non-burning and non-steaming process. The results show that the construction wastes can be all components utilization, and the utilization rate is up to over 80%. The effects of construction wastes with different service life on the performances of cementing materials are less.

某學?；炷帘咽鹿试蚍治? />
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<a href="/product/2254.html" target="_parent" class="title"><i class="iconfont12"></i>某學?；炷帘咽鹿试蚍治?/a>

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<span class="attrValue"><i class="iconfont2"></i> 王楓1，高波2</span>
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<span class="newMs">摘要：某學校宿舍樓梁、板、柱構件混凝土表面出現爆裂現象，通過對爆裂部分砂漿進行化學分析和混凝土安定性試驗，確定混凝土爆裂是由于在混凝土拌制過程中摻入的鋼渣中過燒氧化鈣、氧化鎂發生水化反應，體積膨脹造成的。

Abstract: The blowout phenomenon happened on the surface of concrete beams, plates and columns of one school dormitory building. Through the chemical analysis of the blowout part mortar and the stability test of concrete, the concrete blowout is caused by the volume expansion of the burned CaO, MgO of steel slag happening hydration during the concrete mixing process.</span>

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石粉部分替代水泥對機制砂干混砂漿力學性能的影響

劉桂鳳1，陳正發1，秦彥龍1，徐建民2

２０11年第12期

摘要

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摘要：用機制砂代替天然砂配制干混砂漿，可利用礦山尾礦作原料讓尾礦石變廢為寶，有效解決了尾礦環境污染問題；用機制砂中的石粉部分代替水泥不僅可以改善砂漿的性能，而且石粉部分替代水泥可以減少成本、節約資源。因此，研究石粉部分替代水泥對機制砂干混砂漿力學性能的影響具有重要的理論和經濟價值。本文通過室內試驗，研究了在不同替代率下石粉代替水泥對不同強度等級（M5,M10,M15,M30）的砌筑干混砂漿的7d和28d的抗壓強度和抗折強度等力學性能的影響。試驗結果表明，各強度等級的機制砂干混砂漿的7d和28d的抗壓強度和抗折強度隨石粉替代率的增加而降低，當替代率達到30%時，其抗壓強度和抗折強度降低的最為明顯。 Abstract: Using manufactured-sand replacing natural sand to prepare dry-mixed mortar can make the use of tailings and effectively solve the environment pollution of tailings. Stone powder of manufactured-sand partially replacing cement can not only improve the performances of dry-mixed mortar, but also reduce costs and save resources. Therefore, studying the effects of stone powder partially replacing cement on mechanical properties of dry-mixed mortar has important theoretic and economical values. In this paper, through the laboratory test, the influences of stone powder replacing cement with different replacing rates on 7d and 28d compressive strength and flexural strength of masonry dry-mixed mortar with different strength grades (M5, M10, M15, M30) are studied. The experimental results show that when the stone powder replacing rate increases, the 7d and 28d compressive strength and flexural strength of dry-mixed mortar with manufactured-sand with different strength grades will decrease, and when the stone powder replacing rate is 30%, the compressive strength and flexural strength decrease most obviously.

鋼筋混凝土梁損傷聲發射信號特征提取與識別研究

彭德紅1，孫德立2

２０11年第12期

摘要

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摘要：鋼筋混凝土橋梁暴露在惡劣工作環境下常常受到裂紋損傷威脅，及時有效地檢測到混泥土梁的微裂紋以及識別梁的損傷狀況是保證橋梁安全作業的重要基礎。針對目前采用全波形聲發射儀采集聲信號受到噪聲污染而影響探傷精度的問題，提出了基于神經網絡的非線性獨立分量分析(ICA)與維格納分布(WVD)的損傷聲發射信號特征提取與識別的新方法。通過RBF網絡估計混入聲信號中的非線性噪聲成分，利用ICA算法分離出真實的梁損傷聲信號，消除噪聲干擾，并應用WVD分析分離信號的時頻譜分布，提取信號特征頻率處的能量特征作為識別損傷狀態的有效參數。三點彎曲加載試驗結果表明，非線性ICA能夠有效抑制噪聲導致的聲信號頻率漂移，得到信號可靠的關鍵特征，提高梁裂紋損傷的識別精度，且結果比不進行去噪處理提高了9%。 Abstract：Reinforced concrete beams often suffer from cracks due to severe operation conditions. Therefore, it is imperative to monitor the beam condition in time to prevent damages. However, fault acoustic signal recorded by the waveform acoustic emission instrument is submerged by noise. To eliminate the noise, a new approach to identify the beam damages is presented. It firstly uses a RBF neural network to estimate the mixed nonlinear noise in the original acoustic signal, then the independent components analysis (ICA) is used to separate the true fault signal with the noise removed, lastly, the Wigner-Ville distribution (WVD) is adopted to extract distinct energy features of the separated signal in the time-frequency domain to realize the recognition of the beam health states. The three points bending loading test has been carried out to evaluate the proposed detection method. The experiment results show that the mixed noise can be eliminated effectively by the use of nonlinear ICA, and the identification precision is improved. Moreover, the performance of the proposed method is superior to the method without the ICA processing.

聚丙烯纖維RPC的力學性能研究

李月安

２０11年第12期

摘要

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摘要：對摻入聚丙烯纖維的RPC進行了力學性能分析，發現其抗壓強度具有較大幅度的提高，沖擊韌性也顯著增強；對其疲勞壽命進行線性回歸分析發現，疲勞壽命可以很好地服從兩參數Weibull分布；聚丙烯纖維可極大提高RPC的疲勞壽命。 Abstract: The mechanical properties of reactive powder concrete (RPC) with polypropylene fibers are analyzed and it shows that the compressive strength has improved greatly and its impact toughness is significantly enhanced. Linear regression analysis on its fatigue life shows that the fatigue life obeys the distribution of two-parameter Weibull well and the polypropylene fiber can improve the fatigue life of RPC greatly.

超長復合型纖維水泥混凝土最佳配合比試驗研究

姜麗偉

２０11年第12期

摘要

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摘要：采用正交試驗方法對超長復合型纖維水泥混凝土進行了最佳配合比試驗研究。選擇水灰比、砂率、纖維用量和減水劑用量四因素，每個因素四個水平進行試驗，并通過極差、均值等分析方法對于正交試驗結果進行了分析，得出了各因素及因素水平的變化對抗折、抗壓強度的影響，最后確定了超長復合型水泥混凝土的最佳配合比。 Abstract: The experimental research of optimal mix proportion is carried out for super-long complex fiber cement concrete by using the orthogonal testing method. Four influencing factros including water-cement ratio, sand ratio, dosages of fiber and water reducing agent are chosen to conduct the experiment with four levels for each factor. Through different analysis methods such as the range and mean, the orthogonal results has been analyzed, and the effects of each factor and its level changing on the compressive and flexural strength are obtained, and finally the optimal mix proportion of super-long complex fiber cement concrete is determined.

預應力高強混凝土管樁廠電氣節能設計

陸薇1，宋亞英2

２０11年第12期

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摘要：預應力高強混凝土管樁（PHC管樁）業是近年來快速發展的一個新興行業，PHC管樁廠的電氣節能有很大的潛力。結合混凝土管樁廠項目設計實踐，對電氣設計中各個環節的節能技術措施進行了研究探討。 Abstract: The industry of prestressed high-strength concrete piles(PHC piles) is one new industry developing rapidly in recent years. Electric energy saving design of PHC piles factory has great potential. Combining the design practice of concrete piles factory project, the energy saving technical measures of every link in electric design are researched and discussed.

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