第十期_2018_《混凝土與水泥制品》雜志社

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第十期

再生微粉性能對比試驗研究

蘭聰，羅杰，盧佳林，陳景，楊仕海

２０18年第10期

摘要

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摘要：研究了Ⅱ級粉煤灰、再生磚粉和再生混凝土微粉的基本性能，對比了再生磚粉和再生混凝土微粉替代Ⅱ級粉煤灰對混凝土工作性和力學性能的影響；并通過改性劑改善混凝土坍損過大的問題，分析了改性劑影響混凝土力學性能的機理。研究結果表明，再生磚粉和再生混凝土微粉在一定細度條件下，其性能與Ⅱ級粉煤灰相當；緩凝劑、激發劑以及部分表面活性劑組成的改性劑對工作性和力學性能具有明顯的改善作用；而水化鋁硅酸鈣對混凝土力學性能有較大的提高作用。 Abstract: The basic properties of the fly ash, recycled brick powder and recycled concrete powder are studied. The recycled brick powder and recycled concrete powder instead of fly ash in concrete preparation are compared. The influence on the working performance and mechanical properties are investigated. And by adding the modifier to improve the large concrete slump loss. The mechanism of change influence of modifiers on mechanical properties of concrete are analyzed. The results show that the performance of recycled brick powder and recycled concrete powder in certain fineness conditions is similar to fly ash. The retarder, activator and some surfactant composition modifier have obvious effect on the working performance and mechanical properties, the hydration calcium silicate aluminum can improve the mechanical properties of concrete obviously.

再生骨料在透水混凝土中的試驗研究

陳海，蔣元海，凌宏杰，熊小虎，何俊皓，應玲巧，吳淑偉

２０18年第10期

摘要

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摘要：采取正交試驗法研究了再生骨料摻量、水膠比、骨料顆粒級配三個因素對透水混凝土的強度和透水性的影響。結果表明，最佳配比為：再生骨料摻量40%、水膠比0.25，再生骨料由50%粒徑為4.75～9.5 mm的再生骨料和50%粒徑為9.5～16 mm的再生骨料混合組成，在該配比下制得的透水混凝土透水系數為6.3 mm/s，抗壓強度為23.1 MPa。 Abstract: Orthogonal text were adopted to study the effects of recycled aggregate content, W/B, aggregate particle size distribution on the strength and permeability of permeable concrete. The results show that the performance of permeable concrete is the best when the recycled aggregate content is 40%, the W/B is 0.25, and the amount of recycled aggregates of 4.75～9.5 mm and 9.5～16 mm is taking 50% part, respectively. The compressive strength and permcability coefficicnt of pervious concrete obtaied by the mix proportion is 23.1 MPa and 6.3 mm/s

改性高嶺土尾礦復合水晶廢渣在水泥基材料中的應用研究

孔贇，田焜，王月蘭，陶瑞鵬，向亞玲

２０18年第10期

摘要

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摘要：將經改性的高嶺土尾礦與水晶廢渣復合，等量取代水泥內摻到水泥基材料中，研究了摻入前后和不同摻量對水泥基材料的工作性、力學性能和體積穩定性的影響。并運用SEM等微觀測試手段，探討了其影響機理。結果表明，當改性高嶺土尾礦和水晶廢渣摻量為10%時，對水泥基材料的工作性影響不大，同時能夠提高砂漿的強度和體積穩定性，優化水化產物和水泥基材料的孔結構。 Abstract: The effect of modified kaolin tailings blended with crystal residues on performance on cement-based material, where the content of kaolin tailings and crystal residues mixture are varied by weight, is investigated. SEM is used to study the mechanism. The slump, strength and shrinkage of mortar mixes containing six different mixtures are tested. The results show that the strength and shrinkage performance significantly increases with the incorporation of 10% kaolin tailings and 10% crystal residues, meanwhile, the mixtures have little effect on the slump of mortar. On the other hand, kaolin tailings and crystal residues mixtures improve the hydration products and the pore structure of cement-based materials.

C50泵送頂升鋼管混凝土在市政橋梁中的應用

劉登賢，關素敏，吳鑫

２０18年第10期

摘要

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摘要：頂升自密實微膨脹鋼管混凝土可有效結合鋼管和混凝土的優勢且施工速度快、簡單方便，澆筑質量良好，因此，在高層建筑和橋梁工程中得到了廣泛應用。本文以市政橋梁泵送頂升項目為背景，分析了頂升自密實微膨脹鋼管混凝土的原材料選擇、配合比設計以及施工控制要點。 Abstract: The self-compacting micro-expansion pumping concrete filled steel tube can effectively combine the advantages of steel tube and concrete, and the construction speed is fast, simple and convenient, and the pouring quality is good. Therefore, it has been widely used in high-rise buildings and bridge engineerings. Based on the municipal bridge of pumping lift-up project, the raw material selection, mix proportion design and construction control key points of self-compacting micro-expansion concrete filed steel tube are analyzed .

超高工作性鋼管拱機制砂自密實混凝土的制備與工程應用

張弢1，袁政成2，蔣正武2，劉彬3

２０18年第10期

摘要

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摘要：為實現機制砂自密實混凝土在鋼管拱中獲得良好的應用，研究了機制砂自密實混凝土的最佳配合比，進行了現場模擬試驗，并提出了施工技術要點。試驗制備出初始坍落度大于270 mm、坍落擴展度大于700 mm、倒坍落度筒流出時間小于5 s、6 h內工作性基本無損失、具有一定補償收縮性能的鋼管拱機制砂自密實混凝土?，F場模擬試驗驗證了機制砂自密實混凝土可以無死角填充有機玻璃管。此外，經良好的現場施工組織與控制、澆筑過程監控，使得鋼管拱機制砂自密實混凝土在工程中成功應用。 Abstract: In order to achieve the better application of manufactured sand self-compacting concrete (MS-SCC) in steel pipe arch. The optimum mix ratio of MS-SCC was studied, field simulation tests were carried out and the key construction technologies were put forward. MS-SCC filled steel pipe arch was prepared with the properties such as initial slump more than 270 mm, slump flow above 700 mm, dropping time of concrete from inverted slump cone less than 5 s, 6 h slump zero-loss and shrinkage-compensating. Field simulation tests show that the MS-SCC can be completely filled with plexiglass pipes. By the good construction organization, control and perfusion process monitoring on-sit. MS-SCC can be applied in the steel pipe arch project successfully.

普通混凝土用石子壓碎指標測定試樣制備裝置設計

付希堯

２０18年第10期

摘要

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摘要：壓碎指標用于衡量石子在逐漸增加的荷載下抵抗壓碎的能力，是評定石子在建筑工程中適用性的重要力學性能指標。針對石子壓碎指標值測定試樣制備過程存在的不足，設計并研制了一種普通混凝土用石子壓碎指標值測定試樣制備裝置。通過自動化機電控制方式，利用PLC控制器來控制和驅動電機來完成整個試驗樣品制備過程，一定程度上可減少試驗人員的體力勞動的工作量，也可減小因經驗不足或操作水平低而產生試驗數據誤差概率 Abstract: The crushing index is used to measure the ability of gravel to resist crushing under increasing load, which is an important mechanical performance index for assessing the applicability of gravel in construction engineering. Aiming at the deficiency in the preparation process of the gravel crushing index values, a kind of specimen preparation device for the measuring of the crushed index values of regular concrete was designed and developed. By means of automatic electromechanical controlling, utilized PLC controller to control and drive the motors to complete the whole process of sample preparation, the workload of manual labor of the tester can be reduced to a certain extent. It can also reduce the error probability of experimental data due to lack of experience or low level of operation.

預制混凝土襯砌管片模具的改進研究

張金鐫，劉增喜，逄晨

２０18年第10期

摘要

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摘要：預制混凝土襯砌管片模具的設計過程較復雜，為了得到好的振搗效果，同時保證模具不因振動而開裂，使用有限元軟件ANSYS對模具進行了模擬分析，以此來輔助模具底板振搗梁的設計、振動器數量與位置的確定，從而使模具振搗設計達到更好的效果 Abstract：The design process of precast concrete lining segment die is rather complicated. In order to obtain good vibration effect, and ensure that the mould does not crack due to vibration, the design of vibration beam of mould bottom plate, and the number and position of vibrators, the finite element software ANSYS is used to analyze and simulate the mold, which can provide the better result of vibration design.

JC/T 2456—2018《預制混凝土箱涵》標準解讀

王春蓉1，高穎1，沈麗華1，褚建中2

２０18年第10期

摘要

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摘要：行業標準JC/T 2456—2018《預制混凝土箱涵》已于2018年9月1日開始實施。為了便于標準使用各方準確貫徹實施標準的具體要求和規定,本文介紹了JC/T 2456—2018標準的編制背景、編制目的和意義,并對標準的主要條款作了解釋和說明。 Abstract: The construction industry products industry standard JC/T 2456-2018 Precast concrete box culvert was officially issued,which was implement on September 1st,2018. In order to carry out and implement the specifications of the standard, the compilation background, compilation purpose and meanings of the standard are introduced.

?；⒅槟嫔皾{防結露試驗研究

涂沛1，程忠慶2，馬明丹3

２０18年第10期

摘要

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摘要：為研究?；⒅槟嫔皾{這種保溫材料的防結露效果，分別以普通砂和?；⒅闉楣橇?，制作普通水泥抹面砂漿和不同厚度的?；⒅槟嫔皾{與混凝土底板復合試件，放置于具有恒定溫濕度差的結露環境中，觀察發生結露的時間。試驗結果表明，?；⒅樯皾{的隔熱性與其表面的毛細吸水作用有益于延長其表面發生結露的時間，且結露時間隨砂漿厚度增加而延長。在給定試驗環境下，10 mm厚?；⒅樯皾{發生結露時間約為同等厚度普通水泥砂漿的10倍；15 mm厚的?；⒅樯皾{在試驗周期內表面未發生結露。. Abstract: In order to research the anti-condensation properties of the insulating material of glazed hollow beads surface mortar, ordinary sand and glazed hollow beads were used as aggregates to make composite specimens of ordinary cement surface mortar and glazed hollow beads surface mortar with different thickness, which were placed in the condensation environment with constant difference of temperature and humidity, the time of condensation was observed. The results show that heat insulation and capillary water absorption of the glazed hollow beads mortar are beneficial to prolong the dew condensation time on the surface, and which prolongs with incresing of mortar thickness. Under a given experimental environment, the dew condensation time of the 10 mm thick glazed hollow beads mortar is 10 times that of the ordinary cement mortars, the dew consendation does not occur on the surface of the 15 mm glazed hollow beads mortar during the experimental cycle.

全固廢泡沫混凝土性能研究

劉曉圣1，王美娜2，王振方3，聶京凱1，姬軍2，倪文2，陳新1，韓鈺1

２０18年第10期

摘要

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摘要：以鋼渣、礦渣、脫硫石膏為原料采用物理發泡的方法制備全固廢泡沫混凝土，研究了發泡劑稀釋比例和養護溫度對其抗壓強度影響。試驗表明，當發泡劑稀釋比例為1∶40，養護溫度為70 ℃時，體積密度為600 kg/m3的泡沫混凝土塊28 d抗壓強度可達到6.29 MPa。經掃描電鏡觀察水化產物發現有大量的鈣礬石生成。 Abstract: The solid foam concrete is prepared by physical foaming method with steel slag,powdered slag and desulphurization gypsum as raw materials. The influence of the dilution ratio and curing temperature of the foaming agent on the compressive strength of the concrete is studied. The experimental results show that when the dilution ratio of the foaming agent is 1∶40 and the curing temperature is 70 ℃, the 28 d compression strength of the foam concrete block with volume density of 600 kg/m3 can reach 6.29 MPa. A large number of ettringites is found by scanning electron microscopy.

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