第十一期_2013_《混凝土與水泥制品》雜志社

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第十一期

基于混沌反演算法的碾壓混凝土自生體積變形預測試驗研究

宋軍偉1,2

２０13年第11期

摘要

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摘要：在試驗觀測碾壓混凝土自生體積變形資料的基礎上,從物理學角度應用混沌動力學理論研究了變形的運動問題。通過相空間反演建模技術,建立的相空間變形動力模型反映出動力系統出現混飩行為。對變形運動的短期演化進行了模擬和預測。實例表明,該方法是可行的。 Abstract: Based on the trial observation data of autogenous volume deformation of roller compacted concrete (RCC), the motion problem of autogenous volume deformation is studied by means of non-linear dynamics from the physics view. The motion model of deformation with reconstruction of phase space is put forward and shows the chaos behavior in the dynamics system. The motion evolution characteristics of deformation dynamical systems on short-term are simulated and predicted. The example proves that the method is feasible.

不同水泥對脫硫建筑石膏膠凝材料性能和微觀結構的影響

勞有盛1，楊久俊1,2，張磊1，王雪平1，余海燕1

２０13年第11期

摘要

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摘要：主要研究鋁酸鹽水泥（AC）、普通硅酸鹽水泥（OPC）對脫硫建筑石膏膠凝材料水化后微觀結構與性能的影響。試驗結果表明，單摻AC初、終凝時間最高分別延長至54.5min和64min，抗折強度和抗壓強度最高可分別增加到15.3MPa和43.6MPa；單摻OPC初、終凝時間最短分別為4min和5.5min，抗折強度和抗壓強度可分別最高增加到14.3MPa和36.3MPa；復合摻雜兩種水泥的凝結時間，抗折強度和抗壓強度介于單摻兩者之間。XRD和SEM的研究結果表明，摻水泥后形成了鈣礬石和團聚狀C-S-H凝膠，鈣礬石的填充作用和C-S-H凝膠的膠結作用是復合膠凝材料增強的原因。 Abstract：The mechanical properties and microstructure of flue gas desulfurization gypsum doped with aluminate cement (AC) and ordinary Portland cement (OPC) are investigated. Results show that the initial and final setting time are prolonged to 54.5min and 64min respectively, the flexural strength and compressive strength are increased up to 15.3MPa and 43.6MPa respectively doped with AC. And the initial and final setting time are only 4min and 5.5min respectively, the flexural strength and compressive strength are increased up to 14.3MPa and 36.3MPa respectively doped with OPC. The setting time, flexural strength and compressive strength are ranged between single doped when these two kinds of cement are doped at the same time. The ettringite (AFt) and C-S-H gel are observed in all samples. Filling the role of AFt and cementation of C-S-H gel are the reason for the composite cementitious material reinforced.

多因素影響再生混凝土性能試驗研究

朱從香1，楊鼎宜2，許飛3，王虹4，鄭娟3

２０13年第11期

摘要

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摘要：研究了水膠比、再生粗骨料取代率及超細摻合料（粉煤灰、礦粉）摻量對再生混凝土性能的影響。試驗結果表明，水膠比W/C為0.35、再生粗骨料取代率在50%時，再生混凝土性能較好；而粉煤灰和礦粉雙摻可以充分發揮“微骨料效應”和后期“火山灰效應”，細化孔隙結構，提高密實度，改善再生混凝土界面過渡區的微觀結構。 Abstract: The influences of the water-binder ratio （W/C）, replacement of recycled coarse aggregate by mass （RRC） and the super-fine mineral admixtures （fly ash and slag） on the performances of recycled concrete are studied. The experimental results show that the performances of recycled concrete are better when the W/C is 0.35 and RRC is 50%. The results also show that the pore structure and the compactness is better, the bond with aggregates and the micro structure of concrete are improved by adding fly ash and slag. Based on this way, the comprehensive macro properties of concrete are improved.

橡膠顆粒對再生混凝土氯離子滲透性影響研究

王文婧，許家文，劉元珍，李珠

２０13年第11期

摘要

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摘要：在再生混凝土中摻入廢舊汽車輪胎經處理后得到的橡膠顆粒，采用ASTM C 1202法對6組不同橡膠顆粒摻量的混凝土試件進行抗氯離子滲透性試驗。結果表明，再生混凝土中摻入橡膠顆粒拌合而成的混凝土具有很低的氯離子滲透性，28d氯離子擴散系數均小于1×10-8cm2/s，且氯離子擴散系數隨橡膠顆粒摻量的增加而減少。 Abstract: Mixing the rubber particles obtained from the processed automobile tire into the recycled aggregate concrete and adopting the method of ASTM C 1202, the resistance test to the penetration of chloride ions for the 6 groups of concrete specimens mixed with different quantities of rubber particles is carried out. Results show that the chloride ion penetration of the recycled aggregate concrete mixed with rubber particles is very low and all the chloride ion diffusion coefficients of 28 days are less than 1×10-8cm2/s, moreover, the chloride ion diffusion coefficient will decrease as the dosage of rubber particles increases.

超高強高性能混凝土的配制研究

王軍，程寶軍，賈麗莉，劉通

２０13年第11期

摘要

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摘要：研究了復合水泥粉體壓實體空隙率的變化規律，優化了混凝土膠材組分，并研究了膠料總量、水膠比對超高強混凝土工作性能和抗壓強度的影響。在以上研究基礎上，開展了沸石粉配制超高強高性能混凝土的試驗研究。結果表明，微珠摻22%，硅灰摻8%，復合粉體空隙率最低，堆積密度最大；膠凝材料總量700kg/m3，水膠比0.16時，混凝土抗壓強度最高，60d和90d抗壓強度分別達146.5MPa和159.7MPa；摻4%沸石粉配制的超高強混凝土60d和90d抗壓強度分別為136.7MPa和148.1MPa，比不摻沸石粉的混凝土抗壓強度分別降低約4.7%和6.0%，降幅較??；混凝土3d和7d自收縮值分別為萬分之0.91和萬分之1.82，比不摻沸石粉的混凝土分別降低約21.6%和11.7%，降低混凝土的自收縮作用明顯。 Abstract: The compacting voidage of composite powder pressure entities is studied, and the components of concrete cementing materials are optimized, and the influences of cementing material content, water binder ratio on the working performance and compressive strength of the ultra high strength concrete are researched. Based on the above study, the experimental study on preparation of ultra high strength concrete by zeolite powder is carried out. The results show that when the content of microsphere and silica fume are 22% and 8% separately, the system of microsphere-silica fume-cement composite achieves the densest packing density. When the total amount of cementitious material is 700kg/m3, and the water-cement ratio is 0.16, the compressive strength of concrete curing for 60d and 90d are 146.5MPa and 159.7MPa respectively. When adding with 4% zeolite powder, the compressive strength of concrete curing for60d and 90d are 136.7MPa and 148.1MPa respectively, with a smaller decline of 4.7% and 6.0% compared with concrete without zeolite powder. At the same time, the experimental results show that the autogenous shrinkage of concrete added with 4% zeolite powder curing for 3d and 7d are 91ppm and 182ppm respectively, reduced by 21.6% and 11.7% than concrete without zeolite powder, which significantly reduced the autogenous shrinkage of concrete.

蛋白質型發泡劑的制備及其對泡沫混凝土性能的影響

史星祥

２０13年第11期

摘要

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摘要：以雞毛為原料，采用Ca(OH)2水解法制備蛋白質型發泡劑，系統考察原料預處理、Ca(OH)2用量、水解時間與水解溫度對發泡劑泡沫性能的影響。并向該發泡劑中摻加正丁醇與粘性物質羧甲基纖維素鈉（CMC）進行復配改性，以改善發泡劑泡沫性能。最后使用4種不同類型發泡劑制備泡沫混凝土，研究其對泡沫混凝土強度以及孔結構的影響。結果表明，制備蛋白質型發泡劑最佳工藝參數為：Ca(OH)210g、水解溫度110℃、水解時間2h；復配改性時正丁醇與CMC摻量分別為0.2%、0.03%時，泡沫穩定性最好，1h泌水率由38.89%降至11.59%。以改性蛋白質型發泡劑制備的300kg/m3級泡沫混凝土，其強度相對其他3種發泡劑制備的要高，28d抗壓強度達到0.85MPa，且其孔徑在0.5mm左右，孔分布較為均勻規整。 Abstract: Protein foaming agent is produced by the method of Ca(OH)2 hydrolysis using chicken feather as the raw material, and the effects of pretreatment of raw material, mass of Ca(OH)2, hydrolysis time, hydrolysis temperature on the foam performance of the foaming agent are investigated systematically in this paper. The foam performance is further improved by compound modification with the addition of buryl alcohol and viscous substance sodium carboxy methyl cellulose (CMC). At last, the compressive strength and pore structure of foamed concrete prepared by four different kinds of foaming agent is also investigated. Results show that the best process parameters are 10g Ca(OH)2, hydrolysis temperature 110℃, hydrolysis time 2h. The simultaneous addition of 0.2% normal butanol and 0.03% CMC is proved the most effective to the foam stability, which presented its 1h bleeding ratio reducing from 38.89% to 11.59%. 300kg/m3 foamed concrete prepared by modified protein foaming agent with the 28d compressive strength 0.85MPa is founded to have higher strength than the others, and its pores distributed uniformly with the pore size 0.5mm.

改進的PHC管樁承臺抗震性能試驗研究

戎賢1,2 ，藺頗1,2，李艷艷1,2

２０13年第11期

摘要

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摘要：為了研究PHC管樁承臺的抗震性能，對四個不同改進措施的PHC管樁承臺試件進行低周往復加載試驗。分析了各試件的滯回性能、承載能力、位移、延性及耗能能力。研究結果表明，將樁身混凝土摻入鋼纖維可顯著提高PHC管樁的抗震性能；而樁身纏繞碳纖維布和樁身加非預應力筋的改進方式對提高PHC管樁的抗震性能影響不大。 Abstract: In order to study the seismic performance of PHC pile caps，the low cycle reciprocating loading tests are carried out on four specimens of PHC pile caps using different improvement measures. The hysteretic behavior, loading capacity, displacement, ductility and energy dissipation of these specimens are analyzed. The results show that the pile body concrete with steel fiber can significantly improve the seismic behavior of the PHC pile caps, but the pile body wrapped CFRP and the pile body concrete with non-prestressed reinforcement have little effect to improve the seismic performance of PHC pile caps.

長短結合水泥攪拌樁在某工程深厚軟土地基處理中的應用

厲見芬，代國忠，李書進

２０13年第11期

摘要

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摘要: 結合工程實例, 研究了長短結合水泥攪拌樁進行深厚軟基加固處理的設計理論和施工工藝，并進行了靜載試驗、取芯試驗及沉降觀測。結果表明，使用此類處理方法使該工程地基獲得了較好的加固效果，同時也具有一定的經濟優勢。 Abstract: Combining with an engineering case, the design theory and construction technology of long-short cement mixing piles for reinforcing the soft foundation are studied. And the results of the static load test, core test and settlement observation show that ground treatment effect are great by the method, and meanwhile, it has some economic advantages.

小型混凝土預制構件全干法養護技術研究

趙桐1，張晉緒2，丁衛清2，劉金陵3，蔡榮4

２０13年第11期

摘要

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摘要：對預制混凝土構件生產線全干法養護技術進行了分析研究。通過分析試驗數據，確定了預制構件入養護窯的時間、干養時間、自然養護時間等參數，有效保證了預制混凝土構件的成型質量。 Abstract：The dry heating curing technology for prefabricated concrete elements is analyzed. By analyzing the experimental data，the parameters such as the time for prefabricated components into the curing kiln，the time for dry curing，and the time for natural curing are determined, which ensures the forming quality of prefabricated concrete elements.

水泥基復合材料中傾斜橋聯纖維的細觀力學解法

臧華東1，孟雷2，于瑾3，汲野3，俞家歡3

２０13年第11期

摘要

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摘要：根據彎曲和拉伸組合作用下的單根纖維的受力狀態，提出了細觀變位約束模型以求解承受軸拉的隨機各向分布纖維增強混凝土的力學性能。將單根隨機纖維的理論解在三維空間進行積分運算，有效描述了受拉纖維混凝土開裂后的受力過程，并給出了復合材料拉伸應力與裂紋張開位移、纖維傾斜角的函數關系，繪制的合成纖維混凝土曲線與試驗結果有較好的一致性。 Abstract: According to the forced state of single randomly oriented fiber under the combined action of bending and stretching, using the meso-scale variable engagement model to get the mechanical properties of the fiber reinforced concrete under tensile loading is put forward. Meanwhile, the obtained theory value of the single fiber is done the integral on 3-D space, the forced state of the fiber concrete under tensile stress after cracking is discussed. And the functional relationship of tensile stress and crack opening displacement of the fiber concrete as well as inclined angle of fiber is described. The analytical results show that the model can preliminarily simulate the elastic pullout behaviour of inclined synthetic crack-bridging fiber, and the curve is consistent with the experimental result.

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