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    蘇州混凝土水泥制品研究院有限公司

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    第六期

    雙摻再生骨料混凝土工作性及力學性能試驗研究
    雙摻再生骨料混凝土工作性及力學性能試驗研究
    • 蘇林行1,郭遠新2,李秋義2
    2016年第6期
    摘要
    引用本文
    摘 要:為了解決環境污染與資源緊張的問題,利用建筑垃圾中的廢棄混凝土制備再生粗骨料和再生細骨料,分別按照不同的取代率替代天然骨料以雙摻的形式制備再生混凝土。研究結果表明,雙摻再生骨料混凝土的工作性及力學性能要差于天然骨料混凝土;隨著再生細骨料和再生粗骨料取代率的增大,其用水量顯著增多,各個齡期的抗壓強度逐漸降低,但這兩種性能均呈現出較好的線性關系;當雙摻再生骨料的取代率均達到100%時,相比天然骨料混凝土,其用水量增多22.1%,抗壓強度降低19.2MPa,線性相關系數均在0.942以上;再生混凝土應用時,雙摻再生骨料的取代率均不宜大于50%。Abstract: In order to solve the problem of environmental pollution and resource shortage, the recycled coarse aggregate and recycled fine aggregate were used to prepare the recycled concrete by the waste concrete in the construction waste, and it was prepared by replacing natural aggregate with different replacement ratio in the form of double-admixing. The research results show that, the workability and mechanical properties of the double-admixing recycled aggregate concrete are worse than that of natural aggregate concrete. With the increase of the replacement ratio of recycled fine aggregate and recycled coarse aggregate, the water consumption of the concrete is increased significantly, and the compressive strength of each age is reduced gradually, but the two kinds of properties show a good linear relationship. When the replacement ratio of recycled aggregate is 100%, compared to the natural aggregate concrete, its water consumption increased by 22.1%, the compressive strength decreased by 19.2MPa, and the linear correlation coefficient is above 0.942. In the application of recycled concrete, the replacement ratio of double-admixing recycled aggregate should not be greater than 50%.
    高原型泵送劑在共玉高速中的應用研究
    高原型泵送劑在共玉高速中的應用研究
    • 柯國炬1,王佳茜2,王志剛3,田 波1
    2016年第6期
    摘要
    引用本文
    摘 要:對比了不同氣壓下混凝土引氣劑的引氣性能,研究了摻加不同減水組分、引氣組分、生物膠和緩凝組分的混凝土在低壓和常壓下的可泵性。結果表明,高海拔下,大氣壓降低,混凝土引氣效果變差,含氣量降低,可泵性劣化。適當的引氣劑引氣可以改善混凝土的可泵性,但要考慮引氣劑在低氣壓下的作用效果。結合共玉高速高海拔情況開發的高原型泵送劑,可泵性良好,力學性能優良,保證了高海拔下泵送混凝土的施工質量。 Abstract: Compared with the entraining performance of air entraining agent at low pressure, the pumpability of concrete adding superplasticizer, air-entraining agent, retarding composition and biological glue at normal atmospheric pressure and low pressure were studied. The results showed that with high altitude, atmospheric pressure decreasing, the air entraining agent effect deteriorated, concrete air content decreased, and the pumpability deteriorated. Appropriate air bubbles are the significant measure to improve the concrete pumpability, but the effect of air-entraining agent at low pressure should be taken into. Combined the high altitude conditions of GoonYu highway, the plateau type pumping agent with excellent pumpbility and mechanical properties is developed, which can ensure the construction quality of concrete pumping at high altitude.
    混凝土表面電阻率與電通量的相關性研究
    混凝土表面電阻率與電通量的相關性研究
    • 張 賀,楊 輝,俞海勇
    2016年第6期
    摘要
    引用本文
    摘 要:采用四電極法測試了不同混凝土配合比試件的表面電阻率,分析了表面電阻率隨水灰比及膠凝材料配比的變化,并進一步對表面電阻率與電通量的相關性進行了回歸分析。試驗結果顯示,表面電阻率隨水灰比增大而減小,雙摻礦渣和粉煤灰時混凝土的表面電阻率較大,表面電阻率與電通量具有較好相關性。 Abstract: Surface resistivity(SR) of concrete specimen with different mix proportions was tested by Wenner four-probe measurement. The change of SR with water cement ratio and cementitious materials mix proportion was analyzed, and the relativity of SR and electric flux was discussed in this paper. The results show that, with water cement ratio increases, the SR decreases. When slag and fly ash both added in concrete, the SP of concrete is relatively high. SP and electric flux has good correlation.
    聚羧酸系減水劑組成與結構對水泥顆粒表面電性質的影響
    聚羧酸系減水劑組成與結構對水泥顆粒表面電性質的影響
    • 左彥峰1,王棟民2,李志坤3,高振國4,郭 群1,梅世剛4,劉建龍4
    2016年第6期
    摘要
    引用本文
    摘 要:以甲氧基聚乙二醇甲基丙烯酸酯(MAA-MPEG)和甲基丙烯酸(MAA)為主要原料,通過自由基共聚合反應制備了聚羧酸系減水劑,研究了減水劑的側鏈聚合度、MAA/MAA-PEG比、分子量以及時間對水泥顆粒Zeta電位絕對值的影響。結果表明,隨著側鏈聚合度的增加,Zeta電位絕對值逐漸增大至趨向恒定;大分子量減水劑有利于增加水泥顆粒的Zeta電位絕對值;摻高分子量聚羧酸系減水劑試樣的Zeta電位隨時間的延長逐漸增加,而摻低分子量減水劑試樣的則逐漸減??;增加減水劑分子中羧基單元的量可以增大水泥顆粒的初始Zeta電位絕對值,但隨著時間的延長,Zeta電位絕對值逐漸下降。 Abstract: Several polycarboxylate superpalsticizers(PC) were synthesized with methoxy polyethylene glycol methacrylate (MAA-MPEG) and methylacrylic acid (MAA) as the main raw materials through free radical copolymerization reaction. The influence of side chain, molecular weight and MAA/MPEG-MAA ratio on Zeta potential of cement particles was investigated. It was found that with the increase of the side chain polymerization degree, the absolute value of Zeta potential increased gradually to tend to a constant, large molecular weight of water reducing agent was helpful to increase cement particle Zeta potential absolute value, and Zeta potential of high molecular weight PC gradually increased with time elapsing, but with low molecular weight water reducing agent sample decreased, enlarging the amount of carboxyl unit of PC molecules increased cement particle initial Zeta potential absolute value, but with the extension of time, the absolute value of Zeta potential gradually declined.
    混凝土的耐久性及其提升對策
    混凝土的耐久性及其提升對策
    • 徐亞丁,王 玲
    2016年第6期
    摘要
    引用本文
    摘 要:混凝土的耐久性決定了混凝土結構、構件的服役壽命,是混凝土材料至關重要的性能。針對近年來混凝土材料所面臨嚴峻的耐久性問題,本文從混凝土耐久性的影響因素出發,闡明了混凝土耐久性不足的原因,并從原材料選擇、配合比設計、生產控制等幾個方面提出了提升混凝土耐久性的對策。 Abstract: Durability is a crucial property of concrete which determines the length of service life of concrete structure and component. Aiming at severe problems of concrete durability in recent years, the reasons of durability insufficiency are elaborated and improvement measures in aspect of raw materials, mixing proportion design and production control are proposed in this paper.
    不同強度等級的混凝土碳化特性研究
    不同強度等級的混凝土碳化特性研究
    • 劉加敏
    2016年第6期
    摘要
    引用本文
    摘 要:采用加速碳化試驗,研究了不同強度等級、不同礦物摻合料的混凝土碳化規律,并采用掃描電鏡(SEM)、綜合熱分析法(TG-DSC)、壓汞法(MIP)對漿體中的微觀形貌、水化產物和孔結構進行了研究。結果表明,水灰比對混凝土的碳化深度影響較大,14d齡期時0.35水灰比混凝土的碳化深度僅為0.57水灰比混凝土碳化深度的25%;摻加30%粉煤灰混凝土抗碳化能力最小,不摻加礦物摻合料混凝土抗碳化能力最大;碳化后漿體密實度增加,孔徑細化,孔隙率分別降低21.8%和40.1%。 Abstract: Effect of strength grade and mineral admixture contents on the carbonation characteristics of concrete were investigated via accelerated carbonation method, the microstructure, hydration products and pore structure of concrete surface was analyzed by SEM、TG-DSC、MIP. The results show that the influence of ratio of water-cement on carbonation depth is higher, during the age of 14d, the carbonation depth of the 0.35 water cement ratio concrete is only 25% of the carbonation depth of the 0.57 water cement ratio concrete. The carbonation resistance of concrete was the minimum when the fly ash contents was 30%, and also the carbonation resistance of concrete without admixture was the maximum; the concrete structure compact increased, a large number of holes is refined after carbonation, and the porosity is decreased by 21.8% and 40.1%.
    水泥生產企業認識混凝土的幾個誤區
    水泥生產企業認識混凝土的幾個誤區
    • 尹國明1,張菊紅2
    2016年第6期
    摘要
    引用本文
    摘 要:針對水泥生產企業常見的幾個對混凝土認識方面的誤區進行了討論,分析了產生誤區的原因,提出了幫助水泥生產企業改進產品質量的措施,從而達到提升水泥產品質量、提高水泥生產企業對自身產品認知度的目的。 Abstract: According to the common misunderstandings of concrete of several cement enterprises, the discussion is carried out, the reasons for the misunderstandings are analyzed, the quality improving measures are proposed to help the cement enterprises, so as to improve the quality of cement products, and increase the awareness of the products.
    石屑在生態節能型高強高性能混凝土管樁中的應用
    石屑在生態節能型高強高性能混凝土管樁中的應用
    • 孫朝惜1,黃朝俊2
    2016年第6期
    摘要
    引用本文
    摘 要:將《石屑復合增強優化填充細骨料在生態節能型高強高性能管樁中的資源化利用》科研成果應用于管樁生產,以期生產一種節能型管樁。本文優化了石屑復合增強管樁混凝土配合比,研究了石屑摻量對管樁混凝土坍落度、強度、耐久性的影響,并結合實際應用效果得出,石屑作為復合增強填充細骨料可成功應用于管樁中。 Abstract: The research achievement of resource utilization of stone composite optimization filling fine aggregate in ecological and energy saving high performance concrete pile is applied in the production pipe. Here, the mix proportion of crushed stone composite reinforced pile concrete is optimized, and the effect of stone chips content on the slump, strength, durability of the pile concrete is studied. The actual application effect shows that stone chips as the composite reinforced fine aggregate filler can be successfully applied to the pile production.
    鋼板-鋼纖維混凝土檢查井蓋試驗研究
    鋼板-鋼纖維混凝土檢查井蓋試驗研究
    • 張紀剛,韓永力,胡先坤,蘇 銳
    2016年第6期
    摘要
    引用本文
    摘 要:基于高性能鋼纖維混凝土復合材料檢查井蓋及鋼-混凝土組合結構,提出了鋼板-鋼纖維混凝土井蓋。制作了2個階梯形純鋼纖維混凝土井蓋試件、1個部分包裹鋼板的平板式鋼板-鋼纖維混凝土井蓋試件和2個全包裹鋼的階梯形鋼板-鋼纖維混凝土井蓋試件,并進行了標準靜載試驗。結果表明,全包裹鋼板-鋼纖維混凝土組合結構形式的井蓋試件承載力高、豎向撓度較小,且在加載至超過400kN的過程中試件基本處于彈性范圍內,能夠滿足GB 26573—2011《鋼纖維混凝土檢查井蓋》中D級井蓋的承載力要求。 Abstract:Based on high performance steel fiber reinforced concrete composite material manhole cover and steel-concrete composite structure, the steel plate-steel fiber reinforced concrete manhole cover is designed. The standard static load test of the 2 stepped pure steel fiber reinforced concrete cover specimens, one partially encased steel flatbed-steel fiber reinforced concrete cover specimen and 2 full wrap steel ladder-shaped steel plate-steel fiber reinforced concrete cover are carried out. The results show that the load-carrying capacity of full wrap steel plate-steel fiber concrete manhole cover is high and its vertical deflection is small, and the specimen is elastic stage within the range of the load to the process of more than 400kN, which can meet the bearing capacity requirements of D level covers of GB 26573—2011“steel fiber concrete manhole cover”.
    在動荷載作用下單樁和群樁樁身軸力對比分析
    在動荷載作用下單樁和群樁樁身軸力對比分析
    • 李光明1,2,劉春原3,李明生2
    2016年第6期
    摘要
    引用本文
    摘 要:為了更準確找出在靜力條件下樁身軸力的遞變規律,以四樁模型下單樁所受荷載為標準,分別對單樁模型、雙樁模型、三樁模型的上部結構進行設計,使它們在靜力條件下單樁受力同四樁模型條件下的單樁受力相同,然后在不同地震波形及其相對應的不同加速度峰值條件下對這四類樁型進行數值模擬。研究結果表明,隨著地震加速度峰值的不斷增大,各樁型的軸力值也在逐漸增大,距樁頂5倍樁徑處軸力增加明顯;在同一地震峰值作用條件下,各樁型樁身軸力增量都在不斷減??;地震波與正弦波作用下的樁身軸力分布規律基本相同,正弦波下的各樁型樁身軸力值比地震波下的軸力值偏大。 Abstract: In order to find the alternation rule of pile axial force precisely, regarding the single pile load in four-pile model under static conditions as the standard, upper structures of the one-pile model, two-pile model, three-pile model are designed to make sure that the load of each pile of these models is the same as the load of single pile in four-pile model, and the numerical simulations for the four pile type are carried out under different seismic waveforms and different peak acceleration. The results show that axial force of each pile type increases gradually with the increasing of peak acceleration, and the pile axial force increases apparently at 5 times pile diameter to the top. At the same seismic peak value conditions, pile axial forces of all the four pile types decrease. In addition, the distribution rule of the axial force along the pile body under seismic function shows that the distributions of pile axial forces under seismic wave and sine wave are basically the same, but the pile axial force of the each pile body under sine wave is bigger.
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