第十一期_2018_《混凝土與水泥制品》雜志社

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第十一期

復合液體抗腐蝕劑對海洋混凝土性能的影響研究

李崇智1，章超1，肖維錄2，呂麗萍3，王夢宇1

２０18年第11期

摘要

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摘要：試驗研究對比了4種復合液體抗腐蝕劑FS-1~FS-4對水泥膠砂強度和混凝土的工作性、力學性能與耐久性的影響。結果表明：相對于空白樣，4種復合液體抗腐蝕劑均可提高水泥膠砂的抗折強度11.6%~13%，改善混凝土的工作性，提高混凝土28 d抗壓強度14%~15%；通過碳化試驗、抗氯離子滲透試驗以及模擬海水干濕循環試驗得出，4種抗腐蝕劑可以減緩混凝土碳化速率13.0%~21.7%，提高混凝土的抗碳化性能，6 h電通量降低23%~32%，有效降低海洋環境對混凝土強度和質量損失的影響。 Abstract: The effects of four kinds of composite liquid corrosion inhibitors FS-1~FS-4 on the strength of cement mortar and workability, mechanical properties and durability of concrete were studied.The results show that the flexural strength of cement mortar can be improved by 11.6%~13% and the workability of concrete can be improved by 14%~15% compared with the blank sample. Through carbonation test, chloride ion penetration test and simulated seawater dry-wet cycle test, the carbonation rate of concrete can be slowed down by 13.0%~21.7%, and the carbonation resistance of concrete can be improved. The electric flux of concrete can be reduced by 23%~32% after 6 hours. The chloride ion penetration resistance of concrete is improved, and the influence of marine environment on concrete strength and quality loss is effectively reduced.

混凝土裂縫自愈合研究進展綜述

武少赟，王立成

２０18年第11期

摘要

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摘要：為了探索裂縫自愈合對開裂混凝土結構耐久性的影響，結合已有文獻介紹了無損法和破損法兩種研究混凝土裂縫的方法，從材料、環境和裂縫因素三個方面闡述了它們對混凝土裂縫自愈合的影響，并且分別從宏觀、微觀和納觀層次上介紹了自愈合研究的評價指標，總結了混凝土裂縫自愈合研究的主要成果及需要深入研究的問題，以期為混凝土裂縫自愈合的研究提供借鑒。 Abstract: In order to explore the effect of self-healing on the durability in cracked concrete, two methods, i.e., the non-destructive method and destructive method for crack generation, were introduced. The mechanisms of self-healing were discussed. The influence factors of self-healing were described in details from three aspects: material, environmental and cracking parameters. Furthermore, the main evaluation indicators of self-healing in cracked concrete were pointed out from macro, micro and nano scale levels, respectively. The main achievements of self-healing in cracked concrete and the aspects that need further study were pointed out, which could provide a reference for the further research of self-healing of concrete crack.

內養護水引入方式對高性能混凝土強度的影響

張蕊1，葉成銀2，周永祥1，夏京亮1，高超1

２０18年第11期

摘要

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摘要：采用肯尼亞火山渣和高吸水樹脂作為內養護材料，研究了內養護水不同引入方式對C60高性能混凝土抗壓強度的影響。結果表明：①火山渣和高吸水樹脂對C60混凝土各齡期的抗壓強度均有不同程度的降低，其中，高吸水樹脂引入內養護水對抗壓強度的降低程度更大；②火山渣和高吸水樹脂對抗壓強度的降低程度隨著齡期的發展逐漸減小，甚至火山渣摻量較小時（104 kg/m3），其28 d抗壓強度近似等于基準組；③與內養護材料引入內養護水相比，簡單增加拌合水量對混凝土強度的不利影響更大。 Abstract: Using the Kenya volcano cinder and super absorbent polymer as internal curing materials, the influence of the modes in which internal curing water on compressive strength of C60 high performance concrete is studied. The results show that, the compressive strength of C60 concrete decreases after the introduction of internal curing water, but the decrease degree decreases gradually with the development of age, even in the later age, the compressive strength of C60 concrete with a small content of volcanic cinder is approximately equal to that of the reference mixture; compared with the internal curing water introduced by super absorbent polymer, the internal curing water introduced by volcanic cinder has less negative influence on compressive strength; compared with the internal curing water introduced by internal curing materials, increasing free mixing water simply affect strongly the compressive strength of concrete.

聚乙烯醇改性水泥砂漿的力學性能及微觀結構

范杰1，李庚英2

２０18年第11期

摘要

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摘要：探討了聚乙烯醇（PVA）及其摻量對水泥砂漿物理力學性能影響。結果表明，隨著PVA摻量變化，水泥砂漿的抗壓、抗折、軸壓強度均呈現明顯的低升高降變化規律。PVA摻量為0.6%時，砂漿具有最優的抗壓、軸壓強度，較之未摻PVA的空白砂漿提升了12.15%和23.19%。1.0%的PVA摻量對水泥砂漿抗折強度提升最為顯著，提升幅度達到24.83%。此外，采用掃描電鏡對不同PVA摻量的水泥砂漿微觀結構觀測表明，適量PVA的摻入，能與水化產物結合形成均勻分布的三維網膜結構，橋接水泥板塊，阻止裂縫開展，提升砂漿的力學性能。而當PVA摻量過高時，將析出大量的片狀聚合物薄膜包裹于水泥表面，抑制水化，并對砂漿宏觀性能造成不利影響。 Abstract: The physical and mechanical properties of cement mortar with polyvinyl alcohol (PVA) added were experimentally studied. The results show that the compressive strength, flexural strength and prismatic compressive strength of cement mortar all increase first and then decrease with the change of PVA content. The compressive strength and prismatic compressive strength of cement mortar increase by 12.15% and 23.19% with the PVA content is 0.6%, and the flexural strength of cement mortar increases by 24.83% with 1.0% mass fraction of PVA incorporation. The microstructure of cement mortar with different PVA content is investigated by using scanning electron microscopy (SEM), and the results show that the rational content of PVA can form evenly dispersed network-like thin films within cement matrix, these network-like films can bridge cracks in cement matrix and improve the mechanical properties of cement mortar. Over-incorporations of PVA may result in the formation of continuous polymer films, and its will cover cement particles and delay the hydration of cement, and adversely affect the performance of cement mortar.

石灰石粉級配對水泥漿性能的影響研究

胡建偉1，劉子科1，2，謝永江1，2，翁智財1，2，王月華1，2

２０18年第11期

摘要

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摘要：為研究石灰石粉級配對水泥漿體性能的影響，選用兩種細度石灰石粉進行復摻處理，測試水泥漿體的標準稠度用水量、凝結時間和流變參數。結果表明：水泥顆粒與石灰石粉顆粒的表面性質不同，其表面吸附水膜厚度也不同，石灰石粉替代水泥改善了膠材體系用水量；膠材體系初凝時間隨石灰石粉替代量的增加，曲線呈下凹的變化趨勢，而終凝時間則與之相反，呈上凸趨勢；隨著特征粒徑De的逐漸增大，體系的屈服應力呈現明顯的下降趨勢。然而，塑性黏度隨特征粒徑De的逐漸增大，呈現小幅上升趨勢。隨著均勻性系數n的增大，體系的屈服應力呈現先增大后減小的趨勢，而塑性黏度呈現先減小后增大的趨勢。 Abstract: The water requirement of standard consistency, setting time and rheological parameters of cement paste mixed with two differernt kinds of fineness of limestone powderswere tested to study the influence of limestone powder gradation on performance of cement paste. The results show that the surface properties of cement particles and limestone powder particles are different, therefore, the surface adsorbed water film thickness of the two particles are different, limestone powders replace cement to improve the water requirement of cementitious material system; the initial setting time of cementitious materials system increases with increasing of limestone powder content, the trend curve is convex-down, but convex trend of the final setting time-limestone powder content is up-convex; with the increasing of the characteristic diameter De, the yield stress of the system decreases. However, with incresing of the plastic viscosity shows a slight upward trend. With increasing of uniformity coefficient n, the yield stress of the system increases first and then decreases,but the plastic viscosity decreases first and then increases.

透水混凝土骨料掛漿厚度影響因素研究

劉遠祥1，張磊蕾2，滿麗瑩1，田寅1，駱靜靜1

２０18年第11期

摘要

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摘要：基于現有的透水混凝土模型，提出了透水混凝土骨料掛漿厚度試驗和計算方法。同時研究了骨料粒徑、水灰比、硅灰摻量和膠粉摻量對骨料表面掛漿厚度的影響。試驗結果表明，骨料粒徑對骨料掛漿厚度影響較??；隨著水灰比的增大，摻入硅灰的凈漿掛漿厚度明顯減小，摻入膠粉的凈漿掛漿厚度基本不變；隨著硅灰摻量的增加，骨料掛漿厚度隨之增大，但增長速率有所減??；隨著膠粉摻量的增加，骨料掛漿厚度先增大后減小。 Abstract:Based on the existing pervious concrete model,the test and calculation method of hanging slurry thickness of aggregate of pervious concrete is proposed. The effect of different aggregate size,W/C, different silica fume and redispersible polymer powder dosages on hanging slurry thickness of aggregate surface is investigated. The results show that the aggregate size has little effect on the hanging slurry thickness. With the increase of W/C, the thickness of cement slurry with silica fume is significantly reduced, the thickness of cement slurry with redispersible polymer powder is not variable. With the increase of silica fume dosage,the thickness of cement slurry is gradually increasing. With the increase of redispersible polymer powder, the thickness of cement slurry first increases and then decreases.

鉛鋅尾礦砂對不同強度等級混凝土影響分析

王輝1，2，吳愛軍1，2，劉文1，2，王為之1，2，張龍1，2，徐梅洪1，2

２０18年第11期

摘要

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摘要：用川西北某鉛鋅尾礦砂部分替代天然砂配制不同強度等級混凝土，分別測試了不同替代率C25~C40混凝土3 d、7 d、14 d、28 d的抗壓強度。結果表明，不同替代率的混合砂混凝土抗壓強度隨時間的增長規律同普通混凝土增長一致；對于四種不同強度等級的混合砂混凝土，28 d抗壓強度值隨替代率的增加先增大后減小且都大于天然砂混凝土，抗壓強度增長率最大是替代率為50%的C20混凝土，增長率達到48.1%。通過試驗驗證，該礦鉛鋅尾礦砂可作為建筑材料使用。 Abstract: The different strength grade concrete with a lead-zinc tailings sand from northwest Sichuan is prepared by the partial substitution of lead-zinc tailings sand, and the compressive strength values of 3 d, 7 d, 14 d and 28 d of C25~C40 different strength gradesconcrete with lead-zinc tailings sand were tested respectively. The results show that the increasing laws of compressive strength of lead-zinc tailings sand concrete with different substitution rate is consistent with that of ordinary concrete. For four different strength grade mixed sand concrete, with the substitution rate increases, the 28 d compressive strength value increases first and then decreases, and all are larger than that of the natural sand concrete, the biggest increase in compressive strength is C20 concrete with a replacement rate of 50%, and the growth rate is 48.1%. The Experimental verification results show that lead-zinc tailings sand can be used as building materials.

機制砂特性及其對預制沉管新拌混凝土性能影響研究

黃文聰1，2，黃海斌3，胡文剛1

２０18年第11期

摘要

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摘要：研究了不同石粉含量機制砂特性以及機制砂混凝土的工作性，并與河砂及河砂混凝土進行了對比。結果表明，機制砂粒形不如河砂，級配優于河砂；機制砂混凝土工作性優于河砂混凝土。石粉含量作為關鍵參數，在一定程度上可以反映機制砂的性能變化，對機制砂自身以及混凝土性能均存在顯著影響。結合沉管新拌混凝土對工作性的要求，系統驗證了優選機制砂混凝土配合比的工作狀態以及不同溫度下的凝結時間、重塑時間、泌水等性能，并對施工過程中沉管混凝土的表觀密度控制作了一定的分析。 Abstract: The properties of manufactured sand and fresh manufactured sand concrete are mainly discussed and compared with natural river sand. Test results show that the particle shape of manufactured sand is inferior to the river sand, however, its grading is superior; the workability of manufactured sand concrete is better. As a key factor，the stone powder content can reflect the properties variation of manufactured sand in some degree and it has a significant influence on both the properties of manufactured sand and concrete. In combination with the workability requirement of precast immersed tube, the working state of the optimized mix proportion and properties including initial-setting time, bleeding rate and re-plasticize time under different ambient temperature are systematically verified. Besides, the control of bulk density during construction is analyzed to some extent.

免蒸壓管樁混凝土配合比設計及節能養護技術研究

田寅，李龍梓，李酉成

２０18年第11期

摘要

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摘要：為實現混凝土管樁的免蒸壓，研究了不同種類摻合料、不同種類減水劑和養護溫度對混凝土12 h脫膜強度和7 d強度的影響。結果表明，管樁混凝土采用80 ℃養護（靜停1 h，升溫2 h，80 ℃恒溫4 h，降溫1 h），并用礦物摻合料取代部分水泥（9%超細礦粉，5%硅灰），摻加早強型減水劑，可使混凝土12 h強度達到60 MPa，7 d強度達到80 MPa，滿足混凝土管樁正常生產要求。 Abstract: In order to realize the concrete of pipes without autoclaving, the effects of different admixtures, different water reducers and curing temperature on the 12 h and 7 d strength of concrete are studied. The results show that the pile concrete can reach 60 MPa after 12 hours and 80 MPa after 7 days when it is cured at 80 ℃ (static for 1 h, heating for 2 h, constant temperature 80 ℃ for 4 h, cooling for 1 h), replaced by part cement with mineral admixture (9% ultrafine mineral powder, 5% silica fume) and mixed with early strength water reducer, and can meet the requirements of unmould.

不同包邊型式混凝土蓋板承載能力試驗分析與研究

鐘維軍，張舜元，李建松

1000-4637（2018）11-42-05

摘要

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摘要：針對電纜蓋板的生產運行現狀，提出了不同包邊型式的預制混凝土蓋板結構形式，并通過承載能力試驗及有限元分析，對比分析了不同包邊型式預制混凝土蓋板的承載力，得到了合理的蓋板設計方法及使用條件?；诓煌厡炷辽w板承載能力的影響，得到應用于不同環境中最優型式的混凝土蓋板。 Abstract: According to the production status of cable cover plate, different types of prefabricated concrete cover plates with different wrapping edges are put forward. Through carrying capacity tests and finite element analysis, the precast concrete cover plates with different wrapping styles are analyzed and studied, and the reasonable design method and use conditions of the cover plates are obtained. Through analysis and comparison, the influence of different wrapping edges on the bearing capacity of concrete cover plates is obtained， and different environments optimal types of concrete cover plates are obtained.

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