第四期_2021_《混凝土與水泥制品》雜志社

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第四期

矸石電廠粉煤灰的活化及應用技術 ——評《矸石電廠粉煤灰的活化及應用》

馮月娥

2021年第4期

摘要

引用本文

我國混凝土工程建設飛速發展，水泥用量與日俱增。而生產水泥需要消耗大量能源，這與國家的綠色環保政策背道而馳。矸石電廠用的煤矸石燃燒后灰分較高，粉煤灰的產出量是燃煤電廠的2倍左右，產出的粉煤灰含碳量高，理化特性與燃煤電廠粉煤灰差別較大，且造成了嚴重的環境污染和土地資源浪費。矸石電廠粉煤灰的循環利用已逐漸引起了學術界的關注，成為了研究熱點。陳杰編著的《矸石電廠粉煤灰的活化及應用》一書通過對矸石電廠粉煤灰的形貌特征、化學成分、礦物組成等進行分析，采用化學、物理和物理化學活化技術對粉煤灰-水泥膠砂體系進行激活，得出了合理的活化方案；此外，以矸石電廠粉煤灰取代水泥制造粉煤灰基膏體充填材料，實現廢物循環利用。筆者通過學習，認為該書具有較強的實用性，對于實現循環經濟具有一定的指導意義，現簡要總結重點內容。

馮月娥.矸石電廠粉煤灰的活化及應用技術——評《矸石電廠粉煤灰的活化及應用》[J].混凝土與水泥制品,2021(4):103.

摻鋰渣再生混凝土細觀結構與抗壓強度關系研究

陳潔靜，秦擁軍，盧義

2021年第4期

摘要

引用本文

摘 ? 要：基于計算機圖像處理技術，從摻鋰渣再生混凝土的CT圖像中提取出孔隙結構，利用IPP和FractalFox軟件對不同再生粗骨料取代率和不同鋰渣摻量立方體試件的孔隙率、分形維數、形狀因子進行了計算與統計，并對孔隙特征與立方體抗壓強度進行了關聯性研究。結果表明：摻鋰渣再生混凝土的孔隙率與立方體抗壓強度滿足三次方程關系；一定范圍內，孔隙形狀因子與抗壓強度之間的關聯性良好。 Abstract: Based on the computer image processing technology, the pore structure from CT images of recycled concrete with lithium slag was extracted. The porosity, fractal dimension and shape factor of cube specimens with different recycled coarse aggregate replacement rate and different lithium slag content were calculated and counted by IPP and FractalFox software, and the relationship between the three factors and cube compressive strength was studied. The results show that the porosity and compressive strength of recycled concrete with lithium slag satisfy the cubic equation relationship. There is a good correlation between the pore shape factor and compressive strength within a certain range.

陳潔靜,秦擁軍,盧義.摻鋰渣再生混凝土細觀結構與抗壓強度關系研究[J].混凝土與水泥制品,2021(4):88-93. CHEN J J,QIN Y J,LU Y.Study on the Relationship Between Microstructure and Compressive Strength of Recycled Concrete with Lithium Slag[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):88-93.

摻粉煤灰再生混凝土聲發射檢測試驗研究

張仕樺1,2，劉京紅1，劉婷3，周雙雙4，劉子倩5

2021年第4期

摘要

引用本文

摘 ? 要：為了研究再生混凝土內部損傷隨應力變化的演變規律，基于聲發射技術對齡期為14 d、28 d、60 d的不同再生粗骨料替代率和不同粉煤灰摻量的混凝土進行了動態檢測，獲得了表征摻粉煤灰再生混凝土損傷演化過程的典型能量-應力圖、撞擊累計數-應力曲線以及聲發射損傷定位圖，探究了再生粗骨料替代率、粉煤灰摻量和齡期對聲發射參數的影響，揭示了各應力階段與內部損傷情況的關系。結果表明：再生粗骨料替代率越高，壓密階段占整個應力上升階段的時間越長，由1/5上升到1/2，且各階段的劃分不突出，應力破壞階段相應提前；摻加適量的粉煤灰可以密實再生混凝土內部的初始缺陷，但是，當粉煤灰摻量為30%時，試塊在塑性階段的撞擊累計數開始出現劇增現象，使得捕捉材料破壞的預兆信息提前；不同齡期對再生混凝土的內部初始缺陷有一定影響，尤其體現在壓密階段和破壞階段的撞擊累計數上。 Abstract: In order to study the evolvement rule of the internal damage of recycled concrete with the change of stress caused by the initial defect, based on acoustic emission technology, dynamic monitoring was conducted for concrete with different recycled coarse aggregate replacement rate and different fly ash content with ages of 14 d, 28 d and 60 d. The typical energy-strain impact cumulative stress curve and acoustic emission damage location diagram representing the damage evolution process of recycled concrete with fly ash were obtained. The influence of recycled coarse aggregate replacement rate, fly ash content and age on acoustic emission parameters was explored, and the relationship between each stress stage and internal damage was revealed. The results show that the higher the recycled coarse aggregate replacement rate, the longer the compaction stage takes up in the whole stress rising stage, from 1/5 to 1/2, and the division of each stage is not convex, and the stress failure stage is corresponding to the premise. Adding appropriate amount of fly ash can compact the internal defects of recycled concrete. However, when the fly ash content is 30%, the cumulative number of impacts of test block in the plastic phase begins to increase dramatically, which leads to the advance of capturing the foreshadowing information of material failure. Different ages have a certain influence on the internal initial defects of recycled concrete, especially in the cumulative impact of compaction stage and failure stage.

張仕樺,劉京紅,劉婷,等.摻粉煤灰再生混凝土聲發射檢測試驗研究[J].混凝土與水泥制品,2021(4):94-98. ZHANG S H,LIU J H,LIU T,et al.Acoustic Emission Detection Experimental Study on Recycled Concrete with Fly Ash[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):94-98.

GRC再生混凝土裝飾掛板的研制

肖建莊1，侯逸青1，張寶貴2，李云利2

2021年第4期

摘要

引用本文

摘 ? 要：利用再生骨料制備再生混凝土作為玻璃纖維增強水泥（GRC）掛板的裝飾層，分別從掛板的組成、物理性能和力學性能方面進行了試驗和分析。結果表明：與傳統掛板相比，GRC再生混凝土裝飾掛板更加輕薄，具有優良的物理性能和力學性能。 Abstract: The decorative layer of the glass fiber reinforced cement (GRC) panel was made of recycled aggregate concrete, and the composition, physical and mechanical properties of the panel were tested and analyzed. The results show that compared with the traditional panel, GRC recycled concrete decorative panel is lighter and thinner, and has excellent physical and mechanical properties.

肖建莊,侯逸青,張寶貴,等.GRC再生混凝土裝飾掛板的研制[J].混凝土與水泥制品,2021(4):99-102. XIAO J Z,HOU Y Q,ZHANG B G,et al.Development of GRC Recycled Concrete Decorative Panels[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):99-102.

不同裂縫尺度下無機輕骨料砂漿外墻外保溫系統溫度場分析

田靜靜1，袁克龍1，熊厚仁2，鄭豪2

2021年第4期

摘要

引用本文

摘 ? 要：研究了不同裂縫尺度下無機輕骨料砂漿外墻外保溫系統的溫度場變化情況，對含預制裂縫寬度為0.05 mm、0.10 mm、0.20 mm、0.30 mm、0.40 mm和0.50 mm的試件進行了160次熱雨循環試驗，測量了不同裂縫尺度下試件的溫度值，分析了各階段的溫度場變化規律。結果表明：與無裂縫情況下相比，試件預制裂縫對基墻溫度的變化有一定影響；系統的熱物理性能隨熱雨循環次數的增加而逐漸劣化，裂縫寬度對保溫層溫度的變化影響很小，僅會對基墻的溫度造成一定影響；當裂縫較寬時，基墻將在升溫階段達到較高的溫度。 Abstract: The temperature change in the external thermal insulation composite systems of inorganic lightweight aggregate mortar (ETICS-ILAM) containing different crack scales was studied. 160 times of hot rain cycles were carried out on ETICS-ILAM specimens with prefabricated crack widths of 0.05 mm, 0.10 mm, 0.20 mm, 0.30 mm, 0.40 mm and 0.50 mm. The temperature values of the specimens with different crack sizes were measured, and the variation law of the temperature field in each stage was analyzed. The results show that the prefabricated cracks in the specimens have a certain influence on the temperature change in the base-wall. The thermal physical properties of the system gradually deteriorate with the increase of the number of heat-rain cycles. The crack width has little influence on the temperature change in the insulation layer, but has noticeable influence on the temperature in the base-wall. When the crack has a relatively bigger width, the temperature in the base-wall can reach a relatively higher value during the temperature increasing stage.?

田靜靜,袁克龍,熊厚仁,等.不同裂縫尺度下無機輕骨料砂漿外墻外保溫系統溫度場分析[J].混凝土與水泥制品,2021(4):69-73. TIAN J J,YUAN K L,XIONG H R,et al.Analysis on Temperature Field of External Thermal Insulation Composite Systems of Inorganic Lightweight Aggregate Mortar with Different Crack Scales[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):69-73.

自密實陶粒泡沫混凝土墻板生產試驗研究

張珍杰1，王東明1，王可2，鄒定華1

2021年第4期

摘要

引用本文

摘 ? 要：為了獲得合適的陶粒泡沫混凝土墻板生產工藝參數，進行了自密實陶粒泡沫混凝土墻板工廠生產試驗。結果表明：混凝土的坍落擴展度是生產中的關鍵參數，當其達到SF1級自密實混凝土性能要求時，所生產墻板的完整性好，但是表面缺陷較多；而達到SF2級自密實混凝土性能要求時，所生產墻板的質量好，表面缺陷少；混凝土的工作性越好，累計破泡率越小。 Abstract: In order to obtain appropriate production technology parameters of ceramist foam concrete wall panels, the factory production tests of self-compacting ceramsite foam concrete wall panels in production were carried out. The results show that the slump flow of concrete is the key parameter in production, and when it meets the requirement of class SF1 self-compacting concrete, the integrity of wall panels is good, but there are many surface defects. When it meets the requirement of class SF2 self-compacting concrete, the quality of wall panels is good and the surface defects are less. The better the workability of concrete, the smaller the cumulative bubble breaking rate.

張珍杰,王東明,王可,等.自密實陶粒泡沫混凝土墻板生產試驗研究[J].混凝土與水泥制品,2021(4):74-77. ZHANG Z J,WANG D M,WANG K,et al.Research on Production Test of Self-compacting Ceramist Foam Concrete Wall Panels[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):74-77.

CFRP板加固高強混凝土梁試驗研究

韓艷，王龍龍

2021年第4期

摘要

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摘 ? 要：通過三點彎曲試驗，并利用CCD相機及數字散斑分析技術研究了CFRP板裂縫擴展至破壞的全過程。結果表明：各因素對試件承載力的影響程度從大到小依次為CFRP板厚、加載速率、裂縫深度、混凝土強度；粘貼CFRP板的高強混凝土試件破壞是由混凝土剪切破壞引起的CFRP板粘貼膠層與混凝土之間的界面剝離破壞，其從裂縫開始擴展到完全破壞的時間明顯長于未粘貼CFRP板的試件；黏結界面仍是外粘CFRP板加固高強混凝土構件的薄弱部位。 Abstract: The whole process of the specimens from crack propagation to destruction was studied through the three-point bending test, and the CCD camera observation system and digital speckle analysis technology were used. The test results show that the order of influence factors on the bearing capacity of the high-strength concrete specimens is CFRP plate thickness, loading rate, depth of the pre-crack and the concrete strength. The failure of high-strength concrete specimens reinforced with external CFRP plates is the interface peeling damage between the CFRP plates adhesive layer and the concrete caused by the shear failure of the concrete, and the time from crack propagation to complete failure is significantly longer than that of the specimens without CFRP reinforcement. The bonding interface is still the weak part of the high-strength concrete members reinforced by externally bonding CFRP plates.

韓艷,王龍龍.CFRP板加固高強混凝土梁試驗研究[J].混凝土與水泥制品,2021(4):78-82. HAN Y,WANG L L.Experimental Study on Strengthening High-strength Concrete Beam with CFRP Plates[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):78-82.

國外蒸壓加氣混凝土板式承重墻研究現狀

李欣憶1，王昊2，任寶雙2，初明進1，陳國堯1，李祥賓1

2021年第4期

摘要

引用本文

摘 ? 要：與蒸壓加氣混凝土砌塊墻相比，蒸壓加氣混凝土配筋墻板對低層建筑可不設置構造柱，混凝土現場澆筑量小、構件尺寸大的特點使其組裝更高效。本文介紹了蒸壓加氣混凝土板式承重墻結構在國外的應用情況，結合已有研究成果和相關技術規范對該結構的力學性能進行了說明，并展望了該結構體系的應用前景。研究表明：蒸壓加氣混凝土板式承重墻的抗震性能良好，結構在設防烈度下可以保持預屈服狀態，在大震作用下具有充分的強度儲備。 Abstract: Compared with autoclaved aerated concrete block wall, autoclaved aerated concrete panel wall of low-rise buildings has no need to composite with constructional column. Small quantity of concrete pouring and large component size make its assembly more efficient. The application of autoclaved aerated concrete load bearing panel wall structure abroad is introduced, and the mechanical properties of the structure according to the research results and relevant design codes are reviewed. Researches indicate that autoclaved aerated concrete load bearing panel wall has good seismic performance. The wall behaves in its pre-yield region under the seismic fortification intensity, and has sufficient strength reservation in strong earthquake. In conclusion, the application of autoclaved aerated concrete load bearing panel wall structure is prospected.

李欣憶,王昊,任寶雙,等.國外蒸壓加氣混凝土板式承重墻研究現狀[J].混凝土與水泥制品,2021(4):83-87. LI X Y,WANG H,REN B S,et al.Research Status in Autoclaved Aerated Concrete Load Bearing Panel Walls Abroad[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):83-87.

高溫后PVA纖維增強水泥基復合材料力學性能試驗研究

楊珊1，李祚1，彭林欣1,2，羅月靜3,4，滕曉丹1,2,5

2021年第4期

摘要

引用本文

摘 ? 要：對經過100 ℃、200 ℃、400 ℃、600 ℃高溫處理后的聚乙烯醇纖維增強水泥基復合材料（PVA-ECC）進行了單軸壓縮試驗、單軸拉伸試驗、剪切試驗和四點彎曲試驗，對不同溫度下的試驗結果進行了對比分析，擬合了高溫后PVA-ECC各項性能的退化曲線，并通過掃描電鏡觀察了微觀結構。結果表明：PVA-ECC在常溫下能夠表現出良好的變形能力；當溫度由常溫升至100 ℃時，抗壓強度大幅下降，繼續升至200 ℃時則有一定提高；當溫度超過200 ℃以后，抗壓強度、抗拉強度和極限拉應變均降低，試件由延性破壞變為脆性破壞；常溫下，PVA-ECC試件表面密實完整，經過400 ℃高溫處理后，試件呈現出稀疏多孔結構，溫度超過600 ℃時，試件表面呈片狀、海綿狀形態。 Abstract： Uniaxial compression, uniaxial tensile, shearing and four-point bending tests were carried out on polyvinyl alcohol fiber reinforced cement-based composite materials (PVA-ECC) after high temperature treatment at 100 ℃, 200 ℃, 400 ℃ and 600 ℃. The test results at different temperatures were compared and analyzed, the degradation curves of various properties of PVA-ECC after high temperature were deduced, and the microstructure was observed by scanning electron microscope. The results show that PVA-ECC has good deformation capacity at room temperature. When the temperature rises from room temperature to 100 ℃, the compressive strength decreases greatly, and then increases to a certain extent when it continues to rise to 200 ℃. When the temperature exceeds 200 ℃, the compressive strength, tensile strength and ultimate tensile strain of PVA-ECC are reduced, and the specimen changes from ductile failure to brittle failure. At room temperature, the surface of PVA-ECC is dense and complete. After being treated at 400 ℃, the specimen exhibits a sparse porous structure. When the temperature exceeds 600 °C, the surface of the specimen becomes flake and sponge.

楊珊,李祚,彭林欣,等.高溫后PVA纖維增強水泥基復合材料力學性能試驗研究[J].混凝土與水泥制品,2021(4):49-54. YANG S,LI Z,PENG L X,et al.Study on Mechanical Properties of PVA-ECC Composites After Elevated Temperature[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):49-54.

混雜纖維輕骨料混凝土力學與導熱性能研究

黃曉雯，龐建勇，王鳳瑤，沈恒祥，劉宜思

2021年第4期

摘要

引用本文

摘 ? 要：采用正交試驗對鋼-植物混雜纖維輕骨料混凝土（Steel-plant Fibre Hybrid Lightweight Aggregate Concrete，SPFLC）的抗壓強度、抗拉強度、抗剪強度和導熱性能進行了研究，并使用Matlab軟件進行了多元線性回歸分析，得到了SPFLC力學性能與導熱性能的預測模型。結果表明：陶粒摻量對SPFLC的抗壓強度、抗拉強度、抗剪強度和導熱性能均有高度顯著影響，對抗拉強度的貢獻率最大為67.48%；陶砂摻量對SPFLC的抗拉強度幾乎無影響，對抗壓強度的貢獻率最大為49.72%；鋼纖維摻量對SPFLC的抗壓強度和抗剪強度有高度顯著影響，對抗剪強度的貢獻率最大為42.36%；植物纖維摻量對SPFLC的力學性能和導熱性能均有高度顯著影響，對抗拉強度的貢獻率最大為26.61%，且隨著植物纖維摻量的增加，導熱系數最大下降了23.7%；建立的SPFLC力學性能與導熱性能預測模型的精度較高。 Abstract: The compressive strength, tensile strength, shear strength and thermal conductivity of steel-plant hybrid fiber lightweight aggregate concrete(SPFLC) were studied by orthogonal tests. The prediction model of mechanical properties and thermal conductivity of SPFLC were obtained by multiple linear regression analysis with Matlab software. The results show that the ceramsite content has a highly significant influence on the compressive strength, tensile strength, shear strength and thermal conductivity of SPFLC, and the maximum contribution rate to tensile strength is 67.48%. The content of ceramic sand has almost no influence on the tensile strength of SPFLC, and the maximum contribution rate to compressive strength is 49.72%. The steel fiber content has a highly significant influence on the compressive strength and shear strength of SPFLC, and the maximum contribution rate to shear strength is 42.36%. The plant fiber content has a highly significant influence on the mechanical and thermal properties of SPFLC, among which the contribution rate to tensile strength is up to 26.61%, and the thermal conductivity decreases by 23.7% with the increase of plant fiber content. The prediction models of mechanical properties and thermal conductivity of SPFLC have a high accuracy.

黃曉雯,龐建勇,王鳳瑤,等.混雜纖維輕骨料混凝土力學與導熱性能研究[J].混凝土與水泥制品,2021(4):55-59. HUANG X W,PANG J Y,WANG F Y,et al.Study on Mechanical and Thermal Conductivity of Hybrid Fiber Lightweight Aggregate Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(4):55-59.

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