水泥渗透结晶型防水材料研究

阐述了渗透结晶型防水材料的作用机理,采用水泥基渗透结晶型防水材料在混凝土表面做涂层,能较好地起到防水作用.系统研究了渗透结晶型防水材料的特点、物理性能、抗渗性能以及施工工艺.     

某高层建筑地下防水工程综合施工技术

某高层建筑基础防水施工中采用了混凝土结构自防水、SBS防水卷材、水泥基渗透结晶型防水涂料、腻子型膨胀橡胶条、止水钢板等多种防水材料,同时对施工过程进行严格的质量控制,取得较好的防水效果。     

新型水泥基防水涂料的试验研究

改性有机硅防水荆(FSJ)作为一种新型防水剂因具有优异的憎水性,近年来在防水工程中日益受到重视.但FSJ只适用于较细裂缝的修补,对于较宽裂缝防水效果不佳.针对这一缺陷,利用FSJ的高渗透性对水泥基防水涂料中的超细活性组分进行处理,经过系统性的试验,研制出一种比已有水泥基渗透结晶型防水涂料防水性能更好的新型水泥基防水涂料.该新型水泥基防水涂料能迅速渗透到砂浆或混凝土内部裂缝等缺陷处,与水泥基材产生反应,生成新的凝胶体及憎水性产物,堵塞毛细孔隙通道,并使裂缝缺陷处不易被水润湿,从而达到防水止漏的作用.由于能在基体中渗入到更深的深度与水泥基材产生化学反应,该新型水泥基防水涂料不仅进一步提高了涂层憎水性,而且改善了整个基体的防水性能,使得防水性能更持久可靠,同时还提高了混凝土的强度和耐久性,解决了单独使用有机硅防水剂对于屋面和墙面较宽裂缝修补效果不佳的问题.     

水泥砂浆外涂有机硅烷防护效果研究

为了研究外涂有机硅水泥砂浆材料的防护效果,用有机硅涂料对水泥砂浆进行表面涂层处理,并与未涂层水泥砂浆和涂丙烯酸的水泥砂浆相比较,系统研究了改性有机硅涂层对防水抗渗性能、抗碳化性能、抗氯离子渗透等性能的影响。试验结果表明：有机硅外涂水泥砂浆呈现出较好地疏水效果,使用有机硅外涂水泥砂浆的防水抗渗性能大大改善了;与空白组、丙烯酸组相比,涂有有机硅涂层的砂浆的氯离子扩散系数显著降低,约为空白组的1／4,约为丙烯酸组的1／3;随着养护时间的增加,涂有有机硅涂层的试块的碳化程度明显低于空白组和丙烯酸组,而且碳化深度增长速度明显变慢;空白样水泥砂浆密实性较差,表面粗糙多孔,试块结构疏松,而加了硅烷的试块涂料与水泥浆表面粘结紧密,界面区并不明显。为烷氧基有机硅烷作为水泥砂浆防护材料实际工程应用奠定一定的基础。     

水泥基渗透结晶型防水材料的正交优化及抗渗性能研究

为获得水泥基渗透结晶型防水材料的最优配方,采用正交试验法研究了酒石酸(A)、碳酸钠(B)、硅酸 钠(C)、羧甲基纤维素钠(D)、氟硅酸镁(E)的不同掺量对基准试块抗渗性能的影响。结果表明,单因素试验中 对试块抗渗性能影响最大的是碳酸钠,其次是酒石酸和氟硅酸镁。正交试验确定A：B：C：D：E 的最佳配比 为6：2：1：2：3,且优化后的一次抗渗和二次抗渗性能均为0.5 MPa,明显优于某市售产品的抗渗性能。采 用逐步回归分析法对实验数据进行优化分析,未通过变量的显著性检验,可能是水泥基渗透结晶型防水材料 配方涉及复杂的化学反应。     

渗透结晶型防水胶泥抗渗性试验研究

文章采用原料易得地方材料,通过正交设计、对比试验,研制物理力学及防水性能好、施工方便、价格较低的无机类渗透结晶型防水胶泥材料,该材料可在建筑工程背水面进行防水处理,提高了防水施工效率.     

水泥基渗透结晶型防水材料的制备及性能研究

采用四因素三水平的正交试验方法对渗透结晶材料各组分进行优化,研制一种新型水泥基渗透结晶 型防水材料。研究不同龄期基体涂刷水泥基渗透结晶型防水材料的防水效果,并对其进行机理分析。试验结 果表明：结晶体可渗透距涂层表面20mm 深;基体3d 龄期时涂刷水泥基渗透结晶型防水材料防水效果最佳; 涂刷自制防水材料的砂浆试件(带涂层)的抗渗压力比可达400%,不带涂层达到333%;涂刷防水材料的砂浆试 件,其中水泥水化产物可与防水母料中的活性化学物质发生反应,生成结晶体和不溶物,堵塞毛孔,提高砂 浆试件的防水性能。     

一种新型防水涂料用抗裂剂问世

一种新型防水涂料用抗裂剂在天津问世．这种称为“外墙保温抗裂防水涂料用抗裂剂及其制备方法”的发明专利．可广泛用于砖石、灰墙、水泥砂浆、混凝土、保温板等基材上。能起到保温、抗裂、防水等作用。     

碱—硅酸反应混凝土维修材料初探

因混凝土中的碱－硅酸反应（ＡＳＲ）引起的破坏事例多有报导,用于维修的各种表面处理材料亦很多,本文研究了硅烷、聚合物水泥砂浆及防水涂料等三种维修材料,结果表明,它们对降低由ＡＳＲ引起的混凝土膨胀效果良好,尤其是本文所用憎水性防水涂料能有效阻止ＡＳＲ的进行。     

水泥基渗透结晶型防水材料的研究进展

对水泥基渗透结晶型防水材料的产生、发展、特性、防水机理及应用范围做了综合性论述.     

Self-healing Action of Permeable Crystalline Coating on Pores and Cracks in Cement-based Materials

The self-healing action of a permeable crystalline coating on the porous mortar was investigated by two times impermeability test. Moreover, the self-healing mechanism of cement-based materials with the permeable crystalline coating, was studied by SEM. The results indicate that the permeable crystalline coating not only seals the pores and cracks in mortar during its curing process, but also heals the permeable pathway caused by first impermeability test or cracks produced by freeze-thaw cycles . Therefore, cement-based materials can be improved by the permeable crystalline coating for the self-healing function. SEM images prove that the self-healing function is realized by generating a great quantity of non- soluble dendritic crystalline within the pores and cracks, which prevents the penetration of water and other liquids.     

催化结晶型抗渗涂料对水泥基材料性能的影响

研究了催化结晶型抗渗涂料对水泥基材料的力学性能、抗渗性、自修复性和孔隙率的影响。探讨了性能的改善与孔隙率变化的关系。结果表明：经过催化结晶型抗渗涂料处理，试件的力学性能可提高15％以上；一次和二次抗渗性能则分别从0．4MPa、0．1MPa提高到1．5MPa和1．3MPa，显著地增强了水泥混凝土的力学性能和抗渗性，并赋予混凝土养护自愈舍的功能。压汞试验证实，经过催化结晶涂料处理，砂浆试件孔尺寸大大减小，孔隙率从36．4％降低至14．8％。     

THE IMPERMEABILITY OF CEMENT MORTAR BY DRYTHERMAL CURING

The relationship of unstable osmosis coefficient to time and osmosis deep is derived from the osmosis equation in this paper. Mercury porosimeter is used to study the pore structure of cement mortar. The method of volume density is used to determine the changes of specific pore volume, and therelation between pore structure and impermeability is analyzed. Although the drythermal curing method has many advantages over other curing method, the directional pore along the direction of evaporization of water is formed inside concrete. The harmful pore above 2000(?) is increased and the average diameter of pore rises. As a result, the mortar impermeability loses seriously.     

经干热养护水泥砂浆的抗渗性

本文从渗透方程导出砂浆非稳态渗透系数与时间和渗透深度的关系,采用水银压入法研究水泥浆体的孔结构,采用容重法测试砂浆比孔容的变化,分析孔结构与抗渗性的关系。干热养护虽然具有很多优点,但混凝土内部沿水分蒸发方向形成定向串通毛细孔道,大于2000A的多害孔增加,最大可几孔径增大,因而严重地降低砂浆的抗渗性。     

Preparation of High Impermeable and Crack-resistance Chemical Admixture and Its Mechanism

A kind of high impermeable and crack-resistance chemical admixture ( HICRCA ) was prepared, which is a compound chemical admixture composed of an expansion ingredient, density ingredient, and organic hydrophobic poreblocking ingredient. The results of the experiments indicate that the addition of HICRCA improves mortar and concrete in the following performances: ( 1 ) perfect workability: slump is more than 22cm, the slump after 3 h is about 16cm; (2) high impermeability.for the mortar, the pervious height under a water pressure of 1.5MPa is 1.5cm,for the concrete, the pervious height under a water pressure of 5.0MPa is 2.2cm; (3) high crack-resistance:there is a micro-expansion at the age of 9Od ; ( 4 ) high compressivestrength : compared with the controlled concrete, the compressive strengths at the age of 3d and 28d are improved by 66.4% and 62.0%, respectively. At the same time, the effects of different curing condigon on mortar and concrete expansive and shrinkage performance were studied. In addition, the impermeable and crack-resistance mechanism was investigated in the present paper.     

薄壁结构C50抗渗防裂混凝土试验

根据薄壁结构混凝土的特点，利用中热硅酸盐水泥优化设计出了C50抗渗防裂混凝土配合比。试验结果表明：聚丙烯纤维、钢纤维通过单掺或混掺配制的混凝土28d抗压强度均达到56MPa，抗渗等级P12，满足混凝土的抗渗防裂要求；且单掺聚丙烯的纤维混凝土表现出更优异的抗渗透能力和抗裂性能。SEM微观结构显示，掺膨胀剂混凝土中的水泥石结构均匀密实，产生的钙矾石水化产物丰富，对水泥石收缩具有明显补偿作用，提高了薄壁结构混凝土的抗渗防裂能力。     

Effect of curing regime on bonding strength of EVA modified mortar to tile

Ethylene-Vinyl Acetate (EVA) redispersible powder and latex were used to modify mortar. Three kinds of curing regimes: standard curing, high temperature curing and freeze-thaw circle curing were adopted to cure the bonded samples. Bonding strength of EVA modified mortar was tested at 28 days. The development of bonding strengths under all three curing regimes were discussed and compared. The experimental results show that bonding strength increases with the increase of EVA content in mortar. The curing regime used within 28 days is critical according to the bonding strengths values under three curing regimes for different ages. The reasons of that the EVA can improve the bonding strength were analyzed.     

低活性矿渣内养护水泥砂浆自收缩与电阻率的关系

以预吸水低活性矿渣替代细集料作为内养护材料,研究低活性矿渣内养护砂浆自收缩与电阻率的变化规律,揭示两者的关系。结果表明：随着低活性矿渣掺量的增加,砂浆早期强度降低幅度大,随着龄期的延长,砂浆中后期强度降低幅度小于早期,建议低活性矿渣的合适掺量取为细集料质量的15%~25%;低活性矿渣内养护对砂浆电阻率发展影响明显,凝结硬化前,浆体电阻率随低活性矿渣掺量的增大而增大;凝结硬化后,浆体电阻率随低活性矿渣掺量的增大而减小;低活性矿渣内养护能有效抑制浆体各阶段的自收缩,尤其在快速收缩阶段和短暂膨胀阶段作用最为明显,同时,36 h龄期后电阻率与自收缩有很好的对应关系,可通过电阻率发展趋势预测自收缩的变化情况。     

Effect of Curing Regime on Bonding Strength of EVA Modified Mortar to Tile

Ethylene-Vinyl Acetate (EVA) redispersible powder and latex were used to modify mortar. Three kinds of curing regimes: standard curing, high temperature curing and freeze-thaw circle curing were adopted to cure the bonded samples. Bonding strength of EVA modified mortar was tested at 28 days. The development of bonding strengths under all three curing regimes were discussed and compared. The experimental results show that bonding strength increases with the increase of EVA content in mortar. The curing regi...