近年來，GRC構(gòu)件開始大量出現(xiàn)在應(yīng)用中。下面從導(dǎo)致GRC構(gòu)件開裂的諸多因素來介紹對GRC構(gòu)件的分析，并簡要介紹其應(yīng)對策略和方案。我希望它可以對大家有所幫助。
In recent years, GRC components began to appear in a large number of applications. The following introduces the analysis of GRC members from the many factors that lead to the cracking of GRC members, and briefly introduces their coping strategies and solutions. I hope it can help you.
GRC構(gòu)件的開裂程度因地區(qū)而異。在南方，特別是沿海地區(qū)，氣候潮濕。一年中大部分時間空氣的相對濕度約為90%。在這種高溫潮濕的氣候下，GRC構(gòu)件的含水率總是很高。如不采取特殊干燥措施，自然狀態(tài)下的組分水分含量不能低于標(biāo)準(zhǔn)規(guī)定的10%。
The degree of cracking of GRC members varies from region to region. In the south, especially in the coastal areas, the climate is humid. The relative humidity of the air is about 90% for most of the year. In this high temperature and humid climate, the moisture content of GRC components is always very high. If no special drying measures are taken, the moisture content of components in natural state shall not be less than 10% of the standard.
因此，南方，尤其是沿海地區(qū)，更容易開裂。開裂通常發(fā)生在構(gòu)件到構(gòu)件和構(gòu)件到梁的接頭處。裂紋的寬度與構(gòu)件的干縮值、冷縮值和構(gòu)件的橫向長度有關(guān)。大多數(shù)裂縫寬度在0.5mm以內(nèi)。
Therefore, the south, especially the coastal areas, is more prone to cracking. Cracking usually occurs at member to member and member to beam joints. The crack width is related to the dry shrinkage value, cold shrinkage value and the transverse length of the member. The width of most cracks is within 0.5mm.
改善構(gòu)件的材料性能，主要要達到兩個目的：一是降低構(gòu)件的收縮值，包括干收縮值和冷收縮值，以減少構(gòu)件的收縮變形；拉伸值。通過這種“一增一減”，盡可能達到構(gòu)件收縮變形和拉伸變形的平衡。然而，目前GRC構(gòu)件的特性使其難以平衡拉伸和收縮值。
To improve the material properties of components, two objectives should be achieved: one is to reduce the shrinkage value of components, including dry shrinkage value and cold shrinkage value, so as to reduce the shrinkage deformation of components; Stretch value. Through this "one increase and one decrease", the balance between shrinkage deformation and tensile deformation of members can be achieved as far as possible. However, the current characteristics of GRC members make it difficult to balance the tensile and shrinkage values.
做一篇關(guān)于GRC構(gòu)件安裝結(jié)構(gòu)的文章，目前的主要攻擊方向一般放在構(gòu)件和接縫材料的接縫處理上。在構(gòu)件本身質(zhì)量合格的前提下，構(gòu)件的接合處始終是薄弱環(huán)節(jié)，此處容易出現(xiàn)裂紋。簡單的“粘貼”，即使是用玻璃纖維布加固部件的接縫，也很難防止出現(xiàn)裂縫。
In an article on GRC component installation structure, the current main attack direction is generally on the joint treatment of components and joint materials. On the premise that the quality of the component itself is qualified, the joint of the component is always a weak link, where cracks are prone to occur. Simple "sticking", even if the joints of components are reinforced with glass fiber cloth, it is difficult to prevent cracks.
構(gòu)件肯定會縮水，用力拉也很難拉。結(jié)果，由于沒有收縮變形和拉伸變形之間的平衡，因此經(jīng)常出現(xiàn)構(gòu)件開裂或構(gòu)件接頭開裂的情況。更重要的是，在安裝構(gòu)件時，需要上下和來回交錯以對齊。很難使砂漿充滿。大部分安裝后填入砂漿，不易保證附著力。
The components will surely shrink and it is difficult to pull with force. As a result, because the balance between shrinkage deformation and tensile deformation is not solved, member cracking or member joint cracking often occurs. More importantly, when installing components, they need to be staggered up and down and back and forth to align. It is difficult to fill the mortar. Most of them are filled with mortar after installation, so it is difficult to ensure the adhesion.
GRC構(gòu)件采用彈性砂漿增加拉伸變形值。就防止構(gòu)件接頭開裂而言，思路和方法是正確的。但在實踐中卻存在一個難以的矛盾，即彈性砂漿的高彈性與構(gòu)件飾面材料的低彈性之間的矛盾。構(gòu)件飾面材料（如膩子）的伸長率遠小于彈性砂漿，構(gòu)件表面仍會開裂。為此目的，要求飾面材料達到相同的高提拉率在成本方面是不現(xiàn)實的。
GRC members use elastic mortar to increase the tensile deformation value. In terms of preventing cracking of component joints, the idea and method are correct. But in practice, there is a contradiction that is difficult to solve, that is, the contradiction between the high elasticity of elastic mortar and the low elasticity of component facing materials. The elongation of component finishing materials (such as putty) is far less than that of elastic mortar, and the component surface will still crack. For this purpose, it is unrealistic in terms of cost to require the finishing materials to achieve the same high lifting rate.
綜合以上分析，
濟南GRC構(gòu)件目前很難不開裂。即使GRC構(gòu)件不開裂，單組份飾面材料（如膩子）的變形率也不如GRC高，墻體表面仍有裂紋，這在普羅旺斯的外墻中更為明顯。有些裂縫實際上只是飾面材料中的裂縫。由于墻面的淺色油漆，馬上就會出現(xiàn)一點點開裂。
Based on the above analysis, it is difficult for Jinan GRC members not to crack at present. Even if GRC members do not crack, the deformation rate of single component finishing materials (such as putty) is not as high as GRC, and there are still cracks on the wall surface, which is more obvious in the exterior wall of Provence. Some cracks are actually just cracks in the finishing material. Due to the light color paint on the wall, there will be a little cracking immediately.
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