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style="font-size:16px;">混凝土及çŽîC»£æ–½å·¥ä¸­çš„重要åœîC½,1935òq´ç¾Žå›½ähE.W .斯克里普ç ?Scripture)首先研制成木质素¼‚ºé…¸ç›äؓ</span><span style="font-size:16px;">主要成分的减水剂åQŒè€Œå‡æ°´å‰‚的得以发展还是在六十òq´ä»£ä»¥åŽã€‚伴随着减水剂的发展åQŒæ؜凝土技术也得到</span><span style="font-size:16px;">了极大的提高。减水剂的发展从普通减水剂ã€?a href="http://www.sa-aa.com/supply/48.html" target="_blank">高效减水å‰?/a>到超塑化剂,混凝土的工作性能也由最初的òq²ç¡¬</span><span style="font-size:16px;">性、塑性进入到目前的高‹¹åŠ¨æ€§æ—¶ä»£ã€‚减水剂的ä‹É用不仅能够媄响æ؜凝土在新拌阶ŒD늚„工作性,而且能够</span><span style="font-size:16px;">从微观、亚微观层次上改善硬化æ؜凝土的结构,从而ä‹ÉäºÞZ»¬å¯ä»¥å€ŸåŠ©äºŽæŽºåŠ å‡æ°´å‰‚的手ŒDµå¯¹æ··å‡åœŸè¿›è¡Œæ”¹</span><span style="font-size:16px;">性,以满­‘›_…¶åœ¨æ–½å·¥æ€§èƒ½ã€åŠ›å­¦æ€§èƒ½å’Œè€ä¹…性能½{‰æ–¹é¢çš„要求ã€?/span> </p> <p> <span style="font-size:16px;">       ç›®å‰åQ?span style="color:#E53333;">减水å‰?/span>己成为æ؜凝土中不可缺ž®‘çš„¾l„分。对混凝土减水剂的研½I¶ç©ºå‰æ´»è·ƒï¼Œè®¸å¤šæ–°åž‹çš„减水剂不断</span><span style="font-size:16px;">被开发出来。早åœ?957òqß_¼Œå·¥ä¸šå‘达国家一半以上的混凝土中ž®±æŽºç”¨äº†å‡æ°´å‰‚。æ؜凝土减水剂在˜q?0òq´å¾—</span><span style="font-size:16px;">到迅速发展, 1985òq´ä¸–ç•Œæ؜凝土减水剂的销售额è¾?6亿美元,ä¸?975òq?倍,1990òq´ä¸Šå‡åˆ°65亿美元。欧</span><span style="font-size:16px;">、美、日½{‰å›½å‡ ä¹Žæ‰€æœ‰çš„水惔混凝土中都ä‹É用了减水剂。高效减水剂又称­‘…塑化剂åQŒç›¸å¯¹äºŽä¸€èˆ¬çš„减水å‰?/span><span style="font-size:16px;">åQŒå®ƒå¯å¤§å¤§é™ä½Žæ°´ç°æ¯”åQŒå¢žåŠ æµåŠ¨åº¦åQŒå…·æœ‰é«˜æ•ˆå‡æ°ß_¼Œæ”¹å–„混凝土孔¾l“构和密实程度,节约水惔åQŒæŽ§åˆ¶æ؜</span><span style="font-size:16px;">凝土的坍落度损失的功能,能改善æ؜凝土的施工性能åQŒè§£å†Ïx؜凝土的引气、缓凝等问题åQŒæé«˜æ؜凝土的强</span><span style="font-size:16px;">度和耐久性,是高性能混凝土中的一¿Uå¿…不可ž®‘的核心材料。â€?1世纪混凝土”的要求不仅仅是高强åQŒæ›´</span><span style="font-size:16px;">多的是这¿Uç»“构材料长期的耐久性,òq¶ä¸”具备密实、稳定和优良的施工性能。减水剂已经成äؓ混凝土除æ°?/span><span style="font-size:16px;">泥、砂、石和水之外的第5¿Uå¿…不可ž®‘çš„¾l„分。从某种意义上说åQŒç›®å‰å„国在混凝土技术上的差距最重要</span><span style="font-size:16px;">的就是减水剂的发展水òqŸë€?/span> </p> <p> <span style="font-size:16px;">      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