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水泥重要还是砂子重要?答案你可能想不到
发布日期:2020/10/30    浏览量:39    所属分类:开心电玩城

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SHUINISHIYIGEWEIDADEFAMING,SHIRENLEIJIANZHUSHISHANG *CHENGGONGDEJIANZHUCAILIAO,QIZHONGYAOXINGWUYONGZHIYI,BUGUOXIXIAODESHAZIYEBURONGHUSHI。

2018NIAN10YUE,GANGZHUAODAQIAOZHENGSHIJIANCHENGTONGCHE。ZUOWEIYIXIANGZONGTOUZI1000YI,LIANJIEXIANGGANG、ZHUHAIHEAOMENDEDECHAOJIGONGCHENG,GANGZHUAODAQIAOZAICUJINXIANGGANG、AOMENHEZHUJIANGSANJIAOZHOUXIANDIQUJINGJISHANGDEJINYIBUFAZHANJUZHONGYAODEZHANLVEYIYI,SHIZHONGGUONAIZHI JIAOTONGYE TIAOZHANXINGDECHAOJIGONGCHENGXIANGMUZHIYI。

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同时,港珠澳大桥作为一个 装备制造业、材料业的典型集成代表,集成了前端设计、材料、工程、装备等一系列产业链,代表了中国制造的集成实力。不过很少人知道的是,港珠澳大桥建设过程中,砂子曾经是困扰施工企业的一大难题。

机制砂1000元/吨 港珠澳大桥建设背后的故事

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浇注式沥青混凝土的流动性对砂子的要求极高,保证砂的表面既要有多棱体确保强度,又要有很好的圆润度和颗粒级配保证流动性,但是当时国内的机制砂很多都存在过多的菱角或存在针片状很难滚动,难以符合施工要求。

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据南方路机市场总监周炜的介绍,当时为了解决砂子的问题,建设方曾找到国外机制砂生产企业,该企业生产的产品能够满足建设需要,但是给出的价格却高达1000元/吨,这个价格是普通机制砂价格的10倍。

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浇注式沥青混凝土精细集料的生产一直是沥青混凝土行业的一个难题,港珠澳大桥使用沥青细集料原材料为辉绿岩、石灰岩、花岗岩、玄武岩等,规格为10-30mm。以辉绿岩或玄武岩为例:针对0~2.36mm范围内精细集料的生产也面临同粒径范围的微粉、颗粒相互混合的问题。例如精细骨料的生产需要将不同粒径大小的颗粒与微粉划定为0~0.075mm;0.075~0.212mm、0.212~0.6mm、0.6~2.36mm四类,且误差不能超过10%。规格、比例要求如此精细的成品砂石骨料对设备的要求是极高的。单看筛分规格这组数据, 可知其难度之大!

被忽视的砂子 建筑长寿的秘诀

砂子的问题之所以在港珠澳大桥建设过程中被如此重视,关键还是在于砂子对建筑质量的影响不容忽视

CHUANTONGYIYISHANGRENWEI,SHUINISHIHUNNINGTUZHIBEIGUOCHENGZHONG *ZHONGYAODECAILIAO,CIHUABUJIA,DANHUNNINGTUZUOWEIYIZHONG“KEJIHANLIANG”JIGAODEJIANZHUCAILIAO,XINGNENGYINGXIANGYINSUZHONGDUO,RUSHASHIGULIAOJIPEI、LIXINGYIJIWAIJIAJI、KUANGFENDEYONGLIANG、SHIGONGHEHOUQIYANGHUDENGDENG。

具体到砂子,精品砂不仅仅影响到混凝土的性能,更可以减少水泥和外加剂的使用,减少对矿石、化石能源等不可再生资源的浪费。

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总体而言,混凝土制备是一个宏观和微观并重的系统工程。宏观层面上,应用在不同建筑环节的混凝土需要具备不同的使用性能,在水泥、砂石、外加剂、矿物掺合料等材料的使用上进行不同的搭配;在微观层面上,从小的粉煤灰、水泥再到大一点的砂子、骨料,每一种材料都需要根据混凝土的使用场景进行优化。

微观层面的不足,体现在混凝土宏观层面 是性能的缺陷,进而影响建筑物使用寿命,而砂子在其中扮演了极为重要的作用。

共建生态文明 砂必有为

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有基于此,保障机制砂品质显得尤为重要,尤其是在结构建筑中,高品质砂石的应用是提升建筑物使用寿命的关键。

JINNIANLAI,WULUNSHISHUINIXINGYEHAISHIZHENGGEJIANZHULINGYUDOUZAICHANGDAOLVSEFAZHAN,DANBIXUKANDAODESHI,ZHENZHENGDELVSEFAZHANBUJINJINSHIYUANCAILIAOSHENGCHANGUOCHENGZHONGJIANSHAOZIYUANXIAOHAOHEHUANJINGWURAN,GENGZHONGYAODESHITISHENGJIANZHUZHILIANG,BINGJIANGDIHUNNINGTUZHIBEIGUOCHENGZHONGDUISHUINIDENGGAOWURAN,GAOZIYUANXIAOHAOCHANPINDESHIYONG。

在某种程度上讲,用 *少的资源消耗建设满足不同需求的建筑物,并尽可能延长建筑物使用寿命对建筑行业绿色发展更为重要。


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