Nghiên cứu thiết kế thành phần bê tông hạt nhỏ chất lượng cao chịu mài mòn dùng cho các công trình thuỷ công

NGHIEN Cl/UTHIETKETHANH PHAN BETONG HAT

N H 6 CHAT Ll/ONG CAO CHjU MAI MON DUNG CHO

CAC CONG TRINH THUY CONG

Hoang Van Tan

Pham Hihi Hanh

Nguyen Ngoc Lam

ABSTRACT

Concrete using hydraulic structures

have very high requirements:

Besides the compressive strength

as normal concrete. It requires

other performances: Abrasion

resistance, theology property,

impenetrate.... Concrete of inner

layer of hydraulic constructures

play the role in creating stability,

has been studied carefully

and roller compacted concrete

optimally is used for this

construction. Meanwhile, surface

layer is the protective layer, which

effects to structure durable, is

almost not interested. In this paper,

we present the initial research

into the mix design of corrosion￾resistant fine particles concrete

which contributes more study to

improve construction quality.

PGS. TS Hoang Van Tan

PGS TS. Pham Hiiru Hanh

ThS. Nguyen NgocLam

00:0903263129

Email: hanhphianuce.edu.vn

Trudng Oai hoc Xay dung

M6BAU

Cac edng trinh thuy cdng ngoai eae

yeu cau ve kha nang chju iQc, chdng tham,

dn djnh nhiet thi kha nang chju mai mdn

cung la tinh chat rat dQpc quan tam. DQdi

tac dung mai mdn eua nQdc, dac biet nQdc

ed ap iQc la nguyen nhan lam giam tudi thp

cua eac edng trinh thuy cdng. Trong dd, Idp

ngoai cua cdng trinh thuy edng ( xem ket

eau dac trQng mat cat xa tran cua dap be

tdng nhQ hinh ve 1.1) la chju tac ddng mai

mdn Idn nhat.

ThQc te xay dQng d Viet Nam Idp ldi

dap da dQpc quan tam rat nhieu, hien nay

hieu qua nhat la sQ dung be tdng dam lan;

Trong khi dd Idp ngoai chQa dQpc quan tam

nhieu dac biet la tinh chat chju mai mdn.

Vdi nhiem vu la Idp bao ve nen Idp nay yeu

cau phai cd tinh chat cao nhQng thQdng vdi

kieh thQdc yeu eau khdng can day.

Be dap Qng dQpc cac nhu cau dd ma

van dat dQpc hieu qua ve kinh te thi nen

dung loai be tdng hat nhd chat iQpng cao.

Bai bao nay gidi thieu thiet ke thanh phan

be tdng chat iQpng cao vdi kieh thQdc dang

hat nhd dung lam Idp ngoai cho cac cdng

trinh thuy edng.

Lcjp mat

Ngoai ra loai be tdng nay cung can

iQpng nQdc nhieu hPn de dat dp iQu ddng

can thiet. Viee tang nQdc va ximang cung

dan tdi viec tang dp co ngdt eua be tdng. Vdi

SQ phat then eua khoa hoc ky thuat nhieu

loai vat lieu, phu gia, edng nghe mdi dQpc

ap dung rat hieu qua cho be tdng. Viec thiet

ke thanh phan be tdng chat iQpng cao theo

cdng nghe mdi cho phep giam den mQc tdi

thieu iQpng nQdc va ximang ddng thdi lam

han che den mQc tdi da sQ co ngdt. Vdi sQ

khac phuc hieu qua nay be tdng cdt lieu

nhd se cd nhieu Qu diem khi sQ dung lam

Idp ngoai eho eae cdng trinh thuy edng.

BETONG HAT NH 6 CHjU (VlAl (VION

Hien tQpng mai mdn do nQdc chay la

hien tQpng Idp be mat cua be tdng bj eae

tac ddng lam nhan, mai, va dap cua nQdc.

Qua trinh mai mdn be mat xay ra nhQ so dd

hinh 2.1

Mai mdn la Qng suat ed cQdng dp rat cao

tac ddng cue bd len be mat be tdng, do dd

yeu eau be tdng phai ed CQdng dp va dp cQng

be mat dam bao. Thdng thQdng de dat dp

mai mdn yeu cau phai dat cQdng dp nen tdi

thieu. Be tdng ed cQdng dp rat cao se eho dp

Hinh 1.1 Mat cat xa tran

03.2011 B^^Sfim^l 175