ITS Undergraduate 14384 3106100049 Presentation
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Transcript of ITS Undergraduate 14384 3106100049 Presentation
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PREDIKSI KEKUATAN BETON UMUR 28 HARI PREDIKSI KEKUATAN BETON UMUR 28 HARI
MENGGUNAKAN DATA BETON UMUR MUDA MENGGUNAKAN DATA BETON UMUR MUDA
DENGAN METODE KEMATANGANDENGAN METODE KEMATANGAN
Oleh :
TEGAR JUANG PAMBUDI
3106100049
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overviewoverview
1. Kenapa diperlukan prediksi kuat tekan
beton?
2. Cara prediksi yang bisa digunakan.
3. Teori kematangan “maturity method” (apa
bagaimana, dan kapan digunakan)
4. Bagaimana memprediksi kuat tekan
beton dengan akurat (aplikasi).
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1. Kenapa perlu prediksi?1. Kenapa perlu prediksi?
� Meyakinkan beton mencapai spesifikasi
� Apakah perlu tindakan selanjutnya
� Kontrol kualitas pekerjaan beton (QC)
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2. Cara prediksi yang telah ada2. Cara prediksi yang telah ada
� Menggunakan koefisien PBI 1971
� Metode kematangan
Umur beton 3 7 14 21 28 90 365
Semen portland biasa 0,4 0,65 0,88 0,95 1 1,2 1,35
Semen portland dengan kekuatan
awaltinggi0.55 0,75 0,9 0,95 1 1,15 1,2
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3. “APA” itu kematangan beton?3. “APA” itu kematangan beton?
“beton dengan mix-design dan indeks
kematangan (penggabungan antara
temperatur dan waktu) yang sama akan
memiliki kekuatan yang sama
pula, tidak perduli bagaimanapun
kombinasi temperatur dan waktunya”
Hukum kematangan beton
(Saul, 1951)
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Bagaimana mencatat suhu?Bagaimana mencatat suhu?
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“bagaimana” menghitung indeks “bagaimana” menghitung indeks
kematangan beton?kematangan beton?
� Temperature Time Factor (TTF )
� Equivalent Age (EA)
ASTM C1074-98
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Kapan teori kematangan digunakan?Kapan teori kematangan digunakan?
� Untuk mengetahui kuat tekan beton di
lapangan (in-place concrete)
� Untuk prediksi kuat tekan beton
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4. Memprediksi kuat tekan beton4. Memprediksi kuat tekan beton
� Prediksi 28 hari dari umur 1,2,3,5 dan 7
hari.
� Tahapan prediksi :
1. Pembuatan grafik kematangan beton
(sampel 1)
2. Prediksi kuat tekan (sampel 2)
3. Analisa hasil prediksi
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1. Pembuatan grafik kematangan1. Pembuatan grafik kematangan
� Suhu, waktu, kuat tekan
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Grafik kematangan betonGrafik kematangan beton
1 hari
3 hari7 hari
14 hari28 hari
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Semilog grafik kematangan Semilog grafik kematangan
(untuk mencari (untuk mencari bb))
y = 7,782ln(x) - 38,85R² = 0,990
0,00
5,00
10,00
15,00
20,00
25,00
30,00
35,00
40,00
45,00
100 1000 10000 100000
kuat
tekan r
ata
-rata
, M
pa
kumulatif TTF,°C-h
b = 17,87 MPa
x₁ x₂
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2. Prediksi kuat tekan2. Prediksi kuat tekan
� Nilai b
� Kuat tekan umur awal (Sm)
� Indeks kematangan (m)
� Nilai M
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Rekaman suhu sampel 2Rekaman suhu sampel 2
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Grafik kuat tekan (Sm) vs TTF (m)Grafik kuat tekan (Sm) vs TTF (m)
1 hari
2 hari
3 hari
5 hari
7 hari
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Hasil prediksiHasil prediksi
umur rara-rata kenyataan
beton sensor 1 sensor 2 sensor 3 prediksi 28 hari
1 hari 36,241 36,232 36,413 36,295 3,339 %
2 hari 35,630 35,546 35,841 35,673 1,566 %
3 hari 35,645 35,515 35,841 35,667 1,550 %
5 hari 35,264 35,160 35,479 35,301 0,509 %
7 hari 35,354 35,231 35,567 35,384 0,745 %
besar perbedaan (%)
prediksi dan kenyataan
prediksi oleh
35,123
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Analisa hasil prediksi (uji hipotesis)Analisa hasil prediksi (uji hipotesis)
� H₀ : nilai kuat tekan rata-rata prediksi sama dengan rata-rata
kuat tekan aktual umur 28 hari.
� Ha: nilai kuat tekan rata-rata prediksi tidak sama dengan rata-
rata kuat tekan aktual umur 28 hari.
nilai t = 19,907 nilai t = 6,260 nilai t = 5,741 nilai t = 1,895 nilai t = 2,659
nilai p = 0,003 nilai p = 0,025 nilai p = 0,029 nilai p = 0,199 nilai p = 0,117
t tabel = 4,303α = 5%
t tabel = 2,920
α = 10%
t tabel = 2,280α = 15%
t tabel = 1,886α = 20%
syarat penolakan Ha: 1. bila nilai p > α
2. bila nilai t hitung < t tabel
terima Ha
terima Ha
tolak Ha
tolak Ha
terima Haterima Ha
terima Ha
terima Ha
terima Ha
terima Ha
tolak Ha
tolak Ha
tolak Ha
tolak Ha
tolak Ha
tolak Ha
tolak Hatolak Ha
terima Ha
terima Ha
terima Ha
terima Ha
terima Haterima Ha
prediksi dari hari ke
95%
90%
85%
80%
1 hari 2 hari 3 hari 5 hari 7 hari
terima Ha
terima Ha
terima Ha
terima Ha
terima Haterima Ha
co
nv
ide
nc
e i
nte
rva
lterima Ha
terima Ha
terima Ha
terima Ha
terima Ha
terima Ha
terima Ha
terima Ha
terima Haterima Ha
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kesimpulankesimpulan
� Metode kematangan dapat diterapkan
dengan baik untuk prediksi kuat tekan
beton normal.
� prediksi akurat jika dilakukan pada umur
beton 5 hari atau setelahnya, dengan
selisih kurang dari 1% dari kuat tekan
akutual.
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